用于全口义齿计算机辅助设计的虚拟半可调架

Semi-adjustable articulator for computer aided design of complete denture

目的:研究用于全口义齿计算机辅助设计(computer aided design,CAD)的虚拟架程序,并对一例计算机辅助设计的全口义齿进行虚拟调。方法:用FARO多用途3D激光扫描测量臂(美国FARO公司)的接触式测量头获取架开闭口、前伸和侧方运动轨迹数据。在同一扫描坐标系下,利用该扫描臂上集成的线激光扫描仪获取正中关系位时上、下堤唇、颊面三维数据。应用自行开发的全口义齿CAD系统完成一例全口义齿的计算机辅助设计。基于堤扫描数据,将架运动轨迹数据和全口义齿CAD数字模型整合于同一个坐标系。基于Scoll语言开发架三维运动模拟、咬合关系检测和虚拟调程序。结果:开发了用于全口义齿CAD数字模型的虚拟半可调架程序,该程序能自动检测、记录并用颜色梯度显示咬合早接触区、干扰区,并对目标牙齿进行自动调。将该程序应用于1例全口义齿CAD数字模型的虚拟调。结论:该研究基于机械半可调架建立了一条虚拟架的技术路线,并且对在全口义齿CAD过程中应用可调式架进行了初步探讨。

Objective： To explore virtual semi-adjustable articulator for complete denture computer aided design （CAD） system, and to simulate biting motion and virtual occlusal adjustment for a complete denture CAD digital model. Methods： The edentulous jaw casts, rims and bite records of forward protrusion were made in clinic. The casts were fixed to the articulator and inclination of protrusive condylar guidance was set up with bite records of forward protrusion. Inclination of lateral condylar guidance was calculated and set up with Hanus formula. Inclination of protrusive incisal guidance inclination was calculated and set up with ratios of over bite and overjet of complete denture CAD digital model which have been designed with Complete Denture CAD System. The 3D locus data of semi-adjustable articulator was obtained by scanning three points on articulator with contact head of FARO ScanArm （ FARO Technologies Inc. , American）. In the same scanning coordinate system, the laser scanner was used to get labial/ buccal surface data of rims at centric relation position. Based on rims, the coordinate system was set up and the complete denture CAD model was aligned to the locus data. The virtual articulator program was explored with Scoll language offered by Imageware （ EDS corp. , American）. The 3 D biting motion simulating, automatic occluding relation detection and automatic occlusal adjustment functions were supported by the program. Results： A virtual semi-adjustable articulator program for Complete Denture CAD System was explored and applied to a complete denture CAD digital model. With the program, 3D biting motion simulating, automatic occluding relation detection and automatic occlusal adjustment can be realized. Conclusion： A technical route of virtual articulator is set up based on semi-adjustable articulator and initial approach is carried out for application of the virtual articulator in CAD progress of complete denture.