个性化桩核修复体计算机辅助设计初探  

Three-dimensional computer aided design for individualized post-and-core restoration

作　　者：顾晓宇[1] 王亚平[2] 王勇[1] 吕培军[1] 

机构地区：[1]北京大学口腔医学院口腔医院卫生部口腔医学计算机应用工程技术研究中心,北京100081 [2]北京航空航天大学机械工程及自动化学院

出　　处：《中华口腔医学杂志》2009年第10期629-633,共5页Chinese Journal of Stomatology

摘　　要：目的探索桩核修复体的计算机辅助设计（CAD）路线，确定合适的三维设计方法，以期为桩核修复体的计算机辅助制作（CAM）提供必要的前提。方法制作1副含有离体牙的石膏模型，在牙体预备后用层析成像技术获取三维数字模型。根据桩核修复体的临床设计原则，在正向工程软件唐龙CAD-CAM口腔修复系统的平台上，利用三维点云、曲线和曲面的编辑工具，分别完成桩的根管部分、桩的髓腔部分和核的设计。根据前牙、前磨牙和磨牙桩核修复体的不同形态要求对各曲面进行连接、裁剪等操作，形成修复体的三维形态。结果完成了14个牙位桩核修复体的三维设计，其与扫描得到的三维数字模型贴合良好，具有良好的固位形，同时可为最终全冠修复体提供充足的修复空间。结论本项研究设计的桩核修复体的三维形态符合临床要求，可用于桩核修复体CAM。Objective To develop a method of three-dimensional computer aided design （CAD） of post-and-core restoration. Methods Two plaster casts with extracted natural teeth were used in this study. The extracted teeth were prepared and scanned using tomography method to obtain three-dimensional digitalized models. According to the basic rules of post-and-core design, posts, cores and cavity surfaces of the teeth were designed using the tools for processing point clouds, curves and surfaces on the forward engineering software of Tanglong prosthodontic system. Then three-dimensional figures of the final restorations were corrected according to the configurations of anterior teeth, premolars and molars respectively. Results Computer aided design of 14 post-and-core restorations were finished, and good fitness between the restoration and the three-dimensional digital models were obtained. Appropriate retention forms and enough spaces for the full crown restoratiohs can be obtained through this method. Conclusions The CAD of three-dimensional figures of the post-and-core restorations can fulfill clinical requirements. Therefore they can be used in computer-aided manufacture（CAM） of post-and-core restorations.

关 键 词：桩核技术 计算机辅助设计 正向工程 

分 类 号：R686[医药卫生—骨科学]