可摘局部义齿支架铸型的计算机辅助设计与制作

Computer aided design and computer aided manufacture of sacrificial pattern of removable partial denture framework

目的通过对Kennedy第二类第二亚类牙列缺损模型进行可摘局部义齿支架的计算机辅助设计与制作,探索可行的方案,为该课题的深入研究奠定基础。方法激光扫描获取Kennedy第二类第二亚类牙列缺损石膏模型的三维数据,在重建的牙颌三维数字模型上绘出支架的轮廓图,提取轮廓内的数据作为支架的组织面数据,通过抽壳等操作得到支架的三维模型。将数据导入快速成形设备,加工成形。结果初步实现了可摘局部义齿支架的计算机辅助设计,用快速成形机加工出支架树脂铸型。结论将激光扫描获取数据、计算机辅助设计三维构建至快速成形机制作出产品作为一整套方案,可初步实现可摘局部义齿支架的计算机辅助设计与制作。

Objective To introduce a method applied in computer aided design and computer aided manufacture （CAD-CAM） of removable partial denture framework for rehabilitating edentulous arch of Kennedy Class Ⅱ and found a basis for this project. Methods Point cloud data of dental stone model was obtained by laser scanning. The following processes were made： drawing framework outline on the reconstructed triangle mesh model ,picking up and processing its inner side data as the data of tissue surface, shelling it for 3-D model of framework, and transferring the data to rapid prototyping equipment for manufacture. Results 3-D model of the removable partial denture framework was preliminarily accomplished. The resin framework used as a sacrificial pattern was manufactured with the rapid prototyping equipment. The fit between resin framework and plaster model was good. Conclusions This method, as an integrated procedure including data acquisition, 3-D computer modeling and fabrication by rapid prototyping, is feasible to implement CAD-CAM of removable partial denture framework.