Electronic surveying of digital partially dentate casts
10.3760/cma.j.issn.1002-0098.2009.12.016
- VernacularTitle:牙列缺损数字化模型观测方法初探
- Author:
Jing HAN
1
;
Yong WANG
;
Pei-Jun LÜ
;
Xiao-Fei TANG
;
Ya-Ping WANG
Author Information
1. 北京大学口腔医学院口腔医院
- Keywords:
Computer-aided design;
Denture;
partial;
removable;
Survey;
Path of insertion
- From:
Chinese Journal of Stomatology
2009;44(12):763-766
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop a method of surveying the digitalized partially dentate cast in order to accomplish computer aided design (CAD) of removable partial denture (RPD) frameworks.Methods The stone cast of a partially dentate patient was scanned using a three-dimensional laser scanner.Points on the surface of the digitalized cast,termed as a "point cloud",were obtained.The point cloud was then imported into self-developed Tanglong software to sample and uniform.New module of identifying the surveying lines was specially written in Tanglong using C++.A straight line was created in the center of the cloud point.Then the cloud point surrounding the straight line was divided into many parts.Localcoordinates were established to indicate the information of angle and distance of every point to the straight line.Surveying lines were produced step by step electronically by identifying the closest and farthest points relative to the straight line and then connected together.Different surveying lines were obtained by adjusting the angle of the straight line.After the surveying lines were decided,the undercut areas could be marked and the depth of undercut was calculated automatically.The blockout of the undercuts could also be achieved by moving the location of the point cloud in undercut area.Results Survey lines of digitalized partially dentate casts were generated in computer.The undercut area and its depth were identified and the undercut could be blocked out.The shape of survey lines on the digitalized casts was similar to that on the physical casts drawn using traditional method.Conclusions The new module in Tanglong software was developed specifically for surveying partially dentate casts.It had a user-friendly interface with the easy-tounderstand menus.The success of surveying dental casts digitally would make it possible to CAD of RPD frameworks.
