以三维B样条曲线网格构建嵌体轴面  

Construction of inlay axial surface using B-Spline curve network

作　　者：刘明丽[1] 王勇[1] 吕培军[1] 

机构地区：[1]北京大学口腔医学院.口腔医院计算机应用中心

出　　处：《北京大学学报（医学版）》2006年第4期438-440,共3页Journal of Peking University:Health Sciences

基　　金：北京市科技项目(H010910200112)资助~~

摘　　要：目的:解决光顺品质与精度在曲面构建中相冲突的问题,实现在嵌体计算机辅助设计中兼顾生理性外形、光顺品质及邻接区精度的三维轴面构建。方法:以特定分布的三维B样条曲线网格定义嵌体轴面。提出以轴角区等特征区域牙合龈向的约束线为中间过程曲线,指引轴面生理性突度的构建,以邻接区相互垂直的两条构建线实现邻接区精确三维形态的构建。用较少的构建线来定义B样条曲面,以简化操作过程,并有利于曲面较高光顺品质的实现。结果:所设计的嵌体轴面表面光顺,外形突度与剩余牙体组织一致,邻接触区三维形态准确。结论:以特定分布的三维B样条曲线网格定义三维曲面,可以实现嵌体轴面良好的精度、光顺的品质及与邻近组织结构的连续性。Objective： To realize the requirement of adjacent area accuracy, axial surface physical contour and smoothness in the process of inlay computer-aided design （CAD）. Methods ：A compromised method was brought forward that some assistant 3-D constraint lines from occlusion to gingiva were used to lead the inlay contour on axial corner and other characterized areas, and two perpendicular 3-D constructing lines at adjacent area were used to construct accurate 3-D configuration of this area. The axial surface was completely defined by the network of specified curves which were two constructing lines and four borders. Results. Inlay axial surface was smooth, the contour was consistent with the residual tooth body and the 3-D configuration in adjacent area was accurate. Conclusion：It is feasible to realize the inlay axial surface accuracy, smoothness, and consistency using the method of special distributed 3-D B-Spline curve network.

关 键 词：计算机辅助设计 成像 三维 嵌入法 

分 类 号：R783.3[医药卫生—口腔医学]