Please activate JavaScript!
Please install Adobe Flash Player, click here for download
ePaper created 2016-11-03, 14:26:44 | version 1.38.0
16 Dental Tribune Asia Pacific Edition | 10/2016 TRENDS & APPLICATIONS functional border moulding. For this purpose, the material was ap- plied to the margins of the maxil- lary plate. Once the plate had been seated in the oral cavity, the mus- cles were activated. Next, an adhesive varnish (Vir- tual Tray Adhesive) was dispensed on to the inner surface of the tray. Once dried, Virtual Light Body im- pression material was applied and the 3-D bite plate was seated in the mouth (Fig. 8). The patient was asked to carefully close against the opposing jaw. After that, the UTS CAD appliance was used to check the parallelism of the occlusal plane to the BP and CP. In order to determine the maxillomandibular relation, a Gnathometer CAD was used. This appliance is designed for taking needlepoint tracing records in edentulous patients. The bite rim supports were removed and the Gnathometer CAD mounted. Col- ouring material (crayon, felt tip pen) was applied to the lower reg- istration plate and the patient was askedtoperformretrusive,protru- sive and lateral movements. The colouredregistrationplateshowed the typical gothic arch tracing re- cord produced by the tracing sty- lus. The perforation of the fixing plate was aligned with the arrow head of the arch (centric relation) and secured in position. The patient was asked to oc- clude. This allowed us to check that the centric relation had been established correctly (Fig. 9). The 3-D maxilla-mandibular record can be immobilised with a suit- able material (e.g. CADbite, Ivoclar Vivadent). Finally, the patient’s aesthetic lines (midline, canine– canine line, smile line, lip closure line) were marked on the record. The immobilised record was then forwarded to the laboratory, to- gether with information about the tooth selection and CP and BP values. In the laboratory, both sides of the record were digitised in their exact position using the denture scan holder (3Shape; Fig. 10). The digitised jaw models were aligned with each other on the basis of the registered relations, and the occlu- sal plane was established using the data captured with the UTS CAD. The dental technician defined the extension of the denture and se- lected an appropriate tooth mould from a software library of denture teeth (Fig. 11). The Digital Denture Profes- sional add-on contains several examples of functional set-ups for select Ivoclar Vivadent and CANDULOR denture teeth, saving considerable time. The functional parameters and mandibular dy- namics can be verified in a virtual articulator similar to the Stratos 300 (Ivoclar Vivadent) and possi- ble interferences can be identified. Third appointment A third appointment is purely optional. In this case, a prototype was tried in on the patient to check the aesthetics, phonetics and func- tion of the prospective final den- tures (Fig. 12). Fine adjustments, such as corrections to the midline and reduction of the vertical di- mension, were communicated to the laboratory. There, the denture design was approved for CNC pro- duction. A transfer template was computed automatically to facili- tate the correct placement of the denture teeth. The CNC milling machine then finished the den- ture bases. The dentures were re- moved from the disc and polished (Fig. 13). Fourth appointment Intra-oral evaluation of the complete dentures and subse- quent modifications were carried out in the same way as the proce- dures for conventional dentures. Hardly any alterations were neces- sary in this case. The dentures pro- vided a secure and reliable fit and harmoniously integrated into the patient’s overall facial appearance (Fig. 14). Conclusion Scanning technologies, com- bined with CAD/CAM processes, substantially reduce the workload associated with the fabrication of complete dentures. Virtual set-up and design facilities (CAD) and denture milling procedures (CAM) eliminate the lengthy processes in- volved in model articulation and flasking. As polymerisation shrink- age does not occur, the dentures exhibit a high accuracy of fit. The system described in this report meets the demographic and economic requirements for the production of straightforward, fast, cost-effective and high-quality dentures for edentulous patients. Pasquale Laca- sella is a den- tal technician a t A p u l i a Digital Lab in Bari. He can be contacted at lacasella@ apuliadigitalab.it. Dr Piero Venezia is a practising dentist at Stu- dio Cavalcanti and Venezia in Bari in Ita- ly. He can be contacted at info@studiocavalcantivenezia.it. www.dental-tribune.com The Dental Tribune International Magazines Shipping Address Name Address Zip Code, City Country E-mail Date, Signature PayPal Credit Card Credit Card Number Expiration Date Security Code CAD/CAM Clinical Masters* cosmetic dentistry** implants laser ortho** roots Journal of Oral Science & Rehabilitation*** Fax: +49 341 48474 173 E-mail: subscriptions@dental-tribune.com EUR 44 per year (4 issues per year; incl. shipping and VAT for customers in Germany) and EUR 46 per year (4 issues per year; incl. shipping for customers outside Germany). * EUR 12 per year (1 issue per year; incl. shipping and VAT for customers in Germany) and EUR 14 per year (1 issue per year; incl. shipping for customers outside Germany). ** EUR 22 per year (2 issues per year; incl. shipping and VAT for customers in Germany) and EUR 23 per year (2 issues per year; incl. shipping for customers outside Germany). *** EUR 200 per year (4 issues per year; incl. shipping and VAT). Your subscription will be renewed automatically every year until a written cancellation is sent to Dental Tribune International GmbH, Holbeinstr. 29, 04229 Leipzig, Germany, six weeks prior to the renewal date. I would like to subscribe to SUBSCRIBE NOW! AD 14 12 13 Fig. 12: Try-in of the prototype to check the functional parameters.—Fig. 13: Complete dentures created with CAD/CAM. —Fig. 14: The patient is visibly happy with her digitally produced set of dentures. “Scanning technologies, combined with CAD/CAM processes, substantially reduce the workload associated with the fabrication of complete dentures.” Fax: +4934148474173 1213