非接触式牙颌模型三维激光测量分析系统的研制

A study of dental cast by using 3D-laser non-contact measurement and analysis

目的 研制开发非接触式牙颌模型激光扫描三维数字化系统。方法 用两个步进电机构成牙颌模型旋转与平移的合成运动 ,由一个半导体激光器和两个线阵列 (chargecoupleddevice ,CCD)摄像机获得模型表面各点的三维座标。采用VisualC ++编程 ,在Windows环境下运行 ,完成扫描控制、三维图形重建及测量。结果 该系统测量范围为 70mm× 70mm× 70mm ,测量精度为 0 .0 1mm ,平均测量误差 <0 .1mm ,单颌模型扫描时间 <2 5分钟。用本系统与手工方法对 15副正常颌模型进行测量比较 ,二者间差异无显著性 (P >0 .0 5 )。结论 该系统具有精确、简单、高效、测量内容丰富、完整、直观等优点。还开发出一些以往靠手工方法无法实现的新功能。

Objective To research and develop a new scanning 3 D digitization system for noncontact measuring of dental cast.Methods By using two pulsate motor to make the synthetic movement of the dental cast, a special semiconductor laser and two special line array CCD, the 3D coordinate could be gotten from the surface of the dental cast in any where. The program which is developed by Visual C++ language and run under the Windows surroundings can control the scanner, rebuild the 3D graphics and measure the coordinate of the dental cast.Results The system offers 70 mm×70 mm×70 mm measurement scope, 0.01 mm resoling power <0.1 mm mean deviation, 25mins for single cast scanning. Conclusion This system provides many advantages such as in precision, simplicity, high efficiency, and wide range of measurement contents with complete direct view. It also supplied us some new functions which can not be done with traditional way of measurement.