Division of Computer Restorations, Department of Preventive Dentistry, Cariology, and Periodontology, Center for Dental and Oral Medicine, University of Zürich, Zürich, Switzerland.
Clin Oral Investig. 2011 Apr;15(2):283-9. doi: 10.1007/s00784-010-0384-z. Epub 2010 Feb 9.
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.
“生物通用牙模型”可用于计算机辅助设计（CAD）牙科修复体的咬合面。从数字 3D 数据中，它可以自动检索与预备后天然表面匹配的形态。本研究评估了该方法在生成匹配良好且调整良好的 CAD/计算机辅助制造（CAM）制作的部分冠方面的潜力。将 12 个带有部分冠预备体的模型安装到牙颌模型上。部分冠通过 Cerec 3D CAD 软件基于生物通用牙模型（Biog.CAD）进行设计，并且为了对照，通过传统的基于数据的 Cerec 3D CAD 软件（Conv.CAD）进行设计。测量了设计时间，并通过视觉评估形态的自然度。修复体被铣削、粘接到模型上，并测量垂直差异和最终咬合调整的时间。Biog.CAD 软件在设计部分冠时提供了更高的自然度（高达 225 至 11 分），比 Conv.CAD 软件快 251（±78）秒（p <0.01）。垂直差异，Conv.CAD 为 0.52（±0.28）mm，Biog.CAD 为 0.46（±0.19）mm，咬合调整时间，Conv.CAD 为 118（±132）s，Biog.CAD 为 102（±77）s，差异无统计学意义。总之，与传统的交互式 CAD 软件相比，生物通用牙模型能够以全自动的方式生成具有更高自然度的部分冠的咬合形态。
