基于牙齿根桩印模三维扫描重建的根桩模型精度分析  

Accuracy analysis of reconstructed post model from dental post impression digitization

作　　者：陈志宇[1] 李雅[2] 卫绪懿[1] 邓旭亮[1] 王新知[1] 

机构地区：[1]北京大学口腔医学院,北京100081 [2]石家庄市第一医院,石家庄050011

出　　处：《中国科技论文》2013年第4期350-354,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20090001110099)

摘　　要：对比常规间接桩核蜡型三维扫描数据,分析根桩印模直接扫描并重建根桩模型的精度。首先制作30颗牙齿的体外缺损模型,模拟临床制取局部闭口式硅橡胶根桩印模后,再通过三维光学扫描重建根桩三维模型,利用Geomagic Qualify 12.0软件的最佳拟合配准功能,通过检测印模重复扫描的误差,分析三维扫描方法的精确度,将每颗牙齿的印模扫描与间接蜡型扫描分别重建的根桩模型做对比,对根桩印模扫描方法重建根桩模型的准确度进行了分析。结果显示,根桩印模三维光学重复扫描误差均值小于10μm,印模与蜡型扫描重建的根桩模型间差异范围为25.86～40.03μm,结果表明根桩印模三维扫描的精度满足修复临床精度要求,可以应用于临床实践。The three-dimensional digitization accuracy of dental post impression was analyzed by comparing with conventional post and core waxpattern digitization. A total of 30 prepared teeth requiring post restorations were made, sectional dual arch vinyl polysiloxane impression was taken for each tooth and digitized with an optical scanner. By best-fit alignment of Geomagic Qualify 12.0, the precision of post impression digitization was first evaluated through analyzing repetitive scanning error, and the accura- cy of post impression digitization was then investigated by comparing 3D post models of each tooth from impression with wax-pat tern digitization. Results show that the mean repetitive error of digitization is limited to ~0 t^m, and the average deviations be tween post models from impression and wax pattern digitization range from 25. 86--40. 03 txm, which is clinically accep＊able, suggesting that optical digitization accuracy of post impressions is suitable for clinical aDnlication_

关 键 词：计算机辅助设计与制作 根桩印模 最佳拟合配准 三维扫描精度 

分 类 号：R783[医药卫生—口腔医学] TP391.41[医药卫生—临床医学]