Lab Tribune Middle East & Africa No. 4, 2021
“Dental technology advances dentistry” / Fully digital workflow with a twist
“Dental technology advances dentistry” / Fully digital workflow with a twist
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Vol.11_LT.indd NL Y O LS NA IO SS FE O PR NT AL DE Published in Dubai www.dental-tribune.me July-August 2021 | No. 4, Vol. 11 “Dental technology advances dentistry” By Iveta Ramonaite, Dental Tribune International With its transformative power, digital dentistry is slowly taking over dental practices and laboratories all around the world. In this interview, prosthodontist Dr Ryan C. Lewis talks about how digital dentistry can help improve workflow efficiency and highlights some of the latest advancements in digital dentistry. Dr Lewis, digital technologies are being taken up in dental practices worldwide. In your opinion, is it still possible to imagine dentistry without them? Dental technology advances dentistry by increasing communication, efficiency and accuracy. The most important technologies that I currently utilise are CAD/CAM milling, intra-oral scanning, digital implant planning, 3D printing and photography. We initially integrate digital technology with CAD/CAM milling abutments and digitally design restorations. If we compare this to UCLA casting abutments and hand waxing porcelain-fused-to-metal restorations, we do not only save significantly on our gold costs, but we are also able to increase the efficiency of fabricating the restorations. If we then consider intra-oral scanning and the ability to digitally submit cases to the laboratory, plus the savings in impression material, shipping costs, time to ship, and cases getting lost or delayed in shipping, it is easy to appreciate the benefits that digital dentistry offers. All of my implant cases are now digitally planned. After using digital planning and fully guided surgery, my surgeon no longer wants to place implants the traditional way. It provides peace of mind knowing that the implant will be positioned ideally, the referring doctor will be happy with the work and the patient will have the desired outcome. laboratory perspective, it is a great tool to utilise. For many dentists, the new technology changes their workflow significantly and takes time to integrate into their traditional workflow. Because of this and the startup costs, it is difficult to switch to digital dentistry when using a traditional pathway has brought success in the past. However, as in my practice, once the digital pathways have been integrated, going back to a traditional one would increase overhead and decrease efficiency significantly. 3D printing has changed the way that we produce surgical guides. 3D printers have become so accurate and inexpensive that any dentist can now afford to have them in his or her office and print surgical guides as well as casts for diagnostic purposes or aligners at a relatively low cost. Additionally, photography has become essential when communicating with my dental technicians. The accuracy and quality of my restorations would suffer significantly without it. What are some of the latest, most notable advances in digital dentistry? Digital implant treatment planning, intra-oral scanning and 3D printing. With digital implant treatment planning, we can significantly improve the accuracy of our implant position. We now can integrate facial scans and intra- oral scans without fullarch digital wax-ups. This ensures that we are accurately planning our new tooth positions. Because our digital diagnostic wax-ups are so accurate, we can also plan our full-arch implant positions with confidence. This allows us to place implants immediately at the time of extraction in cases where we would have previously recommended extraction of teeth and healing first. 3D printing is now very predictable and accurate. It allows us to print the surgical guides in the office without worry or concern about the accuracy of the guide. My full-arch immediate How has the SARS-CoV-2 pandemic changed your view, or that of your colleagues, on the relevance of digital dentistry and the importance of adopting digital solutions? The pandemic has highlighted the potential contamination risks associated with transferring impressions or other components from the patient to the laboratory. Intra-oral scanning offers the safest solution, the one with the least risk of crosscontamination. Unfortunately, this is a problem that is likely not going to go away any time soon, so this is great not only now, but also as we move forward into the future. Dr Ryan C. Lewis, a prosthodontist and owner of Longmont Prosthodontics load provisionals are printed on the same printer as my surgical guides. Dental laboratories seem more ready and willing to adopt digital solutions compared with dental clinics. How do you think this could be explained? Digital technology greatly increases the efficiency of the technician. This decreases overhead expenses and treatment costs. It also increases the accuracy of the restorations. Many laboratories now report that digitally designed and milled crowns provide the lowest number of remakes by percentage out of any product they offer. Typically, these are modeless crowns that are manufactured without a printed or stone cast. From the Editorial note: The webinar, titled “Advancements in contemporary digital dentistry,” is available on demand at Straumann Campus (https://campuslive.straumann.com). The registration is free of charge. AD www.cappmea.com/dtim-2021[2] =>DTMEA_No.4. Vol.11_LT.indd B2 LAB TRIBUNE Dental Tribune Middle East & Africa Edition | 4/2021 Fully digital workflow with a twist By Dr Marco Tudts & Bob Bosman Elst, Belgium A 61-year-old male patient presented suffering from severe tooth wear, which can be classified as attrition, abrasion or erosion depending on its cause. The entire smile line had been lost and even became negative (Fig. 1). The patient was an extrovert, and hence a new nice smile would impact his social life positively. The destructive wear of his teeth had already caused several endodontic treatments and temporomandibular joint dysfunction caused by the loss of the vertical dimension and resulting in tense and tired muscles. Severe tooth wear had caused morphological change of occlusal tooth, decrease of vertical dimension, pulp pathology, occlusal disharmony and changed masticatory function. In this condition, more complex therapies are needed, such as endodontics, periodontics and full coronal coverage. A digital impression was taken, and the master model was printed. A digital wax-up/mock-up was made in exocad DentalCAD (exocad) using the Smile Creator module. A standard length of 10.8mm and width of 8.4 mm was used, as described by Mauro Fradeani. Fig. 1: Smile before the treatment. This set-up was a really nice starting point for this patient’s biotype. The idea was to verify the integration because the vertical dimension had to be increased by several millimetres and the patient wanted to rejuvenate his smile inconspicuously, as naturally as possible, in addition to all the comfort of a balanced occlusion. This digital wax-up/mock-up was printed in GC Temp PRINT (GC) as veneers so that it could be placed in front of the teeth (Fig. 2); a small support towards the palatal side was present so that it could be placed over the natural dentition in a sta- Fig. 2: Mock-up (GC Temp PRINT, GC) in the mouth. ble manner. This made it possible to evaluate both the aesthetics and the musculature’s response to the new occlusal height. The patient could also take this printed wax-up home, giving him the opportunity to show it to his partner, but also to check it for himself in his own private space and without any time pressure or pressure from strangers. Having his or her smile remodelled is something really drastic, so the patient should be given as much time as he or she needs with all the possible tools. After the patient’s consent had been obtained, it was possible to proceed with the treatment plan: the veneers were adapted in DentalCAD and printed again as temporary crowns (GC Temp PRINT, light shade). These crowns were relined with G-ænial Universal Injectable composite (Shade A2, GC; Fig. 3a) and manually polished. Optionally, they could have been glazed with OPTIGLAZE colour (GC). The cervical border was sandblasted (50 μm is sufficient) so that it could be easily connected to the composite and then only the relined part had to be polished again (Fig. 3b). The vertical dimension was increased by 8 mm. To ensure that this would be comfortable for the patient, three months were taken to revise the situation. The patient suffered no headaches, muscle stress or any other problems. Hence, the first phase of the aesthetic adaptation was begun. Minor gingivectomy with bone correction was carried out ÿPage B3 Fig.3a: Printed temporary restorations relined with G-ænial Universal Injectable (GC). Fig.3b: Temporary restorations in the mouth after relining with G-ænial Universal Injectable. Fig. 4: Smile with the provisional restorations in zirconia, characterised with GC Initial IQ Lustre Pastes NF (GC). Fig.5a: Putty key on the provisional restorations. Fig.5b: Putty key on the substructure. Fig. 6a: Wash firing: GC Initial IQ Lustre Pastes NF. Fig. 6b: Wash firing: GC Initial IQ Lustre Pastes NF, sprinkled with GC Initial IQ Lustre Pastes NF CL-F (anterior). Fig. 6c: Wash firing: GC Initial IQ Lustre Pastes NF (posterior).[3] =>DTMEA_No.4. Vol.11_LT.indd B3 LAB TRIBUNE Dental Tribune Middle East & Africa Edition | 4/2021 ◊Page B2 first. An impression was taken, and long-term provisional restorations were manufactured in full zirconia. Those were characterised with GC Initial IQ Lustre Pastes NF (GC) and cemented temporarily (Fig. 4). A recall was planned for three months later. This period also allowed the soft and hard tissue to heal properly after the periodontal surgery. At that point, definitive work could begin; however, owing to a skiing accident, the definitive impression needed to be postponed for another three months. This did not pose a Fig.7: Creation of the neck. Fig.8: After application of the dentine material, the horizontal line was checked with the putty key. Fig.9a: Mamelons and cervical surfaces: 50% FD-91 + 50% DA2 (green), A1 (dark pink), 50% A1 + 50% E58 (blue). Fig.9b: The enamel blocker (50% A1 + 50% E58; blue) was also used on the cervical part. Fig. 10: Central incisor with GC Initial IQ Lustre Pastes NF CL-F. Fig. 12: Enamel firing. Fig. 11: Colour firing with GC Initial IQ Lustre Pastes NF CL-F. Figs. 13a: Correction firing. Figs. 13b: Correction firing. Fig. 14a: Restorations before polishing. Figs. 13a: Correction firing. Figs. 13b: Correction firing. Fig. 14a: Restorations before polishing. problem because of the highly durable provisional restorations. However, a digital impression could have been used as well. For cases like this, the comfort of the patient is always the priority. Hence, after six months, the definitive impressions were taken, both digitally and conventionally. The conventional impression was used to create the master working model. This was mostly due to familiarity with the procedure. We feel that what we are men- tally comfortable with will also yield the best possible end result. For the substructure, multilayered zirconia (Shade A2) was used. The design was a small, adapted copy of the provisional restorations. A 0.4 mm buccal cut-back was done for the posterior teeth and the canines. For the four anterior teeth, a 0.6 mm cut-back was done and the incisal height was decreased by 0.4 mm. To maintain control of the horizon- tal line, a palatal putty index of the provisional restorations was made for use as a key during the ceramic build-up (Figs. 5a & b). opportunity to sandblast after the wash firing without damaging the colour. Moreover, it ensured that the colours would not slip down. The zirconia substructure was slightly adapted and went into the furnace for a regeneration firing. Thereafter, the workflow continued with the wash firing. After application of the GC Initial IQ Lustre Pastes NF (Fig. 6a), the Initial CL-F (Clear Fluorescence) powder was sprinkled on top of the wet paste (Figs. 6b & c). This gave the Zirconia does not absorb heat well, and the heat must be carefully adjusted to avoid chipping. The problem of chipping is also a consequence of poor adjustment of the heating program. The larger the volume of zirconia, the slower the heating up and cooling down should take place. In this case, the heating temperature was dropped by 30°C per minute, and the cooling down should have a similar rate. To keep it simple: the time to heat up should be more or less the same as the cooling down. The part until the CL-F was the first layer. For the neck, IN-42 (Terracotta; 40%) was used with A2 (60%), and then the main colour was A2 (Fig. 7). After applying DA2 to the ÿPage B4[4] =>DTMEA_No.4. Vol.11_LT.indd B4 LAB TRIBUNE Dental Tribune Middle East & Africa Edition | 4/2021 ◊Page B3 full contour (Dentin A2), the horizontal line was checked with the putty key (Fig. 8). After the cut-back, the mamelons were shaped. FD-91 (Fluo Dentin Light; 50%) with DA2 (50%), A1, and A1 (50%) with E58 (Enamel; 50%) were alternated, as shown in Figures 9a & b. About the authors: Bob Bosman Elst He graduated in 1991 as a dental technician. While working at his own independent dental laboratory in Belgium, he has continuously been working on expansion and developing innovative techniques for the dental industry. Over the years, he has participated in more than 40 master courses, including those by Brüsch, Tyszko, Cagaro, Adolfi, Galle, Hegenbarth, Sieber and Polansky, either as a lecturer or as an active participant. His work has been recognised by many in the field. In 2007, Elst won the third prize (in the Young Ceramics category) during the world tour of Nobel Biocare in Las Vegas in the US. He came in as the first European of all the participants in this highly reputable event. He set up a help desk for dentists, covering all aspects of implant-supported restorations and porcelain. In 2017, he became a trainer of the GC Europe Campus, where he found the perfect forum for sharing his passion and experience. In the cervical part, this mixture was also used. This mixture could be called an enamel blocker; it works as a softer transmitter of the colour. This mixture can also be used as a transition towards the enamel in the incisal third; however, in this case, it was used as a softer, lighter cervical part. It is all about breaking the light with a chameleon effect inside the material. If the mamelons are to be clearly distinguished from the dentine material, CL-F should be applied on top of the mamelons (Fig. 10). For floating mamelons, a wall of CL-F is applied to the cut-back, then the mamelons are created and then again a layer of CL-F is applied. In this case, it was chosen to have the mamelons differentiated from the dentine material. This first bake is the colour firing (Fig. 11); if the colour is not chromatic enough or already too chromatic, it is easier to adapt in this phase. After application of the enamel material, colours should no longer be adapted because this will destroy the appearance, which could become very greyish. The enamel firing could be considered the morphological firing. For the enamel, a mixture of E58, EI-14 (Enamel Intensive Yellow) and EOP Booster in three equal parts was used (Fig. 12). The program was exactly the same as for the colour firing. Fig. 18: Final result, portrait. The patient was satisfied with the aesthetics and function of his new smile. Fig. 17: Night guard to protect the restorations and periodontal tissue. The correction firing was done with the same mixture, but diluted with a fourth part of CL-F (Fig. 13). The temperature was dropped by 5°C. In case another firing is necessary, the temperature can be dropped by an extra 2 °C. After finishing of the structure, the crown was glazed with just some liquid, at 50°C lower than normal. The intention was to seal the sur- face. After this firing, the crowns were hand polished with a mixture of pumice and 50 μm aluminium oxide (Fig. 14). The preparations were cleaned and isolated with retraction cords (Fig. 15). The crowns were cemented with a resin-modified glass ionomer (GC Fuji PLUS CAPSULE, GC). The cement excess was easily removed when the rubbery state was reached, and margins were polished. Increasing the vertical dimension is often a challenging task. The temporisation phase was used to evaluate the influence of the increase on the temporomandibular function. Aside from the function, restoring the vertical dimension had a positive influence on the aesthetic appearance. After treatment, a better balance in the facial dimensions as well as a fuller, more youthful smile could be seen (Figs. 16–18). Editorial note: This articles was published in CAD/ CAM—international magazine of dental laboratories vol. 12, issue 1/2021. Dr Marco Tudts He graduated as a dentist from KU Leuven in Belgium in 1991 and completed his postgraduate qualification in aesthetic and prosthetic dentistry in 1994. For 12 years, he was a part-time associate at KU Leuven, complex rehabilitation being his major research topic, and participated in various multicentre studies. In 1996, he started a multidisciplinary private practice, specialised in complex rehabilitation, which he is still running. In 2004, he obtained an MSc in dental implantology from Montefiore Medical Center in New York in the US. In 2008, he opened a look-over-shoulder training facility for dentists focusing on implantology, 3D technology, CAD/CAM and 3D guided surgery. He is the developer of the Navigator System for guided surgery (Zimmer Biomet Dental). Since 2015, he has been a staff member in the Department ofOral Health Sciences at Ghent University in Belgium. Here, he is currently preparing his PhD dissertation on 3D-guided surgery under Prof. H. De Bruyn. AD SUBSCRIBE NOW DTI—international magazine subscriptions Read premium content at your leisure Browse all specialty magazine titles and subscribe to your print editions or e-papers using the above QR code or at: www.dental-tribune.com/shop) [page_count] => 4 [pdf_ping_data] => Array ( [page_count] => 4 [format] => PDF [width] => 808 [height] => 1191 [colorspace] => COLORSPACE_UNDEFINED ) [linked_companies] => Array ( [ids] => Array ( ) ) [cover_url] => [cover_three] => [cover] => [toc] => Array ( [0] => Array ( [title] => “Dental technology advances dentistry” [page] => 1 ) [1] => Array ( [title] => Fully digital workflow with a twist [page] => 2 ) ) [toc_html] =>[toc_titles] =>Table of contents“Dental technology advances dentistry” / Fully digital workflow with a twist
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