roots international No. 1, 2014
Cover
/ Editorial
/ Content
/ Mineral trioxide aggregate revisited: A cement for all seasons
/ Apexification withmineral trioxide aggregate (MTA): A case report
/ “A” sequence of irrigation
/ PHAST PIPS: The photoacoustic wave of the future?
/ Fifth-generation technology in endodontics: The shaping movement
/ The rationale and use of electronic apex locators
/ Apex locator more precise than CBCT
/ New endodontic imaging mode from Planmeca yields detailed imageswithout noise or artefacts
/ AmericanAssociation of Endodontists organised Root Canal AwarenessWeek for the seventh time
/ International events
/ Submission guidelines
/ Imprint
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[1] =>
Vol. 10 • Issue 1/2014
issn 2193-4673
roots
international magazine of
endodontology
1
2014
| CE article
Mineral trioxide aggregate revisited:
A cement for all seasons
| special
“A” sequence of irrigation
| technique
Fifth-generation technology in endodontics:
The shaping movement
[2] =>
Dental Tribune International
The World’s Largest News and
Educational Network in Dentistry
www.dental-tribune.com
[3] =>
editorial _ roots
I
Where we have been, where we
are and where we are going?
Is “Big Brother” watching us?
_The future of endodontics is bright and holds incredible promise as we continue to develop
new techniques and technologies that will allow us to perform endodontic treatment painlessly and
predictably. For the past 100 years the objective of dentistry has always been and always should be to
maintain the natural dentition wherever possible. And the objective of endodontic treatment has never
wavered since root canal treatment was first performed; that being to prevent or treat apical periodontitis such that there is complete healing and an absence of infection, while the overall long-term goal is
the placement of a definitive, clinically successful restoration and preservation of the tooth. With the
emergence of exciting technologies, clinical endodontics is seeing higher successes never seen before.
Dr Gary Glassman
The Dental Operating Microscope (DOM), and ultrasonics instruments have allowed us to locate
canals with surgical precision while allowing maximum conservation of tooth structure. The design and
metallurgy of nickel titanium files (NiTi files) with its super elastic characteristics allow better maintenance of the original canal anatomy, while the motion, rotary, reciprocation, or a combination of both
produce less extrusion of debris, increased resistance to cyclic fatigue, allow greater cutting efficiency
and reduced time for canal shaping compared to stainless steel files.
Mineral trioxide aggregate (MTA) has been and continues to be a remarkable and biocompatible
restorative material that has become the standard for pulp capping and root perforation, and has
salvaged countless teeth that previously had been considered hopeless.
Methods to improve disinfection in the root canal system has been the focus of perhaps the greatest
international attention in endodontics. Better root canal disinfection may lead to even greater endodontic successes!
But perhaps the greatest boon to our profession and a pivotal tool in the practice of endodontics is
the use of cone beam computed tomography (CBCT). Interpretation of a two-dimensional image of a
three-dimensional object can make the interpretation of radiolucencies, complex dental anatomy and
surrounding anatomic structures very difficult. CBCT technology, with its three dimensional rendering
ability has allowed detection rates of root canal anatomy and detection of periradicular pathology to
be dramatically increased. Although the detection of vertical root fractures is difficult at best with both
conventional radiology and CBCT, CBCT has been shown to be an excellent supplement to conventional
radiography in the diagnosis of root fractures. The differentiation between internal and external resorption; location and size, has allowed diagnosis and subsequent treatment to be more decisive and
predictable. Unnecessary investigative treatment may be avoided now that three dimensional evaluation of these ‘lesions’ can be achieved. The same pertains to the precise nature of a perforation and the
role that CBCT plays on its subsequent treatment. Post operative healing can be monitored more accurately with CBCT due to its superior resolution compared to conventional radiology and more ‘informed’
decisions can be made with respect to treatment planning.
Will the information that the CBCT provides force the clinician to exhaust all efforts to find all the
canals and subsequently address the anatomy? Will it force the clinician to elevate their efforts to provide a better debrided canal and a more thorough obturation? Is “Big Brother” watching? I believe the
answer to all of the above is YES!!
Dr Gary Glassman
Doctor of Dental Surgery
Fellow of Royal College of Dentists of Canada
roots
1
I 03
_ 2014
[4] =>
I content _ roots
page 6
I editorial
03
page 14
30
Where we have been, where we are and where we are going?
Is “Big Brother” watching us?
| Dr Gary Glassman
I industry news
I CE article
Mineral trioxide aggregate revisited:
A cement for all seasons
36
I events
Apexification with mineral trioxide aggregate (MTA):
A case report
38
| Dr Abu-Hussein Muhamad, Drs Abdulghani Azzaldeen &
Abu-Shilabayeh Hanali
“A” sequence of irrigation
| Dr Philippe Sleiman
International Events
I about the publisher
41
42
| submission guidelines
| imprint
PHAST PIPS: The photoacoustic wave of the future?
| Dr Reid Pullen
I technique
22
American Association of Endodontists organised
Root Canal Awareness Week for the seventh time
| AAE
40
I special
18
New endodontic imaging mode from Planmeca fields
detailed images without noise or artefacts
| Planmeca
I case report
14
Apex locator more precise than CBCT
| VDW
| Dr Gary Glassman
10
The rationale and use of electronic apex locators
| Dr L. Stephen Buchanan
34
06
page 22
Fifth-generation technology in endodontics:
The shaping movement
| Drs Clifford J. Ruddle, John D. West & Pierre Machtou
page 30
04 I roots
1_ 2014
Cover image: frontal and lateral views of a 3-D reconstruction
of a maxillary first premolar showing a three-rooted canal system.
This micro-CT image was developed as part of the Root Canal
Anatomy Project http://rootcanalanatomy.blogspot.com in the
Laboratory of Endodontics of the University of São Paulo in
Ribeirao Preto, Brazil by Prof. Marco Versiani, Prof. Jesus Pécora
& Prof. Manoel Sousa-Neto
page 36
page 40
[5] =>
[6] =>
I CE article _ use of MTA
Mineral trioxide
aggregate revisited:
A cement for all seasons
Author_ Dr Gary Glassman, Canada
roots
_ce credit
This article qualifies for CE credit. To take the CE quiz, log on to
www.dtstudyclub.com. Click on ‘CE articles’ and search for this
edition of the magazine. If you are not registered with the site,
you will be asked to do so before taking the quiz. You may also
access the quiz by using the QR code.
_Pulpal and periradicular pathology develop
when the dental pulp and periradicular tissues become exposed to microorganisms. In experimental,
germ-free conditions, pulpal and periradicular tissues
fail to show the development of pathosis and associated lesions when exposed to bacteria.1,2 The conclusion: microorganisms are the main irritants of the
dental pulp and periodontium, and sealing the pathways of communication between the root canal system and the periradicular tissues is imperative if bacterial leakage is to be prevented.
Fig. 1_MTA Angelus (Angelus,
Londrina, Brazil) available in
resealable vials.
Fig. 1
An ideal orthograde or retrograde filling material
that seals the pathways of communication between
the root canal system and its surrounding tissues
should be non-toxic, non-carcinogenic, biocompatible, insoluble in tissue fluids and dimensionally
stable.3, 4 Furthermore, the presence of moisture
should not affect its sealing ability; it should be easy
to use and be radiopaque for recognition on radiographs.4
Because existing restorative materials used in
endodontics did not possess these “ideal” characteristics,4 mineral trioxide aggregate (MTA) was developed and recommended initially as a root-end filling
material and subsequently has been used for pulp
capping, pulpotomy, apexogenesis, apical barrier
formation in teeth with open apexes, repair of root
perforations and, most recently, in revascularization
cases. MTA has been recognized as a bioactive material.5,6
MTA has been shown to seal off the pathways of
communication between the root canal system and
surrounding tissues, significantly reducing bacterial
migration.7 It is made up of fine hydrophilic particles
that set in the presence of water, and it is composed
of tricalcium silicate, dicalcium silicate, tricalcium
aluminate, tetracalcium aluminoferrite, calcium sulfate dihydrate (gypsum) and bismuth oxide, which
provides it with radiopacity.8
Portland cement is the most common type of cement in general use around the world, used as a basic ingredient of concrete, mortar, stucco and most
non-specialty grout. It usually originates from limestone. MTA is available as Gray MTA and White MTA.
The crystalline structure and chemical composition
of Gray and White MTA are similar, except for the
presence of iron in Gray MTA. Both contain bismuth
06 I roots
1_ 2014
[7] =>
CE article _ use of MTA
I
oxide and calcium silicate oxide. Portland cement is
composed mainly of calcium silicate oxide and does
not contain bismuth oxide but does contain potassium. Calcium oxide is added in both Angelus White
and Gray MTA (Angelus, Londrina, Brazil) to reduce
the setting time, which is too long in MTA cements of
other brands (Fig. 1).
MTA has a similar mechanism of action to calcium
hydroxide9 in that the main component of the material, calcium oxide, when in contact with a humid
environment, is converted into calcium hydroxide.10
This results in a high pH of 12.5, making its surroundings inhospitable for bacterial growth and producing
an antibacterial effect for a long period of time. But
unlike calcium hydroxide products, such as Dycal
(DENTSPLY, USA) and MTA Angelus (Angelus, Brazil), it
has very low solubility, so it maintains a hard, excellent marginal seal.
Finally, unlike most dental materials, MTA actually
needs moisture to set, so it thrives in a moist environment. Of the commercially available MTA products, MTA Angelus is well suited for most of the indicated endodontic procedures due to its setting time
of 10 minutes, compared with the four-hour setting
time of the other commercially available MTA. It is also
packaged in air-tight bottles, allowing the practitioner to use only what is exactly needed, without introducing undue moisture into the remainder and
without waste.11
Fig. 2
_Endodontic revascularization
Treatment of the immature, non-vital tooth with
apical pathology presents several challenges. The
mechanical cleaning and shaping of such a tooth with
a blunderbuss canal is difficult, if not impossible, to
achieve predictably. The thin, fragile lateral dentinal
walls can fracture during mechanical filing, and the
large volume of necrotic debris contained in a wide
root canal is difficult to completely disinfect.12
Fig. 2_Radiograph of a necrotic
lower left second premolar with
large periradicular radiolucency
with an incompletely formed root,
both longitudinally and laterally.
A new technique is presented to revascularize immature permanent teeth with apical periodontitis.
The canal is disinfected with copious irrigation and a
Fig. 3a–d_EndoVac apical negative
pressure delivery system
(Axis/SybronEndo, USA).
Fig. 3a
Fig. 3b
Fig. 3c
Fig. 3d
roots
1
I 07
_ 2014
[8] =>
I CE article _ use of MTA
Fig. 4_After the triple antibiotic
paste was inserted into the canal,
a temporary restoration was placed.
Fig. 5_Blood clot was induced and
MTA Angelus (Angelus, Brazil) was
placed over top and then the tooth
was restored with bonded composite.
Fig. 4
Fig. 5
combination of three antibiotics. After the disinfection protocol is complete, the apex is mechanically irritated to initiate bleeding into the canal to produce a
blood clot to the level of the cementoenamel junction.
An access cavity was made, purulent hemorrhagic
drainage obtained, and the necrotic nature of the pulp
confirmed. The root canal was slowly flushed with 20ml
of 5.25 per cent NaOCl for 15 minutes. It was delivered
with the master delivery tip and the macro canulae of
the EndoVac apical negative pressure delivery system
(Axis/SybronEndo, USA) (Fig. 3). The canal was dried with
paper points, and a mixture of ciprofloxacin, metronidazole and minocycline paste as described by Hoshino
et al.17 was prepared into a creamy consistency and spun
down the canal with a lentulo spiral instrument to a
depth of 8mm into the canal. The access cavity was
closed with a sterile cotton pellet placed in the chamber
and blue Cosmecore (Cosmedent, USA) (Fig. 4).
A double seal of the coronal access is then made,
first with MTA over the blood clot and then a bonded
composite. The combination of a disinfected canal, a
matrix into which new tissue could grow, and an effective coronal seal appears to have the ability to produce
an environment necessary for successful revascularization.13 The development of normal, sterile granulation tissue within the root canal is thought to aid in
revascularization and stimulation of cementoblasts or
the undifferentiated mesenchymal cells at the periapex, leading to the deposition of a calcific material at
the apex as well as on the lateral dentinal walls.12
_A case of mistaken identity
A 15-year-old girl of Asian descent was referred to
the author’s private endodontic clinic for evaluation
on the lower left second premolar. The healthy young
patient with an unremarkable medical history presented with a history of buccal swelling of the left
mandibular area and discomfort to direct pressure on
the tooth.
On clinical examination, the patient was asymptomatic, and the tooth appeared intact, without caries.
The presence of an enamel pearl on tooth #45 suggested that one may have been present on this tooth,
which was fractured during function, resulting in a
microexposure and necrosis of the pulp. The tooth
had an open apex associated with a large radiolucency (Fig. 2). Periodontal probings were within normal limits for all teeth in the lower left region. Diagnostic testing was negative to cold and electric pulp
testing, with mild sensitivity on percussion and palpation. Because of the presence of a wider than 4 mm
open apex and thin dentinal walls prone to possible
future fracture,14 it was felt that an attempt to achieve
regeneration of the pulp should be made by a technique similar to that described by Rule and Winter15
and Iwaya et al.16
08 I roots
1_ 2014
The patient returned three weeks later and was
asymptomatic. The access was opened and the canal
again flushed with 20 ml of 5.25 per cent NaOCl for
15 minutes. It was delivered in the same manner as
in the first visit with the master delivery tip and the
macro canulae of the EndoVac apical negative pressure delivery system. The canal appeared clean and
dry, with no signs of inflammatory exudate. A #30
K-file was introduced into the canal until vital tissue
was felt at a depth of 10mm into the canal space. It
was used to irritate the tissue gently to create some
bleeding into the canal. The bleeding was stopped at
a level of 5mm below the level of the CEJ and left for
30 minutes, so that the blood would clot at that level.
After 30 minutes, the presence of the blood clot to
approximately 5 mm apical of the CEJ was confirmed.
White mineral trioxide aggregate, MTA Angelus was
carefully placed over the blood clot and allowed to set
for 20 minutes. After confirmation was achieved of its
set, a bonded composite was placed and the patient
was scheduled for follow-up in three months. Unfortunately, the MTA was placed further apically then
would have been preferred (Fig. 5).
At the three-month follow-up appointment, the
patient was totally asymptomatic, and the radiograph showed complete resolution of the radiolucency, with closure of the apex and thickening of the
dentinal walls. Pulp testing was inconclusive (Fig. 6).
[9] =>
CE article _ use of MTA
I
Fig. 6_Three-month recall reveals
excellent longitudinal apical and
lateral dentin development.
Fig. 7_One-year recall radiograph
reveals that definitive endodontics
had been completed by the patient’s
new dentist.
Fig. 6
Fig. 7
At the one-year follow-up appointment, the radiograph revealed that treatment had been performed
on this tooth by another dentist, different from her
original dentist who made the initial referral. The new
dentist, not familiar with revascularization treatment
performed, had entered the root canal space, cleaned
it out and obturated it with gutta-percha and sealer.
Fortunately, the treatment was successful (Fig. 7).
9. Arnaldo Castellucci, MD, DDS. The Use of Mineral Trioxide
Aggregate in Clinical and Surgical Endodontics. Dentistry
Today, March 2003.
10. Duarte MA, Demarchi AC, Yamashita JC, Kuga MC, Fraga Sde
C. pH and calcium ion release of 2 root-end filling materials.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2003
Mar;95(3):345–347.
11. Boksman L, DDS, Friedman M, MTA: The New Material of Choice
for Pulp Capping, Oral Health Dental Journal August 2011.
12. Shah N, Logani A, Bhaskar U, Aggarwal V, Efficacy of Revascularization to Induce Apexification/Apexogensis in Infected,
Nonvital,Immature Teeth: A Pilot Clinical Study JEndo, Volume
34, Number 8, August 2008 pp 919–924.
13. Banchs F, Trope M, Revascularization of Immature Permanent Teeth With Apical Periodontitis: New Treatment Protocol?
J EndoVol. 30, No. 4, April 2004 pp 196–200.
14. Cvek M. Prognosis of luxated non-vital maxillary incisors
treated with Endod Dent Traumatol 1992;8:45–55.
15. Rule DC, Winter GB. Root growth and apical repair subsequent
to pulpal necrosis in children. Br Dent J 1966;120:586–590.
16. Iwaya S, Ikawa M, Kubota M. Revascularization of an immature
permanent tooth with apical periodontitis and sinus tract. Dent
Traumatol 2001;17:185–187.
17. Hoshino E, Kurihara-Ando N, Sato I, et al. In-vitro antibacterial
susceptibility of bacteria taken from infected root dentine to a
mixture of ciprofloxacin, metronidazole and minocycline. Int
Endod J 1996;29:125–130.
_Conclusion
The future of endodontics is bright as we continue
to develop new techniques and technologies that will
allow us to perform treatment painlessly and predictably and continue to satisfy one of the main objectives in dentistry, that being to retain the natural
dentition wherever possible and wherever practical._
_References
1. Kakehashi S, Stanley HR, Fitzgerald RJ. The effects of surgical
exposures of dental pulps in germ-free and conventional
laboratory rats. Oral Surg Oral Med Oral Pathol 1965; 20;
340–349.
2. Moller AJR, Fabricius L Dahlen G, Ohman A, Heyden G. Influence of periapical tissues of indigenous oral bacterial and
necrotic pulp tissue in monkeys. Scand J Dent Res 1981; 89;
475–484.
3. Torabinejad M, Pitt Ford TR. Root end filling materials: a review.
Endod Dent Traumatol1996;12:161–178.
4. Ribeiro DA. Do endodontic compounds induce genetic damage? A comprehensive review. Oral Surg Oral Med Oral Pathol
Oral Radiol Endod 2008;105:251–256.
5. Enkel B, Dupas C, Armengol V, et al. Bioactive materials in
endodontics. Expert Rev Med Devices 2008;5:475–494. That
is hard tissue conductive (7).
6. Moretton TR, Brown CE Jr, Legan JJ, Kafrawy AH. Tissue
reactions after subcutaneous and intraosseous implantation
of mineral trioxide aggregate and ethoxybenzoic acid cement.
J Biomed Mater Res 2000;52:528–533., hard tissue inductive, and biocompatible.
7. Torabinejad M, Hong OU, Pitt Ford TR. Physical properties of a
new root end filling material. J Endodon 1995; 21; 349–353.
8. Dentsply Tulsa Dental. ProRootTM MTA Root canal repair material; Material safety data sheet (MSDS).
_about the author
roots
Gary D. Glassman, DDS, FRCD(C), graduated from the University of Toronto, Faculty of Dentistry in 1984; and graduated
from the Endodontology Program at Temple University in
1987, where he received the Louis I. Grossman Study Club
Award for academic and clinical proficiency in endodontics.
The author of numerous publications, Glassman lectures
globally on endodontics, is on staff at the University of Toronto,
Faculty of Dentistry, in the graduate department of endodontics,
and is adjunct professor of dentistry and director of endodontic
programming for the University of Technology, Jamaica. He is a fellow of the Royal
College of Dentists of Canada and the endodontic editor for Oral Health dental journal.
He maintains a private practice, Endodontic Specialists, in Toronto, Ontario, Canada.
He can be reached through his website, www.rootcanals.ca
roots
I 09
1
_ 2014
[10] =>
I case report _ use of MTA
Apexification with mineral
trioxide aggregate (MTA):
A case report
Authors_ Dr Abu-Hussein Muhamad, Greece; Drs Abdulghani Azzaldeen & Abu-Shilabayeh Hanali, Jerusalem
_Abstract
_Introduction
Mineral trioxide aggregate (MTA) was introduced
as an alternative to traditional materials for the repair
of root perforations and pulp capping and as a retrograde root filling owing to its superior biocompatibility and ability to seal the root canal system. Traditionally, calcium hydroxide (Ca(OH)2) has been the material of choice for the apexification of immature permanent teeth but MTA holds significant promise as an
alternative to multiple treatments with Ca(OH)2. This
paper discusses the use of Ca(OH)2 as a traditional
apexification material and provides an overview of
the composition, properties and applications of MTA
with emphasis on its use in the apexification of immature permanent teeth. A case report is presented to
demonstrate its use.
Trauma causes cessation of root development and
fragile root canals become weak, making it difficult to
create an artificial barrier or induce closure of apical
foramina with calcified tissue.1 MTA was first described in dental scientific literature in 1993,2 and was
given approval for endodontic use by the US Food and
Drug Administration in 1998. Up to 2002, only one
MTA material, consisting of grey-coloured powder,
was available and then white MTA was introduced.
Both formulae contain 75% Portland cement, 20%
bismuth oxide and 5% gypsum by weight.
The aim of apexification is the production of mineralised apical tissue and to limit bacterial infection in
immature anterior tooth. The inadequacy of Ca(OH)2
Fig. 1
Fig. 2
Fig. 1_Radiographic examination
found involvement of the pulpal
tissue and the presence of periapical
lesions due to dental trauma.
Fig. 2_The first attempt to place MTA
in the right maxillary central incisor
(tooth 11).
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[11] =>
case report _ use of MTA
I
Fig. 3_The apical plug of MTA in the
apical third of the canal.
Fig. 4_Conventional obturation with
gutta-percha.
Fig. 3
Fig. 4
apexification owing to the need for multiple visits for
refreshment and reinfection because of its temporary
seal3, 4 led to the use of MTA, which forms a barrier and
prevents microleakage. It is biocompatible and facilitates the formation of dentinal bridges and cementum, and regeneration of the periodontal ligament.5
It has the ability to stimulate cytokine release from the
bone cells, indicating that it actively promotes hardtissue formation.6
radiology) were performed through which it was
established that the left and right maxillary central
incisors were in normal position with enamel–dentine fracture. The root canals were wide, the roots incompletely formed with open apices and there were
periapical lesions (Fig. 1). Cleaning and shaping of
the root canal system was achieved under rubber
dam isolation. The solution used for irrigation was
2.5% sodium hypochlorite. Root canal length was
determined using an apex locator and confirmed radiographically. Ca(OH)2 paste was placed in the canals
for one week for disinfection. During the second appointment, Ca(OH)2 was removed by mechanical instrumentation and flushed from the root canals by
means of sterile water irrigation. The canals were
dried using sterile paper points. MTA was prepared
immediately before use, placed into the canals with
an MTA carrier and compacted with a hand plugger
to create an apical plug of 3 to 4mm in accordance
with the manufacturer’s instructions. A radiograph
was taken to check whether any apical extrusion had
occurred.
_Case report
A 14-year-old female patient suffering from
painful symptoms caused by her maxillary central incisors was examined in the Department of Pediatic
Dentistry and Orthodontics of Al-Quds University in
Jerusalem for evaluation and treatment.
Investigation revealed a trauma four years before
associated with an enamel–dentine fracture. No treatment had been performed at that time. Approximately
two years later, a fluctuant swelling developed in the
apical area of the teeth. Symptoms also included tenderness to percussion. Drainage was established by
lingual access in the pulp chamber. Treatment was interrupted by the patient for no reason and, four years
later, an attempt at apexification using Ca(OH)2 paste
was carried out for six months by another dentist, but
no apexification was observed for either tooth.
The apical plug failed in the first attempt on the
right maxillary central incisor (Fig. 2). The MTA was
rinsed out with sterile water and the procedure was
repeated (Fig. 3). Moist paper points were placed in
the canals and the access cavities were closed with a
temporary restorative material, IRM (DENTSPLY).
When the patient was referred to our department, extra- and intra-oral examinations (including
Two days later, the coronal and middle thirds of the
canals were filled with gutta-percha by a vertical
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[12] =>
I case report _ use of MTA
Fig. 5_Radiographic
follow-up at six months.
Fig. 6_Radiographic
follow-up at 12 months.
Fig. 5
Fig. 6
warm compaction technique and the access cavities
were sealed in conjunction with the final restoration
(Fig. 4). Periradicular healing was assessed clinically
and radiographically at six, eight and 12 months
(Figs. 5 & 6). The use of MTA followed by conventional
endodontic treatment resulted in apical formation
in the two central incisors (Fig. 6).
calcium phosphate ceramic was developed. Koenigs,
Brilliant and Driskell9 found that use of this material
induced apical closure in vital teeth of primates with
open apices. Regeneration of the periodontal ligament occurred around the apices of teeth and it was
associated with minimal inflammatory response. Herbertdocumented the long-term success of using a tricalcium phosphate plug as an apical barrier for onevisit apexification. In other studies, teeth with open
apices were obturated using an apical barrier with
dentine and Ca(OH)2 plugs or dentine chips and hydroxyapatite.10
_Discussion
The traditional use of Ca(OH)2 apical barriers has
been associated with unpredictable apical closure,
extended time taken for barrier formation, difficulties
in patient compliance, and the risk of reinfection resulting from the difficulty in creating long-term seals
with provisional restorations and susceptibility to
root fractures arising from the presence of thin roots
or prolonged exposure of the root dentine to Ca(OH)2.7
Thus, the one-visit apexification technique is gaining
popularity. One-visit apexification has been defined
as the non-surgical condensation of a biocompatible
material into the apical end of a root canal. The rationale is to establish an apical stop that would enable
the root canal to be filled immediately. Torneck et al.8
found that when apical closure takes place clinically
with Ca(OH)2, there is incomplete bridging of the
apex histologically. Periapical inflammation persists
around the apices of many teeth because necrotic tissue exists in the corners and crevices of the bridge.
A major target area of biomedical research is the
restoration of lost bone. To this end, a resorbable tri-
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There is increasing popularity of the one-visit apexification technique using MTA as an osteoconductive
apical barrier. MTA is relatively non-cytotoxic and
stimulates cementogenesis. This material generates a
highly alkaline aqueous environment by leaching of
calcium and hydroxyl ions, rendering it bioactive by
forming hydroxyapatite in the presence of phosphatecontaining fluids. Unlike the extended use of Ca(OH)2
in immature roots, prolonged filling of these roots
with MTA did not reduce their fracture resistance.11
Torabinejad12 reported the ingredients in MTA as
tricalcium silicate, tricalcium aluminate, tricalcium
oxide and silicate oxide with some other mineral oxides that were responsible for the chemical and physical properties of aggregate. The powder consists of
fine hydrophilic particles that set in the presence of
moisture. The hydration of the powder results in a colloidal gel with a pH of 12.5 that will set in approxi-
[13] =>
case report _ use of MTA
mately 3 hours. MTA has a compressive strength equal
to intermediate restorative material and SuperEBA
(Bosworth) but less than that of amalgam. It is commercially available as ProRoot MTA (DENTSPLY), and
has been advocated for use in the immediate obturation of an open root apex.
MTA has the ability to induce cementum-like hard
tissue when used adjacent to the periradicular tissue.
MTA is a promising material as a result of its superior
sealing property, its ability to set in the presence of
blood and its biocompatibility. Moisture contamination at the apex of tooth before barrier formation is
often a problem with other materials used in apexification. As a result of its hydrophilic property, the presence of moisture does not affect its sealing ability.
Shabahang et al13 examined hard-tissue formation
and inflammation histomorphologically after treating open apices in canine teeth with osteogenic protein-1, MTA and Ca(OH)2. MTA induced hard-tissue
formation with the most consistency, but the amount
of hard-tissue formation and inflammation was not
statistically different among the three materials.
MTA has demonstrated the ability to stimulate
cells to differentiate into cells that form hard tissue
and to produce a hard-tissue matrix. A number of animal studies have demonstrated a more predictable
healing outcome when MTA is used compared with
teeth treated with Ca(OH)2.14 In a prospective human
outcome study, 57 teeth with open apices were obturated with MTA in one appointment. Forty-three of
these cases were available for recall at 12 months, of
which 81% of cases were classified as healed.15
Despite its good physical and biological properties,
its extended setting time has been a disadvantage.
Calcium chloride has been used to stimulate the
hardening process of MTA and studies have shown
that both its physico-chemical properties and sealing ability were improved by the addition of calcium
chloride.
_Conclusions
Based on this study’s results, the following conclusions can be made:
_MTA showed clinical and radiographic success as
a material used to induce apical closure in necrotic
immature permanent teeth.
_MTA is a suitable replacement for Ca(OH)2 for the
apexification procedure._
_authors
I
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Abu-Hussein Muhamad,
DDS, MScD, MSc, DPD, is
a visiting clinical professor
at the University of Naples
Federico II in Italy.
Abdulghani Azzaldeen,
DDS, PhD, is an assistant
professor at Al-Quds University.
Abu-Shilabayeh Hanali,
DDS, MSc, is a lecturer at
Al-Quds University.
_contact
Dr Abu-Hussein
Muhamad
123 Argus St.
10441 Athens, Greece
abuhusseinmuhamad@
gmail.com
AD
Biological &
Conservative
FKG Dentaire SA
www.fkg.ch
[14] =>
I special _ root canal disinfection
“A” sequence of irrigation
Author_ Dr Philippe Sleiman, Lebanon
ond one is mechanical. It is the chemical preparation
that will be discussed in the scope of this article.
Fig. 1_EndoVac system.
Fig. 1
_During the last several years, endodontics has
progressed to the point where treatment has become less traumatic for the patient and less stressful for the dentist. While the use of nickel-titanium
rotary instruments has allowed us to gain time during endodontic treatment, it can tempt us to neglect
one of the main objectives of endodontics, that is
the cleaning, or the chemical preparation, of the
root canal system—we need to be clear on whether
we are treating a canal or a root canal system. The
main goal of root canal treatment is to completely
eliminate the various components of the pulpal tissue, calcification and bacteria; to place a hermetic
seal to prevent infection or reinfection; and to promote healing of the surrounding tissues, if needed.
There are many root canal preparation sequences available, such as crown-down, step-back
and modified step-back. There are also many techniques for filling the root canal system, such as vertical compaction of warm gutta-percha, System B
(SybronEndo) and lateral condensation. But do we
have a protocol or a sequence for irrigation? In 2005,
my irrigation protocol suggestions were published
in an article in the Oral Health journal, and what follows here is an update thereof.
We must ask ourselves why we irrigate, and what
irrigation protocol will provide the cleanest canal. In
this context, let us remember that shaping is the result of endodontic instruments opening the space
of lesser resistance, or what it is more commonly referred to as the main canal, while the cleaning results from irrigation. Therefore, there are two types
of preparation. The first one is chemical and the sec-
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It has been proven that there is a close correlation between these two types of preparation. In fact,
apical preparation with a larger tip size and smaller
taper, for instance ISO size 35.04 can help to reduce
the level of colony-forming units dramatically compared with apical preparation of tip size 25.06. This
outcome confirms that by performing a larger tip
size apical preparation we can disrupt the biofilm
mechanically, thus facilitating the work for the
chemicals. Also, such apical preparation will allow
for a greater quantity and stable concentration of
the irrigating solution, which will therefore better
eliminate the organic component and the smear
layer from the root canal system walls. The files can
clean only parts of the root canal system. They create a reservoir that can hold various irrigating solutions that will access and clean portions of the root
canal system, which the instruments cannot reach.
The access cavity, having four walls, will create a
reservoir for the irrigating solutions to be frequently
and continuously refreshed, which can be done
safely with the EndoVac system (SybronEndo; Fig. 1)
using the Master Delivery Tip for 20 to 30 seconds
each time.
In endodontics, the most commonly used irrigating solution is sodium hypochlorite (NaOCl). It has
many desirable qualities and properties. It has bactericidal cytotoxicity characteristics and it dissolves
organic matter, while providing minor lubrication.
However, NaOCl alone is not sufficient for complete
cleaning of the root canal system. NaOCl has no effect on the smear layer and its high surface tension
does not allow it to clean and disinfect the totality
of the root canal system. For this reason, and depending on the specific clinical situation, one has to
use other irrigants in combination with NaOCl.
The various irrigants that can be used consecutively
and according to the clinical situation are as follows:
_17% EDTA (SmearClear, SybronEndo);
_0.2% chlorhexidine;
_5.25% NaOCl;
_50% citric acid; and
_distilled water.
[15] =>
special _ root canal disinfection
I
Fig. 2_SM1 file and SmearClear
(Sybron Endo).
Fig. 2
In general, after preparing the access cavity, an
endodontic file is introduced into the root canal.
However, when a file is introduced immediately, it
spreads bacterial toxins into the root canal system
and into the periapical area, which will negatively
affect the prognosis of the endodontic treatment
owing to the likelihood of a post-operative flare-up.
The breakdown and the accumulation of the pulp
tissue and its collagen during the initial file penetration may, from the very beginning, create an organic
plug within the root canal.
bacteria and the smear layer produced during canal
enlargement. We suggest beginning the treatment
with 30-second irrigation with NaOCl via the Master
Delivery Tip to destroy the majority of the pulp tissue
inside the access cavity and provide a better view of
the canal orifices by controlling bleeding and preventing any collagen plugs from forming. Also, chemical interaction between NaOCl and collagen can help
us detect the presence of canals by observing the gas
bubbles coming out from the orifice into the access
cavity.
_Irrigation sequence during root canal
treatment of a vital tooth
A second application of NaOCl and its activation
is performed with a K-file (size 8 or 10). This will disorganise the pulpal tissue in both the cervical and
middle thirds of the root canal. The M4 handpiece
(SybronEndo), with its reciprocating movement of
30 degrees, on the Elements motor can be a great tool
In this clinical situation, we have to face the challenge of treating the complexity of the different components of the pulp, and eventually the presence of
Figs. 3a & b_Case 1: Treatment of a
maxillary second molar. The patient
was referred, since only two canals
had been found and the tooth was
still symptomatic. It took some time
to find the third canal, which shared
the same orifice but split off deeper
inside (a). The post-op X-ray shows
the isthmus filled between those two
canals and a lateral exit in the middle
of the palatal root that was causing
an external infection (b).
Fig. 3a
Fig. 3b
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I special _ root canal disinfection
Fig. 4a
Fig. 4b
Figs. 4a & b_Case 2: The patient
was referred to establish whether it
was possible to save the molar (a).
As no crack was found, a single-visit
treatment was performed, and the
six-month follow-up found good
healing (b).
for creating a space of lesser resistance in the root
canal system, agitating the NaOCl inside it in order to
promote chemical interaction and helping dissolve
the organic components.
Once the preparation of the canal has begun,
with the use of the SM1 file (Fig. 2), or any rotary file,
SmearClear (17% EDTA, cetrimide and surfactants)
must be used. EDTA is an organic acid that eliminates
the mineral component, or the smear layer, formed
during the root canal enlargement. The greatest
amount of smear layer is produced during the use of
rotary files. A surface tension inhibitor will allow for
better contact with the dentine and, hence, for a
higher efficiency of the product.
It is advised to alternate between EDTA and
NaOCl from the beginning of the preparation in order
to eliminate the mineral layer before it thickens and
becomes condensed inside the canal system, closing
access to lateral and accessory canals and dentinal
tubules, which would altogether mean that by the end
of the preparation the system would be blocked with
only the main canal open. I like to compare this technique to cleaning out the snow during a week-long
snowstorm: if we do not clean the snow from our door
daily, we will be blocked off inside by the end of the
storm and it will take a great deal of effort to remove
the snow afterwards to open the door.
Ultrasonic activation of the irrigating solution
with a small-diameter file is recommended for more
efficient chemical preparation. However, we need to
ensure that the tip stays at least 5mm away from the
working length to avoid pushing any chemical outside the root canal and into the periodontal ligament
and supporting bone. Each time a rotary file is used,
an irrigating solution must be present inside the
canal, and this should be EDTA. The use of EDTA early
in the sequence facilitates the flow of the other irrigants, especially NaOCl or chlorhexidine, into the lat-
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eral canals, isthmuses and the whole root canal system, allowing for proper chemical preparation of the
root canal system. Also, 17% EDTA plays an important
role in the reduction of inflammatory reaction by
inhibiting the affinity of macrophages to the vasoactive peptides in the pulpal tissue. The total exposure
time of 4 to 5 minutes for EDTA inside the canal must
not be exceeded.
After using the SM1 file (TF Adaptive sequence,
SybronEndo), we need to neutralise the acidity of the
EDTA in order to avoid a chemical interaction between
the acid and the base. (As a general rule, one should
always avoid any kind of chemical interactions inside
the root canal. Saline or distilled water can be used to
wash out the previous chemical prior to the use of a
different one.) Specifically, an acid and a base interaction leads to the formation of gas bubbles, which
can create the so-called dead water zone, or vapour
lock, not only at the end of the main canal or at the
entry to a lateral canal, but also anywhere inside the
root canal system. The interaction can also form a
small protective layer of air bubbles on the surface of
the collagen fibres, preventing their good contact
with NaOCl for a better dissolving action.
Irrigation with NaOCl for 30 seconds is performed
with the Master Delivery Tip, followed by rinsing with
saline or distilled water prior to the next application
of EDTA and the use of the SM2 file. Once the file has
been used, the acid is neutralised, and EndoVac’s
MacroCannula is used to remove and deeply neutralise the previous chemical. Then, another 30-second irrigation with NaOCl is performed in each canal
prepared with the SM2 file with the MacroCannula.
The idea is to create an area of negative pressure
inside the root canal system to draw the NaOCl delivered into the access cavity deeper into the system
safely, thus creating a current of fresh irrigant inside
the root canal system for a more efficient chemical
interaction and organic tissue dissolution.
[17] =>
special _ root canal disinfection
The same sequence is used for the SM3 file. An
EDTA solution is placed during apical preparation
with this final rotary file, followed by saline or water,
but using EndoVac’s MicroCannula, since it fits into
the apical area and its lateral holes can create negative pressure (short-term vacuum) exactly at the
working length, removing all the air bubbles as well.
Then, 30 seconds of NaOCl irrigation in each canal
follows, with a small modification: since the MicroCannula holes are small, it needs a bit more time to
evacuate fluids from the apical area; therefore, irrigation with the Master Delivery Tip is performed for
10 seconds, followed by a 5-second pause, for three
such cycles in each canal.
Finishing the chemical preparation of the root
canal system starts first with flushing out NaOCl with
saline and drying the space with the MicroCannula.
Then, chlorhexidine is introduced into each canal for
10 seconds to inhibit the dentine’s matrix metalloproteinases for better stability of the bonding, since
we use bonded root canal sealer for obturation. The
final and very important step is to flush all the chemicals from the root canal system with distilled water
or saline. The reasoning is as follows:
_Since water is not compressible, using the cannulas
to suction the fluids from the root canal system will
allow the sealer to enter and seal the system.
_Any chemical can be toxic and pushing chemicals
outside the root itself with the master cone can
create some inflammation, which may result in
post-operative pain; therefore, it is best to remove
all liquids remaining in the canal.
_Chemicals can interact with the components of
some sealers and consequently reduce either their
bonding or sealing ability, or even react with some
radio-opacifiers, such as bismuth, and cause a chemical reaction that could destroy the obturation material. Oxygen can inhibit bonding, while EDTA can
also have a negative effect on the sealer–dentine
interaction.
I
_Discussion
Many types of irrigants can be used, such as hydrogen peroxide, anaesthetic solutions, physiological serum, and deionodised water. What is proposed
is an irrigation sequence that may be more complex
depending on the clinical situation. The alternation
between irrigants (NaOCl, chlorhexidine, distilled water, and EDTA) is essential for the cleaning of the root
canal system.
The reduced preparation time when using rotary
NiTi instruments is balanced by copious irrigation for
better cleaning of the root canal system, which will
contribute to the increased success rate of endodontic treatment.
The chemical preparation will help us succeed in
adequate cleaning of the main canal and its systems.
Cleaning is followed by 3-D obturation to fill all the
cleansed and prepared canals.
_Conclusion
The irrigation procedure is often dismissed as simple during endodontic treatment; however, it must
not be overlooked, since it is crucial to the success of
endodontic treatment.
Irrigation, which is too often reduced to a needle
on the tray, has to be systematically evaluated in order
to become an endodontic entity with a precise time
schedule and procedural systematisation._
Acknowledgement: I would like to thank Yulia Vorobyeva,
interpreter and translator, for her help with this article.
_Irrigation sequence during root canal
treatment of a necrotic tooth
The main difference between vital and necrotic
teeth is the absence, though partial, of the pulpal
parenchyma with the abundance of bacteria present in the latter. For this reason, the irrigation sequence is different. Irrigation should be initiated
with either NaOCl (5.25%) for its antibacterial effect
or with chlorhexidine (0.02%) for 30 to 40 seconds
to eliminate the various bacterial types present in the
root canals and dentinal tubules. Distilled water is
used to neutralise the effect of each of these irrigants. Then, the same irrigation sequence as described
previously for vital teeth is repeated.
_author
roots
Dr Philippe Sleiman
Advanced American Dental
Center
Al Bateen Area
P.O. Box: 41269
Abu Dhabi
UAE
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I special _ root canal disinfection
PHAST PIPS:
The photoacoustic
wave of the future?
Author_ Dr Reid Pullen, USA
Fig. 1a
Fig. 1b
_Photon induced photoacoustic streaming (PIPS)
is a low-energy (20mJ) technique based on very short
Er:YAG laser-emitted photons introduced into an
irrigation solution inside the access of the tooth. This
process, which uses the Lightwalker (Lasers4Dentistry),
introduces an aggressive and effective photoacoustic
streaming or tidal wave of irrigation solution into
canals, accessory anatomy and deep into the dentinal
tubules of the root canal system. PHAST PIPS can be
described as “irrigation on steroids”.
The goal of PHAST PIPS is to greatly enhance
chemical debridement of the complete root canal system in concert with mechanical instrumentation to
reduce the microorganism load to as low as possible.
This article will introduce four PHAST PIPS cases
and will discuss why to use PIPS, how to use PIPS and
when to use PIPS.
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_Case 1
A 20-year-old female patient presents to the
office with instructions from her dentist stating:
“Please remove the file and finish the root canal.”
The patient’s dentist initiated root canal treatment
on #37 two days prior and separated a rotary instrument in the apical one-third of the distal canal
(Fig. 1a).
Clinical testing revealed a temporary crown with
percussion and bite sensitivity. Probing, palpation
and mobility were within normal limits. Endodontic therapy was initiated on tooth #37 with a diagnosis of previously initiated therapy with symptomatic apical periodontitis.
Upon access, it was noted that the coronal shape
was underprepared. The coronal flare was com-
[19] =>
special _ root canal disinfection
Fig. 2a
pleted with a ProTaper Sx (DENTSPLY) orifice opener
and Gates Glidden #2 and #3. The PIPS irrigation
technique with the Lightwalker Er:YAG laser was
used for 30 seconds with the access chamber continually flushed with 6 per cent sodium hypochlorite.
I
Fig. 2b
increment, the file loosened but did not dislodge.
The PIPS technique was used again for 30 seconds,
alternating with ultrasonic vibration of the file. On
the third PIPS use, the file floated out of the canal.
An accurate working length was established
with a Root ZX (J. Morita) and an open glide path
created. The canals were shaped with the WaveOne
Primary (DENTSPLY) reciprocating rotary file and
obturated with a resin-based sealer (Fig. 1b).
After applying this technique in more than 1,500
cases, I have found that “PIPS-ing” after the coronal flare allows easier and quicker negotiation,
which then helps the clinician to obtain an accurate
working length.
_Case 2
After drying the three canals with the EndoVac
Macrocanula, the top portion of the file was visualized. The UT4 (eie2) ultrasonic tip was used in 10second increments to vibrate the top of the file and
create lateral space to allow file movement and
escape. After each ultrasonic use, the canals were
flushed with sodium hypochlorite and the distal
canal was dried with the macrocanula to allow
visualization of the file. After the third ultrasonic
An asymptomatic male patient presents to the
office with a referral card with the instructions:
“Please remove the separated file, fill and leave post
space.” The root canal was initiated by his general
dentist one week prior. During the procedure, a file
was separated in the palatal canal. The dentist was
able to shape and obturate the buccal canal. The
diagnosis was listed as previously initiated therapy
with asymptomatic apical periodontitis.
Fig. 3a
Fig. 3b
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Fig. 4a
Fig. 4b
The root canal was initiated and the access
was opened. A 30-second PIPS cycle with the Lightwalker Er:YAG was completed with 6 per cent sodium
hypochlorite to clean out any residual debris. The
Endo-Vac Macrocanula was used to remove fluid
from the canal. The top of the file was visualized
through the microscope.
The UT4 (eie2) ultrasonic tip was used in 10-second increments to help vibrate the top of the file
and to create lateral space. The file was slightly
loosened after a few ultrasonic uses, but not completely dislodged. Two 30-second PIPS cycles were
completed in between and after ultrasonic use.
On the third PIPS cycle of the procedure, the file
floated out of the canal. (In some cases I was unable to remove a separated file with ultrasonics
and PIPS.)
The canal was then properly shaped and obturated with an apical plug of zinc oxide eugenol sealer
and gutta-percha using a warm-vertical technique.
A post space was left as requested by the general
dentist (Figs. 2a & b).
_Case 3
A male patient presents to the office with a history of chewing pain and a constant ache on #26
of one-week duration. Clinical tests reveal #26 is
percussion, bite-stick and cold-test negative, and
a diagnosis is listed as pulp necrosis with symptomatic apical periodontitis.
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Root canal treatment was initiated on tooth
#26, and four necrotic canals were located. The
coronal flare shape was completed, and the PIPS
(Lightwalker Er:YAG) irrigation method was used
with 6 per cent sodium hypochlorite for 30 seconds. A working length was obtained and an open
glide path was achieved with the Path File rotary
files (DENTSPLY). An open glide path was difficult
to achieve because of length and angulation of the
canals.
The shaping procedure commenced with the
WaveOne Primary file 0.08/#25 tip (DENTSPLY).
The shaping procedure was slow and difficult, and
it took five to seven passes (a pass is defined as an
entry into the canal, up-and-down shaping, and
exiting the canal) with the WaveOne Primary file to
fully shape all four canals to working length.
The PIPS technique with 6 per cent sodium
hypochlorite was used twice during the shaping
procedure to help clear the dentinal debris. Patency
was established after every pass with a #10 K file.
The final protocol PIPS was completed to help
chemically debride the root canal system, and the
canals were obturated with a zinc oxide eugenol
sealer and gutta-percha using a warm-vertical
technique.
Upon completion it was noted that an accessory
canal in the palatal and a lateral canal in the midroot of the distobuccal canals were filled with sealer
(Figs. 3a & b).
[21] =>
special _ root canal disinfection
_Case 4
A male patient presents to the office with
an on-and-off toothache of approximately 10
months’ duration. Clinical tests reveal a percussion- and bitestick-sensitive maxillary first bicuspid. The tooth does not respond to cold tests. The
diagnosis is listed as pulp necrosis with symptomatic apical periodontitis. Radiographs show an
apical and lateral radiolucency.
Root canal treatment was initiated on tooth
#14, and two necrotic canals were located. The
coronal flare or opening was completed, and a
30-second PIPS cycle with 6 per cent sodium
hypochlorite was initiated. Working length and
glide path were obtained, and the canals shaped
with the WaveOne Primary (DENTSPLY) reciprocating file. During the shaping procedure, a 30second PIPS bleach cycle was completed.
The canals were obturated with a zinc oxide
eugenol sealer and gutta-percha using a warmvertical technique. The post-operative radiographs showed a lateral canal filled with guttapercha leading to the lateral radiolucency (Figs.
4a & b).
I
I have completed more than 1,500 cases using
the PIPS as an irrigation technique. I have kept
my endodontic technique nearly the same but
added the PIPS Lightwalker Er:YAG to enhance
chemical debridement (laser-assisted irrigation).
Based on my clinical observation, I feel that I have
a decreased post-operative sensitivity, and when
I look through the microscope after the final PIPS
cycle, the canals are so exceptionally clean that
I notice the dust that the paper points give off. As
far as a better success rate, the jury is still out. It
seems that since I have incorporated the PIPS
technique, I have had less post-operative problems and better healing.
In conclusion, PIPS and the photoacoustic wave
of irrigant it produces appear to have a bright future in endodontics._
_References
1. Peters OA, Bardsley S, Fong J, Pandher, DiVito E, JOE:
p1008–1112, Vol. 37, No. 7, July 2011.
2. Jaramillo DE, Aprecio RM, Angelov N, DiVito E, McClamy TV,
Endodontic Practice: p 28–32, Vol. 5, No. 3, 2012.
_Conclusion
Along with mechanical debridement, the PIPS
Lightwalker Er:YAG irrigation technique shows
great potential in debridement of the root canal
system, including main canals, lateral/accessory
canals, isthmuses and dentinal tubules (why to
use PIPS). Various studies1, 2 show that the PIPS
technique greatly reduces bacterial flora. As always, ongoing research is needed to show how
much the PIPS Lightwalker Er:YAG can really accomplish in debridement.
The PIPS Lightwalker Er:YAG technique works
best when the dental assistant irrigates the access continuously while suctioning any excess
solution running from the area. The trick is to
keep the access chamber full of solution so that
the 4 mm unsheathed portion of the PIPS tip stays
submerged in fluid. This can be accomplished by
the dental assistant moving the surgical suction
closer or farther away from the access to allow
just the right amount of solution (how to use
PIPS).
I recommend using the PIPS Lightwalker
Er:YAG technique to enhance chemical debridement after the coronal flare, once during the
cleaning and shaping phase and just prior to obturation (when to use PIPS).
_about the author
roots
Dr Reid Pullen, DDS,
FAGD, graduated from USC
dental school in 1999.
He was stationed in Landstuhl, Germany, as an Army
dentist from 1999 to 2002.
He completed an advanced
education in general dentistry residency in the Army
in 2000. He was in general dental private practice
from 2002 to 2004 in Yorba Linda, California, USA,
and then he completed the Department of Veterans
Affairs endodontic residency program in Long
Beach, California, USA, receiving his endodontic
certificate in 2006. He opened his own private
endodontic practice in Brea, Calif., in 2007.
He became a diplomate of the American Board
of Endodontics in 2013. He may be contacted at
reidpullen3@hotmail.com
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_ 2014
[22] =>
I technique _ root canal shaping
Fifth-generation
technology in endodontics:
The shaping movement
Authors_ Drs Clifford J. Ruddle, John D. West & Pierre Machtou, USA
Fig. 1a
Fig. 1b
Fig. 1a_A µCT image of a maxillary
central incisor demonstrating
a root-canal system with multiple
portals of exit.
Fig. 1b_A pre-op radiograph
revealing an endodontically failing
anterior bridge abutment with
a draining fistula.
Fig. 1c_This post-op retreatment
image emphasises that shaping
canals promotes 3-D cleaning and
filling of root-canal systems.
Fig. 1d_A 25-year recall radiograph
demonstrating osseous healing.
22 I roots
1_ 2014
Fig. 1c
_Since the beginningof modern-day endodontics,
there have been numerous concepts, strategies, and
techniques for preparing canals. Over the decades, a
staggering array of files have emerged for negotiating
and shaping them. In spite of the design of the file, the
number of instruments required and the surprising
multitude of techniques advocated, endodontic treatment has typically been approached with optimism for
probable success.
The breakthrough in clinical endodontics progressed
from utilising a long series of stainless-steel (SS) hand
files and several rotary Gates-Glidden drills to the integration of nickel-titanium (NiTi) files for shaping canals.
Regardless of the methods, the mechanical objectives
were brilliantly outlined by Dr Herbert Schilder almost
40 years ago.1 When performed properly, they promote
the biological objectives for shaping canals, 3-D disinfection, and filling root-canal systems (Figs. 1a–d). The
purpose of this article is to identify and compare how
each new generation of endodontic NiTi shaping files
has helped to advance canal preparation methods. More
importantly, it will discuss a new file system and describe
a clinical technique that combines the most successful
design features from the past with today’s innovations.
Fig. 1d
_NiTi shaping movement
In 1988, Walia proposed nitinol, a NiTi alloy for
shaping canals, which is two to three times more
flexible than SS.2 A game-changing feature of files
manufactured from NiTi was that curved canals could
be mechanically prepared through continuous rotary
motion. By the mid-1990s, the first commercially
available NiTi rotary files were launched to the market.3 The following overview is a mechanical classification of each generation of file systems. Rather than
identify the myriad of available cross-sections, files
will be characterised as having either a passive or an
active cutting action.
First generation
In order to appreciate the evolution of NiTi mechanical instruments, it is useful to know that firstgeneration NiTi files in general have passive cutting
radial lands and fixed tapers of 4 and 6 per cent over
the length of their active blades (Fig. 2).4 This generation of technology required numerous files for
achieving the preparation objectives. From the mid
to late 1990s, GT files (DENTSPLY Tulsa Dental Spe-
[23] =>
technique _ root canal shaping
I
Fig. 2_Two scanning electron
microscope images showing the
cross-sectional and lateral views of
a passively cutting radial-landed file.
Fig. 3_Two scanning electron
microscope images showing the
cross-sectional and lateral views
of an active file with sharp cutting
edges.
Fig. 2
Fig. 3
cialties) became available that provided a fixed taper
on a single file of 6, 8, 10, and 12 per cent .5 The most
important design feature of first-generation NiTi
rotary files was passive radial lands, which helped a
file to stay centred in canal curvatures during work.
As such, the perceived advantages of electropolishing were offset by the undesirable inward pressure
required to advance a file to length. Excessive inward
pressure, especially when utilising fixed-taper files,
promotes taper lock, the screw effect and excessive
torque on a rotary file during work.9 In order to offset deficiencies in general, or inefficiencies resulting
from electropolishing, cross-sectional designs have
increased and rotational but dangerous speeds are
advocated.
Second generation
The second generation of NiTi rotary files reached
dental markets in 2001.6 The one feature that distinguished this generation of instruments from previous ones is that they have active cutting edges and
thus require fewer instruments to prepare a canal
fully (Fig. 3).
In order to prevent taper lock and the resultant
screw effect associated with both passive and active
fixed-taper NiTi cutting instruments, EndoSequence
(Brasseler) and BioRaCe (FKG Dentaire) provided file
lines with alternating contact points.7 Although this
feature is intended to mitigate taper lock, these file
lines still have a fixed-taper design over their active
portions. The clinical breakthrough occurred when
ProTaper Universal (DENTSPLY Tulsa Dental Specialties) utilised multiple tapers of an increasing or decreasing percentage on a single file. This revolutionary, progressively tapered design limits each file’s
cutting action to a specific region of the canal and
affords a shorter sequence of files to produce deep
Schilderian shapes safely (Fig. 4).8 During this time,
manufacturers began to focus on other methods
that could increase the resistance to file separation.
Some manufacturers, for example, electropolished
their files to remove surface irregularities caused by
the traditional grinding process. However, it has
been observed clinically and reported scientifically
that electropolishing dulls the sharp cutting edges.
Third generation
Improvements in NiTi metallurgy became the hallmark of what may be considered the third generation
of mechanical shaping files. In 2007, some manufacturers began to focus on using heating and cooling
methods for the purpose of reducing cyclic fatigue
in and improving safety with rotary NiTi instruments
Fig. 4_The ProTaper shaping files
cut dominantly in their coronal and
middle one-thirds, whereas the
finishing files cut primarily in their
apical one-thirds.
Fig. 4
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[24] =>
I technique _ root canal shaping
Fig. 5
Fig. 6
Fig. 5_A WaveOne reciprocating
file utilises unequal CCW and CW
angles to improve efficiency, inward
progression and removal of debris
from the canal.
Fig. 6_A cross-section of a ProTaper
Next file. Note that an offset mass
of rotation desirably reduces file
engagement, provides greater space
debris, and improves flexibility.
used in canals that are more curved.10 The intended
phase-transition point between martensite and
austenite was identified as producing a more clinically optimal metal than NiTi. This third generation of
NiTi instruments significantly reduced cyclic fatigue
and, hence, broken files. Some examples of brands
that offer heat treatment technology are Twisted
Files (SybronEndo), HyFlex (Coltène/Whaledent), and
GT, Vortex, and WaveOne (all DENTSPLY Tulsa Dental
Specialties).
ment are M4 (SybronEndo), Endo-Express (Essential
Dental Systems), and Endo-Eze (Ultradent). Compared with full rotation, a reciprocating file requires
more inward pressure to progress and will not cut as
efficiently as a rotary file of the same size. It is also
more limited in removing debris from the canal. Based
on these experiences, innovation in reciprocation
technology led to a fourth generation of instruments
for shaping canals. This generation of instruments
and its related technology have fuelled the hope again
for a single-file technique.
Fourth generation
Another advancement in canal preparation procedures was achieved with reciprocation, a process that
may be defined as any repetitive up-and-down or
back-and-forth motion. This technology was first introduced in the late 1950s by a French dentist. Recent
brands that use equal clockwise (CW) and counterclockwise (CCW) degrees of rotation in their moveFig. 7_The five ProTaper Next files.
Most canals in posterior teeth can be
optimally shaped using two or three
instruments.
Fig. 7
24 I roots
1_ 2014
ReDent Nova introduced the Self Adjusting File.
This has a compressible open-tube design that is purported to exert uniform pressure on the dentinal
walls, regardless of the cross-sectional configuration
of the canal. It is mechanically driven by a handpiece
that produces both a short 0.4mm vertical amplitude
stroke and vibrating movement with constant irrigation.11 Another emerging single-file technique is One
[25] =>
technique _ root canal shaping
Fig. 8a
Shape (MICRO-MEGA), which will be mentioned
again in the section on the fifth generation of instruments.
By far the most popular single-file concepts are
DENTSPLY’s WaveOne and RECIPROC (VDW). WaveOne
combines the best design features of the second and
third generation of files, complemented by a reciprocating motor that drives any given file in unequal
bidirectional angles. The CCW engaging angle is five
times the CW disengaging angle and was designed
to be lower than the elastic limit of the file. After three
CCW and CW cutting cycles, the file will have rotated
360 degrees, or one full circle (Fig. 5). The reciprocating movement allows a file to progress more readily,
cut efficiently, and remove debris from the canal effectively.12
Fifth generation
The latest generation of shaping files have been
designed in such a way that the centre of mass or the
centre of rotation, or both, are offset (Fig. 6). When
in rotation, files that have an offset design produce
a mechanical wave of motion that travels along the
active length of the file. Like the progressively percentage tapered design of ProTaper files, this design
minimises the engagement between the file and dentine.13 In addition, it enhances the removal of debris
from a canal and improves flexibility along the active
portion of the file. The advantages of an offset design
will be discussed later in this article. Commercial examples of file brands that offer variations of this technology are Revo-S, One Shape (both MICRO-MEGA)
and ProTaper Next (DENTSPLY Tulsa Dental Specialties/
DENTSPLY Maillefer). Currently, the simplest, safest,
and most efficient file systems combine the most
proven design features with the most recent technological advancements. The following will offer a
brief technical overview of the ProTaper Next rotary
file system.
_ProTaper Next
There are five ProTaper Next (PTN) files in different
lengths available for shaping canals: X1, X2, X3, X4
and X5 (Fig. 7). These files have yellow, red, blue, double black, and double yellow identification rings on
their handles, corresponding to sizes 17.04, 25.06,
30.07, 40.06, and 50.06. The tapers are not fixed over
the active portion of the files. Both the X1 and X2 files
have an increasing and decreasing percentage taper
on a single file, whereas the X3, X4, and X5 files have
a fixed taper from D1 to D3, then a decreasing percentage taper over the rest of their active portions.
I
Fig. 8b
Fig. 8a_A radiograph showing
an endodontically involved posterior
bridge abutment. Note the orientation
of the prosthesis to the underlying
roots.
Fig. 8b_A working image showing
coronal disassembly, isolation and
#10 files traversing through canals
that exhibit curvatures and
recurvatures.
PTN files are the convergence of three significant
design features, which include a progressive percentage taper on a single file, M-Wire technology, and the
fifth generation of continuous improvement, the offset design. As an example, the X1 file has a centred
mass and axis of rotation from D1 to D3, whereas it has
an offset mass of rotation from D4 to D16. Starting at
4 per cent, the X1 file has ten increasing percentage
tapers from D1 to D11, whereas there are decreasing
percentage tapers from D12 to D16 to enhance flexibility and conserve radicular dentine during shaping.
PTN files are used at 300rpm and a torque of
2–5.2Ncm, based on the method used. However, the
authors prefer a torque of 5.2Ncm, as this level of
torque has been validated as profoundly safe if clinicians perform meticulous glide path management
procedures and utilise a deliberate outward brushing
motion as they progressively shape canals.14
_ProTaper Next shaping technique
In the PTN shaping technique, all files are used in
exactly the same way, and the sequence always follows the ISO colour progression and is always the
same regardless of the length, diameter, or curvature
of a canal. The PTN shaping technique is extraordi-
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1
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[26] =>
I technique _ root canal shaping
Fig. 8c
Fig. 8d
Fig. 8c_A video grab image
showing a mechanical wave of
motion travelling along the active
portion of a PTN X1 shaping file.
Fig. 8d_A video grab image showing
a PTN X2 file at length in the
mesiobuccal root-canal system.
narily safe, efficient and simplistic when attention
is focused on access preparation and glide path
management. As required for any shaping technique,
straight-line access to each orifice is emphasised. Attention is directed to flaring, flattening, and finishing
the internal axial walls. For radicular access, the original ProTaper system offers the auxiliary shaping file
SX, which is used in a brushing motion on the outstroke to pre-flare the orifice, eliminate triangles of
dentine, relocate the coronal-most aspect of a canal
away from external root concavities, or produce more
curvature if desired.
Perhaps the greatest challenge in performing endodontic treatment is to find, follow, and predictably
secure any given canal to its terminus. Negotiating
and securing canals with small manual files requires
a mechanical strategy, skilful touch, patience and
dedication.
A small hand file is used initially to scout, expand,
and refine the internal walls of the canal. Once the
canal can be reproduced manually, a dedicated mechanical glide path file may be used to expand the
working width in preparation for shaping procedures.15 For clarification, a canal is secured when it
is empty and has a confirmed, smooth, and reproducible glide path. With an estimated working length
and in the presence of a viscous chelator, a #10 file
is inserted into the orifice. Then it is determined
whether the file moves towards the terminus of the
canal easily. In shorter, wider, and straighter canals,
a #10 file can usually be inserted to the desired
working length. Once a #10 file has been confirmed
to be loose at length, the glide path may be further
enlarged with either a #15 hand file or dedicated
mechanical glide path files, such as PathFiles
(DENTSPLY Tulsa Dental Specialties). The glide path
just described confirms that sufficient existing space
is available to initiate mechanical shaping procedures with the PTN X1 file.
26 I roots
1_ 2014
In other instances, certain endodontically involved
teeth have roots with canals that are longer, narrower
and more curved (Fig. 8a). In these situations, often a
#10 file will not go to length initially. Generally, there
is no need to use #6 and/or #8 hand files in an effort
to reach the terminus of the canal immediately.
Rather, the size #10 hand file simply has to be worked
gently within any region of the canal until it is completely loose. PTN files can be used to shape any region of a canal that has a smooth and reproducible
glide path. Regardless of the glide path and shaping
sequence, the objective is to negotiate the entire
length of the canal, establish working length, and
confirm apical patency (Fig. 8b). The canal is secured
and a glide path is verified when a #10 file is loose at
length and can reproducibly slip, slide and glide over
the apical one-third of the canal.
Once the canal has been secured, the access cavity
is flushed voluminously with a 6% solution of NaOCl.
Shaping can then commence, starting with the PTN
X1 file. It should be noted that PTN files are never used
with an inward pumping or pecking motion. Rather,
they are used with an outward brushing motion. This
method will enable any PTN file to move inward passively, follow the glide path and progress towards
the working length. The X1 file is carried through the
access and inserted passively into a pre-flared orifice
and secured canal. Before encountering resistance,
deliberate brushing on the outstroke has to begin immediately (Fig. 8c). Brushing creates lateral space and
enables this file to progress a few millimetres inward.
A brushing action serves to improve contact between
the file and dentine, especially in canals that exhibit
irregular cross-sections or deviations off their rounder
parts.
Progression with the PTN X1 file through the body
of the canal has to be continued. After every few millimetres of file progression, the mechanical shaping
file has to be removed to inspect and clean its flutes.
[27] =>
technique _ root canal shaping
Fig. 8e
Before reinserting the X1 file, it is critical to irrigate
and flush out gross debris, recapitulate with a #10 file
to break up residual debris and move the debris into
solution, then re-irrigate to liberate this debris.
In one or more passes, progression with the X1 file
should be continued until the working length is
reached. In order to promote the mechanical objectives, clinicians are advised to always irrigate, recapitulate and then re-irrigate after removing any mechanical shaping file. The PTN X2 file then has to be
selected and used to begin to advance inward. Before encountering resistance, it has to be brushed
against the dentinal walls, which will enable the X2
file to advance inward passively and progressively.
The X2 file will follow the path of the X1 file easily,
shape progressively, and advance incrementally towards the working length. If this file becomes stuck
and ceases to move inward, it has to be removed and
cleaned. Flutes have to be inspected as well before
irrigation, recapitulation and re-irrigation. Progression with the X2 file is continued until the working
length is reached. It may take one or more passes,
depending on the length, width, and curvature of the
canal (Fig. 8d).
Once the PTN X2 file has reached the working
length, it is removed. The shape may be confirmed as
finished when the apical flutes of this file are visibly
loaded with dentine. Alternatively, the size of the
foramen may be gauged with a 25.02 NiTi hand file.
When the #25 hand file is snug at length, the shape
is finished. If the 25.02 hand file is loose at length, it
simply means that the foramen is larger than 0.25mm.
In this instance, the foramen may be gauged with a
30.02 NiTi hand file.
If the #30 hand file is snug at length, the shape is
finished. However, if the #30 hand file is short of the
working length, proceed to the PTN X3 file, following
the method just described for the PTN X1 and X2 files.
The vast majority of canals will be optimally
shaped after using either the PTN X2 or X3 files (Fig. 8e).
The PTN X4 and X5 files are primarily used to prepare
and finish larger-diameter canals. When the apical
foramen is determined to be larger than a 50.06 X5 file,
other recognised shaping methods may be utilised
to finish these larger canals, which are typically less
curved and more straightforward to prepare. It is important to appreciate that meticulously secured canals
promote shaping, 3-D cleaning, and filling of rootcanal systems (Fig. 8f).
I
Fig. 8f
Fig. 8e_A video grab image
showing a PTN X3 file at length
in the distal root-canal system.
Fig. 8f_A radiograph showing
the provisional bridge, flowing
shapes, and the importance of
treating root-canal systems.
_Discussion
From a clinical standpoint, the PTN rotary system
is a convergence of the most proven and successful
generational designs, coupled with the most recent
advances in critical path technology. This brief discussion will consider the influence of design on performance.
The most successful generational design is the mechanical concept of utilising a progressive percentage
taper on a single file. The patent-protected ProTaper
Universal NiTi rotary file system utilises an increasing
or decreasing percentage taper on a single file. This
design feature serves to minimise the contact between a file and dentine, which decreases the risk of
taper lock and the screw effect while increasing efficiency.8 Compared with a fixed-taper file of similar
size, a decreasing percentage taper design, strategically improves flexibility, limits the shaping in the body
of the canal, and conserves two-thirds of coronal
dentine.
Following this mechanical design, PTN also features progressive tapers on a single file. This design
has contributed to the ProTaper system becoming the
top-selling file in the world, the file choice of endodontists, and the leading system taught to undergraduate students in dental schools internationally.16
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[28] =>
I technique _ root canal shaping
Many instruments break as a result of excessive
debris packed between the cutting flutes over the
active portion of a file. More importantly, an offset
file design decreases the probability of laterally
compacting debris and blocking the root-canal system (Fig. 6).
3. A shaping file with an offset mass of rotation will
generate a mechanical wave of motion analogous
to the oscillation along a sinusoidal wave (Fig. 10).
Owing to this design, any PTN file can cut a larger
envelope of motion compared with a file of similar
size with a symmetrical mass and axis of rotation
(Fig. 6). The clinical advantage of this is a smaller
and more flexible PTN file that can prepare the canal
to the same size as a larger and stiffer file with a
centred mass and axis of rotation can (Fig. 9).
Fig. 9
_Conclusion
Fig. 10
Fig. 9_A PTN file has a progressively
tapered and offset design. These
features minimise engagement,
maximise debris removal and
improve flexibility. In contrast,
the bottom image shows a fixedtaper file with a centred mass and
axis of rotation.
Fig. 10_Similar to a sinusoidal wave,
a rotating PTN file produces
a mechanical wave of motion,
or a swaggering effect, along its
active portion.
28 I roots
1_ 2014
Another critical design feature that is intended
to benefit certain brand lines of mechanical shaping
files is metallurgy. Although NiTi files have been
shown to be two to three times more flexible than
SS files of the same size, additional metallurgical benefits using heat treatment have been identified. Research and development has focused on heating and
cooling traditional NiTi, either pre- or post-machining.
Heat treatment aims to create a more optimal phasetransition point between martensite and austenite.
Each new generation of shaping files was intended
to offer improvements on previous generations. Being
a fifth-generation system, PTN was designed to bring
together the most proven performance features and
the most recent technological advancements. The
system should simplify rotary shaping procedures by
eliminating the number of files typically used to shape
canals and through the so-called hybrid techniques.
Clinically, PTN files fulfil the three sacred tenets for
shaping canals, which are safety, efficiency and simplicity. Scientifically, further evidence-based research
is needed to validate the benefits of this system.
_Acknowledgement
It should be appreciated that the best transition
point is dependent on the cross-section of the file.
Research has shown that M-Wire, a metallurgically
improved version of NiTi, reduces cyclic fatigue by
400 per cent when comparing files of the same D0
diameter, cross-section, and taper.17 This third-generational advancement is a strategic improvement to
the overall clinical safety and performance of the PTN
rotary file system. The third design feature of PTN is
related to its offset cross-sectional design. There are
three major advantages when the mass of rotation of
a continuously rotating file is offset:13
The authors would like to recognise Dr Michael J.
Scianamblo for his work in the field of critical path
technology, which led to the development of ProTaper
Next._
1. An offset design generates a travelling mechanical
wave of motion along the active portion of a file. This
swaggering effect minimises the engagement between the file and dentine compared with the action
of a fixed-taper file with a centred mass of rotation
(Fig. 9). Reduced engagement limits taper lock, the
screw effect, and torque with any given file.
2. A file with an offset design affords more crosssectional space for enhanced cutting, loading and
removal of debris from a canal compared with a file
with a centred mass and axis of rotation (Fig. 10).
_contact
Editorial note: This article originally appeared in Dentistry
Today in April 2013. A list of references is available from the
publisher. Drs Ruddle, Machtou, and West have a financial
interest in the products they design and develop, which
includes the ProTaper Universal system.
roots
Dr Clifford J. Ruddle
is Founder and Director
of Advanced Endodontics,
an international educational
source, in Santa Barbara,
California, USA.
He can be contacted at
info@endoruddle.com
[29] =>
Tel: +1 424 744 0608 / email: c.ferret@tribunecme.com / www.TribuneCME.com
[30] =>
I technique _ use of apex locators
The rationale and use of
electronic apex locators
Author_ Dr L. Stephen Buchanan, USA
_Electronic apex locators (EALs) are my best
friend when performing a root canal. Of all the devices I use in practice, my RootZX-mini (Fig. 1) is the
most indispensable. This is borne out by the fact that
most endodontists use an EAL to determine length in
every root canal they treat.
The rationale for using an EAL in every single canal
you treat? A short review of the anatomy literature
reveals conventional radiography to be no greater
than 80 per cent accurate for length determination,
vs. 97 per cent accuracy with EALs. One of the worst
endo concepts—ever—has been the procedural recommendation that we treat root canals a certain distance
from the root apex—a strategy based on the average
position of root canal foramina.
Fig. 1_The RootZX-mini.
Unfortunately, none of our patients is average.
Every single root canal you enter for the next 35 years
of practice will be different than the one before. So
how is it going to work when we arbitrarily assign apical preparation sizes based on averages? Not so good,
actually. When we decide all small canals should be
enlarged to a #35 file size at the end of the prep, we
will often have one of two untoward outcomes: apical damage or incomplete preparation.
So it is with length determination.
With an EAL, you will know immediately when you
reach the end of root canals with the smallest, first
negotiating files – data that is so critical to controlling our use of these instruments and preventing apical damage. Without an apex locator, you will never
know where you are in a root canal until you have
horsed a #15 KF to estimated length and have taken
an X-ray; in small curved molar canals, this can be disastrous. Working initial negotiating files short in error invites apical blockage and ledging, while working
them erroneously long invites ripping apically curved
canals straight, outcomes that happen more often
than most of us realize.
Yet the majority of general dentists do not use EALs.
Why? Many have been unsuccessful in first use—no
surprise; EALs are technique-sensitive to use.
Here are the technique touch points I consider
when using an EAL:
Condition of the EAL
Confirm a good condition of the EAL, its batteries,
its cords and its file probes (Fig. 2). These are sensitive
electronic devices with boards inside that can break
when drop-kicked in an operatory. Be gentle with
them. When their signal shows halfway, replace the
batteries with fresh ones. When EAL cords have been
autoclaved repeatedly, they may develop tarnish that
inhibits conduction at the cord connections and at
the end of the file probe where it touches the shank of
the file being used. Using a bur brush here will take
care of the tarnish.
Ideally, use a straight file probe that has been gold
plated (this prevents oxidation) at its business end.
These work the best of all EAL probe designs I have
used (Fig. 3).
Fig. 1
30 I roots
1_ 2014
My least favorite is the spring-loaded test file leads
that most dentists attach to their files. They are too
[31] =>
technique _ use of apex locators
I
Fig. 2_Make sure your EAL is in good
working condition by checking its
batteries, cords and file probes.
Fig. 2
wide to fit them between the rubber stop and handle in canals longer than 22mm. Test leads attached
to files during negotiation dampen tactile feedback,
increasing the risk of damaging tortuous apical
anatomy.
restoration. To do so, get a finger rest, look carefully
as you center the file in the access prep, then direct
your attention to the EAL display as you turn the file
back and forth until the meter arrives at a reproducible length measurement.
The straight probe can be temporarily set on an
alcohol gauze, located on the patient’s bib, as the
assistant places the lip clip under the rubber dam—on
the opposite side of the tooth being treated, with the
EAL display nearby. When estimated length is approached, it is then very convenient to simply retrieve
the file probe from under the patient’s chin, touch its
thin, V-cut end to the file shank, between the rubber
stop and the handle (Fig. 4).
If you still have trouble keeping files from shorting, cut heat-shrink tubing (RadioShack) into 9mm
lengths and place them on your initial negotiating
files and the procedure can go on. A little practice and
this will no longer be necessary. Not to brag, but I
don’t have any greater difficulty using EALs through
metallic restorations or crowns and would
rather do that than work on teeth
devastated by caries.
Fig. 3
The file in hand is then advanced into the canal
until the display meter pegs to the farthest red “Apex”
indication, and the instrument is turned slowly in a
counter-clockwise direction until the meter is only lit
up to the simulated “0.5mm” mark and the green bar
opposite that mark stops blinking and holds steady
for a couple of seconds.
Lead sets typically need replacing in my office
every six to 12 months. Not autoclaving EAL cords and
probes is not good, and the temperature and steam
fatigues the insulation, so accept this and pop for a
new cord set every now and then.
Access cavity
Use of lubricant
Fig. 3_This straight file probe has
been gold plated at its business end
to prevent oxidation.
Use a lubricant such as RC Prep or ProLube instead
of NaOCl during electronic length determination. This
is the second requirement for working successfully
through access cavities with adjacent metal. In fact,
doing all initial negotiation procedures through an
access cavity filled with lubricant will smooth out all
EAL use as it helps eliminate the apical blockage so
common in vital cases. Not only has there been no
evidence-based research proving NaOCl is helpful for
negotiation procedures, all of our clinical experience
shows lubricants to be the ideal solution to have in the
pulp chamber as initial negotiating files are taken into
small curved canals. When sufficiently small first files
are used in a bath of lubricating solution, apical soft
tissue blockage can be totally avoided.
Cut a nice access cavity. I am often asked how I use
EALs when working next to metallic restorations, as
it can be difficult to avoid shorting the signal. My first
consideration is to make sure the line-angles of the
access cavity have been cut so that files may drop
smoothly, without hitch, into each canal without significant flexure of their shank ends.
File size
A well-cut access cavity will allow files to be easily
held away from an adjacent metal crown or alloy
Increase file size when EAL readings are erratic.
Simply using one or two larger sizes of negotiating file
Plus, all EAL readings are more stable with lubes,
and most erratic with bleach. Lose the bleach, until
later in the procedure.
roots
1
I 31
_ 2014
[32] =>
I technique _ use of apex locators
Fig. 4_When estimated length is
approached, it is then convenient
to simply retrieve the file probe.
Fig. 4
works virtually every time when first or second files
taken to length return an erratic, jumpy signal. Going
to a larger size file with a lubricant during EAL use will
solve erratic signals for most brands of apex locators.
Of all the unnecessary obstacles to success with
EALs, this one was my bêté noir for years until Johan
Masrelleiz twigged me to the use of lubricants during
EAL use.
Use an EAL often
Use an EAL in every canal you treat, and you will become proficient. Pulling the office EAL from the back
of a dusty closet once every two months—when radiographic length determination isn’t working—and
expecting immediate success requires a rich fantasy
life. Conversely, when I have an apex locator, I can be
on a dental mission in an underserved region and do
a pretty nice RCT with no X-ray machine. Get one, if
you don’t already have one, and use that sucker every
time, and you will have way more fun doing RCT.
_about the author
roots
Dr L. Stephen Buchanan, DDS, FICD, FACD is a
diplomate of the American Board of Endodontics
and an assistant clinical professor at the postgraduate endodontic programs at USC and UCLA.
He maintains a private practice limited to endodontics and implant surgery in Santa Barbara,
Calif., and is the founder of Dental Education
Laboratories, a hands-on training center serving
general dentists and endodontists upgrading their
skills in new endodontic and implant technology. Dr. Buchanan can be
reached through his business, Dental Education Laboratories,
www.DELendo.com, info@endobuchanan.com
32 I roots
1_ 2014
Length determination radiographs
Stop taking length determination radiographs—
take this recommendation to heart, and soon you will
be ready for the EAL homerun. If you are able to accept
gifts from heaven and are looking for a way to be more
efficient when delivering RCT, eschew length determination radiographs. Remember 80 per cent vs. 97
per cent? So what do we accomplish when we stop
everything to capture a length determination X-ray?
To see files as they exit molar root structure, multiple
X-rays are usually required, so why are we doing this?
Furthermore, curved canals change length as they
are worked. When you use an EAL for each negotiating file, it is common to observe the loss of 1/4 to 1/2
mm of canal length just going from the 08 KF to the
10KF, as the original irregular canal path is smoothed.
So do we capture a second length determination
X-ray, after negotiation, and a third after shaping?
Rather than spend the time to capture a radiographic record of a length that will change almost
immediately after, consider using today’s rotary instrumentation. I can literally cut an initial shape, a
final shape, gauge the terminus and fit a gutta-percha cone in less time than it usually takes to capture
a well-angulated X-ray image of a #15 KF at length.
Then, when I take an X-ray image with the cones in
place and be certain that the length represented will
be stable to the completion of the case. If you want to
eliminate working films altogether, use a lubricant
and an EAL during apical gauging procedures and you
will know exactly where to fit the cone.
I know this works; I practiced for three years (including live demonstrations) without taking a working film after canal location—and my apical accuracy
improved._
[33] =>
EXPERIENCE OUR ENTIRE COLLECTION ONLINE
[34] =>
I industry news _ VDW
Apex locator more precise
than CBCT
_Electronic length determination has become
the gold standard over the last few years. The Deutsche Gesellschaft für Zahn-, Mund- und Kieferheilkunde (German association for dental, oral and maxillofacial surgery) confirmed in a statement that this
technique is superior to working length determination with a conventional radiograph. However, 3-D
radiography (CBCT) provides an additional method
for determining the endodontic working length.
A study conducted at the University of Granada in
Spain evaluated the accuracy of working length determination based on these modern methods. For this
purpose, 150 extracted teeth were randomly divided
into five groups. The working length was determined
electronically with the RAYPEX 6 apex locator in four
groups, under dry conditions1 or in the presence of
three different irrigating solutions.2–4 The working
length of the fifth group was determined radiologically with a CBCT scan.5 Measuring points were the
major foramen and the apical constriction.
34 I roots
1_ 2014
The results obtained by electronic measurement
were more reliable than by CBCT scan, in particular regarding the determination of the major foramen. The
study therefore confirmed that RAYPEX 6 measures
the working length with more accuracy and reliability than CBCT does.
The study and a complete list of references are
available online at http://onlinelibrary.wiley.com/doi/
10.1111/iej.12140/abstract_
_contact
VDW
Fax: +49 89 62734 304
info@vdw-dental.com
www.vdw-dental.com
roots
[35] =>
www.DTStudyClub.com
Y education everywhere
and anytime
Y live and interactive webinars
Y more than 500 archived courses
Y a focused discussion forum
Y free membership
Y no travel costs
Y no time away from the practice
Y interaction with colleagues and
experts across the globe
Y a growing database of
scientific articles and case reports
Y ADA CERP-recognized
credit administration
Register for
FREE!
ADA CERP is a service of the American Dental Association to assist dental professionals in identifying quality providersof continuing dental education.
ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry.
[36] =>
I industry news _ Planmeca
New endodontic imaging
mode from Planmeca yields
detailed images without
noise or artefacts
_Planmeca ARA removes artefacts
efficiently
Metal restorations and root fillings in the patient’s mouth can cause shadows and streaks in
CBCT images. The intelligent Planmeca ARA Artefact
Removal Algorithm removes these artefacts efficiently from Planmeca ProMax 3D images.
_Planmeca AINO removes noise
from CBCT images
A particularly low radiation dose or small voxel
size can cause noise in 3-D X-ray images. The new
Planmeca AINO Adaptive Image Noise Optimiser
is an intelligent noise filter that reduces noise
in CBCT images without losing valuable details.
The filter improves image quality in the endodontic imaging mode, where noise is inherent
due to the extremely small voxel size. It is especially
useful when used in accordance with the Planmeca
Ultra Low Dose protocol, where noise is induced
by the particularly low dose. Planmeca AINO also
allows the reduction of exposure values and consequently the radiation dose in all other imaging
modes._
_Planmeca has introduced a new imaging mode
specially developed for use in endodontics and that
is ideal for cases dealing with small anatomical details, such as imaging of the ear. The new imaging
mode is available for all Planmeca ProMax 3D family
units and provides perfect visualisation of even the
smallest anatomical details. The program produces
extremely high-resolution images with a very small
voxel size (only 75µm). Owing to the intelligent
Planmeca AINO noise removal and Planmeca ARA
artefact removal algorithms, noise-free and crystalclear images are produced.
36 I roots
1_ 2014
_contact
Planmeca Oy
Asentajankatu 6
00880 Helsinki, Finland
www.planmeca.com
roots
[37] =>
6 Months Clinical Masters Program
in Advanced Implant Aesthetics
17 July 2014 to 22 November 2014, a total of 12 days of intensive live training
with the Masters in Como (IT), Barcelona (ES), Munich (DE)
Live surgery and hands-on with the masters in their own
institutes plus online mentoring and on-demand learning at
your own pace and location.
Learn from the Masters of Advanced Implant Aesthetics:
Registration information:
17 July 2014 to 22 November 2014
Details on www.TribuneCME.com
a total of 12 days in Como (IT), Barcelona (ES), Munich (DE)
contact us at tel.: +49 341 48474 302
email: request@tribunecme.com
Curriculum fee: € 11,900
Collaborate
on your cases
University
of the Pacific
Latest iPad
with courses
and access hours of
premium video training
and live webinars
you will receive a
certificate from the
University of the Pacific
all registrants receive
an iPad preloaded with
premium dental courses
100
ADA CERP
C.E. CREDITS
Tribune America LLC is the ADA CERP provider. ADA CERP is a service of the American Dental Association to assist dental professionals
in identifying quality providers of continuing dental education. ADA CERP does not approve or endorse individual courses or instructors,
nor does it imply acceptance of credit hours by boards of dentistry.
[38] =>
I events _ AAE
American Association of Endodontists
organised Root Canal Awareness Week
for the seventh time
_During its seventh annual Root Canal Awareness Week, which was held from 17 to 23 March, the
American Association of Endodontists (AAE) aimed to
dispel myths surrounding root canal treatment and
encourage general dentists to involve endodontists in
case assessment and treatment planning to save patients’ natural teeth.
“Ninety-four per cent of general practitioners
agree that endodontists are partners in delivering
quality dental care,” said AAE immediate past President Dr James C. Kulild. “By working together, general
dentists and endodontists can treat patients comfortably and save their natural teeth.”
_contact
roots
American Association of
Endodontists
www.aae.org
38 I roots
1_ 2014
Endodontists’ enhanced training, combined with
high levels of expertise, use of cutting-edge technology and impressive success rates are the main reasons
patients trust dental specialists, according to an AAE
survey. By partnering with endodontists, general dentists can ensure the highest quality of care while helping patients feel less anxious. In fact, 89 per cent of
patients report being satisfied after root canal treatment by an endodontist.
In order to encourage collaboration between general dentists and endodontists, the AAE offers several
free resources available for download from its website:
_Treatment Options for the Compromised Tooth:
A Decision Guide includes case examples with radiographs of successful endodontic treatment in difficult cases and encourages general dentists to assess
all possible endodontic treatment options to save the
natural detention.
_The case difficulty assessment and referral form
offers guidance to help evaluate a patient’s condition
and assess risk factors that may affect the outcome of
treatment.
_The ENDODONTICS: Colleagues for Excellence
newsletter highlights clinical topics of interest to
dentists who perform their own endodontic treatment, and benefit from coverage of best practices and
the latest advancements in the specialty.
_Endodontists: Partners in Patient Care is a video
that explains what an endodontist is and how specialists
work with general dentists to provide the highest levels
of patient care. It is a great resource to show patients and
general dentists when a referral to a specialist is needed.
By using these tools during Root Canal Awareness
Week and throughout the year, general dentists ensure
they are developing the best treatment plans to save
natural teeth and keep patients satisfied. Additional
clinical resources are available at www.aae.org_
[39] =>
FDI 2014 · New Delhi · India
Greater Noida (UP)
Annual World Dental Congress
11-14 September 2014
Deadline for
early bird registration
31 May 2014
A billion smiles welcome the world of dentistry
www.fdi2014.org.in
www.fdiworldental.org
[40] =>
I events _ meetings
International Events
2014
AAE Annual Session
30 April – 3 May, 2014
Washington, USA
www.aae.org
DGET Spring Meeting
9–10 May, 2014
Witten, Germany
www.dget.de
SFE Congress
12–14 June 2014
Nice, France
www.endodontie.fr
Asia Pacific Dental Congress (APDC)
Improving quality of life through better
dental care
17–19 June 2014
Dubai, UAE
www.apdentalcongress.org
18th World Congress on Dental Traumatology
19–21 June 2014
Istanbul, Turkey
www.iadt-dentaltrauma.org/2014conference/
index.html
2014 AAE/AAP/ACP Join Symposium
Teeth for a life time: Interdisciplinary Evidence
for Clinical Success
19–20 July 2014
Chicago, USA
www.perio.org/meetings/joint-symposium2014.htm
FDI Annual World Dental Congress
17–19 June 2014
Dubai, UAE
www.apdentalcongress.org
2014 AAE/AAP/ACP Join Symposium
Teeth for a life time: Interdisciplinary Evidence
for Clinical Success
11–14 September 2014
New Delhi, India
www.fdi2014.org.in
Italian Academy of Endodontics (AIE)
22nd National Congress
2–4 October 2014
Montecatini Terme, Italy
www.accademiaitalianaendodonzia.it
155th ADA Annual Session
9–12 October 2014
San Antonio, USA
www.ada.org
Digital Dentistry Show
16–18 October 2014
At the International Expodental Milano, Italy
www.digitaldentistryshow.com
ROOTS Summit
7–9 November 2014
Chennai, India
www.rootssummit2014.com
BES: 2014 Regional Meeting
14–15 November 2014
Manchester, UK
www.britishendodonticsociety.org.uk
40 I roots
1_ 2014
[41] =>
about the publisher _ submission guidelines
submission guidelines:
Please note that all the textual components of your submission
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I
Image requirements
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In addition, please note:
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Article lengths can vary greatly—from 1,500 to 5,500 words—
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Please consider this when formatting your document.
Questions?
Magda Wojtkiewicz (Managing Editor)
m.wojtkiewicz@oemus-media.de
roots
1
I 41
_ 2014
[42] =>
I about the publisher _ imprint
roots
international magazine of
endodontology
Publisher
Torsten R. Oemus
oemus@oemus-media.de
CEO
Ingolf Döbbecke
doebbecke@oemus-media.de
Published by
Oemus Media AG
Holbeinstraße 29
04229 Leipzig, Germany
Tel.: +49 341 48474-0
Fax: +49 341 48474-290
kontakt@oemus-media.de
www.oemus.com
Magda Wojtkiewicz, Managing Editor
Printed by
Members of the Board
Jürgen Isbaner
isbaner@oemus-media.de
Lutz V. Hiller
hiller@oemus-media.de
Managing Editor
Magda Wojtkiewicz
m.wojtkiewicz@oemus-media.de
Executive Producer
Gernot Meyer
meyer@oemus-media.de
Designer
Josephine Ritter
j.ritter@oemus-media.de
Copy Editors
Sabrina Raaff
Hans Motschmann
Silber Druck oHG
Am Waldstrauch 1
34266 Niestetal, Germany
Editorial Board
Fernando Goldberg, Argentina
Markus Haapasalo, Canada
Ken Serota, Canada
Clemens Bargholz, Germany
Michael Baumann, Germany
Benjamin Briseno, Germany
Asgeir Sigurdsson, Iceland
Adam Stabholz, Israel
Heike Steffen, Germany
Gary Cheung, Hong Kong
Unni Endal, Norway
Roman Borczyk, Poland
Bartosz Cerkaski, Poland
Esteban Brau, Spain
José Pumarola, Spain
Kishor Gulabivala, United Kingdom
William P. Saunders, United Kingdom
Fred Barnett, USA
L. Stephan Buchanan, USA
Jo Dovgan, USA
Vladimir Gorokhovsky, USA
James Gutmann, USA
Ben Johnson, USA
Kenneth Koch, USA
Sergio Kuttler, USA
John Nusstein, USA
Ove Peters, USA
Jorge Vera, Mexico
Copyright Regulations
_roots international magazine of endodontology is published by Oemus Media AG and will appear in 2014 with one issue every quarter. The magazine
and all articles and illustrations therein are protected by copyright. Any utilisation without the prior consent of editor and publisher is inadmissible and liable
to prosecution. This applies in particular to duplicate copies, translations, microfilms, and storage and processing in electronic systems.
Reproductions, including extracts, may only be made with the permission of the publisher. Given no statement to the contrary, any submissions to the
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check all submitted articles for formal errors and factual authority, and to make amendments if necessary. No responsibility shall be taken for unsolicited
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for information published about associations, companies and commercial markets. All cases of consequential liability arising from inaccurate or faulty
representation are excluded. General terms and conditions apply, legal venue is Leipzig, Germany.
42 I roots
1_ 2014
[43] =>
roots
You can also subscribe via
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would like to subscribe to roots for € 44 including
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[44] =>
Planmeca ProMax 3D
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)
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[page] => 06
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[page] => 10
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[page] => 14
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[6] => Array
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[page] => 18
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[7] => Array
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[title] => Fifth-generation technology in endodontics: The shaping movement
[page] => 22
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[8] => Array
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[page] => 30
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[page] => 38
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/ Editorial
/ Content
/ Mineral trioxide aggregate revisited: A cement for all seasons
/ Apexification withmineral trioxide aggregate (MTA): A case report
/ “A” sequence of irrigation
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/ AmericanAssociation of Endodontists organised Root Canal AwarenessWeek for the seventh time
/ International events
/ Submission guidelines
/ Imprint
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