【摘要】 为了真实再现下颌的运动过程,设计了一种记录下颌骨六自由度位移的方法;该方法使用两个重叠的网格屏和两束成一定夹角的激光束,用一个CCD视频摄像机采集测量图像,通过简单的计算得到下颌骨的位置与姿态的变化过程;结合上、下牙列的三维扫描数据,可以三维图形的形式再现咬合运动;实验结果表明该文介绍的方法计算公式简单,实时性强,连续测量无误差积累,测量精度可满足口腔医学要求,可用于下颌运动过程的记录。更多还原

【Abstract】 In order to record the movements of mandible and to display occlude movements in 3-D graphics, a six-freedom displacement measurement method is designed. In the method, two collimation laser sources and two superposed screens were adopted. The laser sources are attached on chin and A CDD video camera is used for take pictures. Two laser sources form four light spots on the two screens, and the spots move when chin moves. According to the positions of the light spots on the screens, the positions and the attitudes of chin can be calculated. Combining with the 3 -D scanning data of plaster casts, the occlude movements can be rebuilt in 3-D graphics. The method has the characters of simple, real time, and no errors accumulation. The methods can be used in dentistry for record the movements of mandible.更多还原