关键词: 牙合面, 边界环偏置, 区域提取

Abstract: In order to manufacture molar restorations accurately so that which can occlude well，it is necessary to partition molar restorations into some characteristic regions such as gouge，socket and ridge.This paper firstly expatiates how to fix the edge of characteristic regions by an interactive way with computer.Secondly an offsetting for edge rings is proposed and some problems such as “region connected by point”，“sharp-angled ring” and “self- intersect” are solved.Then the STL data of characteristic regions are extracted.Finally some extracting examples on the STL model of a molar restoration are provided.

Key words: occlusal region, offsetting, region extraction