基于逆向工程技术的嵌体计算机辅助设计

目的 运用逆向工程软件进行嵌体计算机辅助设计(CAD)，探讨符合生理要求的嵌体He面与邻面的CAD方法，为嵌体专用CAD平台的开发提供方法学基础。方法 取一个别正常He自愿者牙颌超硬石膏模型，在模型上牙体预备G．V．Black Ⅰ类洞、Ⅱ类洞、Ⅵ类(MOD)洞嵌体洞型，以牙科自凝树脂取牙尖交错位(ICP)He记录与模拟功能性He记录(FGP)。在同一坐标系下采集预备体、邻牙及He记录数字印模。运用逆向工程软件进行数据处理，同时结合标准牙数据库完成CAD。结果 在逆向工程软件基础上确立了嵌体CAD的技术路线，CAD完成后的各类型后牙嵌体形态协调美观，表面光滑，咬合及邻接关系符合生理要求。结论 基于通用逆向工程软件二次开发构建的嵌体CAD专用平台，是一种可行的方法。

The inlay computer aided design based on reverse engineering technology

OBJECTIVE: This study was to explore a CAD method for constructing occlusal and proximal surfaces of inlays using reverse engineering (RE) software and to develop a CAD software for the inlay fabrication. METHODS: The dentition model of a volunteer with individual normal occlusion was scanned with a 3D mechanical scanner. The scanned objects were prepared teeth with G. V. Black class I, class II and class VI (MOD) cavities, neighbor teeth, intercuspal position (ICP) record, and functional bite record (or functional generate path, FGP). Inlays were constructed based on RE technology using the database of Chinese normal teeth. RESULTS: The technique guideline of inlay CAD was developed based on RE softwares. Inlays designed with CAD technique showed smooth and continuous contours. The occlusal and proximal contacts of inlay met physiologic demands. CONCLUSIONS: It is a feasible method to develop a CAD software for inlay fabrication based on RE software.