烤瓷固定桥支架的计算机辅助设计与制造  

Computer Aided Design and Manufacturing of the Framework of PFM Fixed Bridge

作　　者：安涛[1] 廖文和[1] 俞青[2] 戴宁[1] 吕培军[3] 王勇[3] 

机构地区：[1]南京航空航天大学357信箱,南京210016 [2]南京市口腔医院修复科,南京210008 [3]北京大学口腔医学院,北京100081

出　　处：《生物医学工程学杂志》2008年第2期235-240,共6页Journal of Biomedical Engineering

基　　金：国家高技术研究发展计划(863计划)资助(2005AA420240);江苏省科技攻关项目资助(BE2005014);南京市科技发展计划项目资助(200504022);南京市医学科技发展计划项目资助(ZKX0420)

摘　　要：对烤瓷固定桥支架的计算机辅助设计与加工方法进行探讨和研究。以下颌第一磨牙缺失为例,首先使用ATOS II光学测量仪进行桥基牙表面数据采集,利用所得数据设计两侧内冠;其次从标准桥体数据库中调入相应的标准桥体,先对其做变形设计,再利用基于约束线和约束面的定位方法将桥体自动定位;最后采用基于面积驱动的算法设计连接体把内冠和桥体连接起来。设计完成后利用3轴数控精雕机床进行铣削编程加工。经检测,加工出的烤瓷固定桥支架能够与桥基牙紧密贴合,连接体强度及整体设计精度均符合临床要求。采用计算机辅助设计与制造(CAD/CAM)方法制作烤瓷固定桥支架具有高效、准确、稳定等优点,具有临床实用价值,为国产口腔修复CAD系统的研制提供了第一手的资料。We have carried out a research on the method for Computer Aided Design and Manufacturing （ CAD/ CAM） of the framework of porcelain-fused-to-metal（PFM） fixed bridge. Taking the missing of the mandibular first molar as an example, firstly, we used ATOS II 3D scanner to collect the 3D data of the abutment teeth and used the acquried data to design the coping crowns. Secondly, the relevant standard bridge was selected from the standard bridges database and was deformed inaccordance to the characteristic of the patient. Then it was set to the correct position between the coping crowns automatically based on the restricting lines and faces. Finally, the connector was designed to connect the coping crowns and the bridge based on the touching area. The final product was manufactured by 3-axis NC milling ma- chine. The results of examination showed that the framework of PFM fixed bridge fitted the abutment teeth very well, and the hardness of the connector and the precision of the whole model were feasible and reasonable. The method of designing and manufacturing the framework of PFM fixed bridge from CAD/CAM is practicable, efficient and accurate. It is also an important part of homemade dental CAD/CAM system.

关 键 词：口腔修复 烤瓷固定桥支架 计算机辅助设计与制造 数控加工 

分 类 号：R783[医药卫生—口腔医学]