Efficiency of a mathematical model in generating CAD/CAM-partial crowns with natural tooth morphology
| Autor: | Andreas Ender, Werner H. Mörmann, Albert Mehl |
|---|---|
| Přispěvatelé: | University of Zurich, Ender, A |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Adult
Male Time Factors Adolescent Articulator Occlusal Adjustment Dentistry CAD 610 Medicine & health computer.software_genre Statistics Nonparametric Young Adult Software Dental porcelain CEREC stomatognathic system Surveys and Questionnaires 10066 Clinic of Conservative and Preventive Dentistry Computer Aided Design Humans cardiovascular diseases General Dentistry Mathematics Crowns business.industry Vertical Dimension Models Theoretical Tooth Preparation Prosthodontic Dental Porcelain 3500 General Dentistry Models Dental stomatognathic diseases Dental Prosthesis Design Linear Models Computer-Aided Design Female Partial Crown business computer |
| DOI: | 10.5167/uzh-43925 |
| Popis: | The “biogeneric tooth model” can be used for computer-aided design (CAD) of the occlusal surface of dental restorations. From digital 3D-data, it automatically retrieves a morphology matching the natural surface left after preparation. This study evaluates the potential of this method for generating well-matched and well-adjusted CAD/computer-aided manufacturing (CAM) fabricated partial crowns. Twelve models with partial crown preparations were mounted into an articulator. Partial crowns were designed with the Cerec 3D CAD software based on the biogeneric tooth model (Biog.CAD) and, for control, with a conventional data-based Cerec 3D CAD software (Conv.CAD). The design time was measured, and the naturalness of the morphology was visually assessed. The restorations were milled, cemented on the models, and the vertical discrepancy and the time for final occlusal adjustment were measured. The Biog.CAD software offered a significantly higher naturalness (up to 225 to 11 scores) and was significantly faster by 251 (±78) s in designing partial crowns (p < 0.01) compared to Conv.CAD software. Vertical discrepancy, 0.52 (±0.28) mm for Conv.CAD and 0.46 (±0.19) mm for Biog.CAD, and occlusal adjustment time, 118 (±132) s for Conv.CAD and 102 (±77) s for Biog.CAD, did not differ significantly. In conclusion, the biogeneric tooth model is able to generate occlusal morphology of partial crowns in a fully automated process with higher naturalness compared to conventional interactive CAD software. |
| Databáze: | OpenAIRE |
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