数字化三维牙颌模型中牙齿边界的自动提取  

Automatic extraction of tooth-boundary in digital three-dimensional dental cast

作　　者：李剑[1] 严斌[2] 王林[2] 张文健[2] 鲍旭东[1] 赵孟[1] 

机构地区：[1]东南大学影像科学与技术实验室,南京210096 [2]南京医科大学口腔医学研究所

出　　处：《口腔医学》2008年第7期347-349,共3页Stomatology

基　　金：南京医科大学科技发展基金项目(NY04026)

摘　　要：目的在计算机辅助口腔正畸治疗的软件设计中实现对牙齿边界的自动提取。方法首先,对获取的数字化牙颌模型STL文件进行分析,针对后期处理的需要设计出拓扑重建后的数据结构;然后,通过对牙颌模型的三角网格离散曲率的估算获得初步提取的边界;最终,根据牙齿轮廓的特点提出一种修正方法,经修正后完成对牙齿边界的自动提取。结果自动提取出的牙齿边界线已基本符合实际需要。结论对数字化牙颌模型进行自动边界提取是可行的,并能提高牙齿分割的效率和精度。Objective To develop a solution of the automatic extraction of the tooth-boundary in digital three-dimensional dental cast. Meth- ods Firstly, for the need of post-processing, topological reconstruction for STL file are presented on the basis of analyzing the properties of the STL file. Then, the tooth-boundary is extracted roughly according to the discrete curvature estimation of the triangular mesh. Finally, the tooth-boundary is corrected according to the shape feature of the dental cast. Results The tooth-boundary can meet the actual needs. Conclu- sion The automatic extraction of the boundary in digital dental cast is feasible.

关 键 词：计算机辅助 STL文件拓扑重建 离散曲率估算 

分 类 号：R783.5[医药卫生—口腔医学]