非接触・高速・高精度3次元形状計測システムによる歯科矯正治療の客観的評価

本研究的目的是开发一种用于正畸诊断模型的定量和三维分析系统。通过本课题的研究，取得了以下成果：1.光学三维测量系统由带有半导体激光器的光学扫描单元、两个CCD摄像机和在局域网上运行CAD软件的加工工作站组成。消除了盲区。该系统在三维表面图像重建的处理速度和可靠性方面均优于其他系统。使用石板和球体对该系统的准确性进行了评估。最大误差约为100微米。从日本牙科大学3500名学生和教职员工中挑选了30名具有理想I类咬合的受试者。计算并评价各FA点的垂直关系。牙弓的FA点不在同一平面上，因此在评估正常牙合的垂直尺寸时，FA点不是可靠的参考点。在日本人正常牙合的调查中，这些受试者的SPEE曲线比以前的测量更平坦。分析结果表明，四次多项式曲线适用于上、下拱的分析。该系统在获得ICP正畸诊断CAD模型方面具有临床可接受的准确性。总之，本研究的结果表明，本研究中所使用的系统具有临床可接受的可靠性，可为正畸领域提供实用的适用性。

The purpose of this study was to develop a quantitative and three-dimensional analyzing system for orthodontic diagnostic casts. From this research project, the following results were obtained.1. The optical three-dimensional measuring system consisted of an optical scanning unit with a semiconductor laser, two CCD cameras, and a processing workstation running CAD software on a local area network. The blind region was eliminated.2. This system was superior to other systems in processing speed and reliability of three-dimensional surface image reconstruction.3. The accuracy of the system was evaluated using a stone plate and spheres. Maximum error was approximately 100 microns.4. Thirty subjects with ideal Class I occlusions were selected from a total population of 3,500 Nippon Dental University students and staff. The vertical relationships of the FA points were computed and evaluated. The FA points in a dental arch do not fall on a common plane, therefore, they are not reliable reference points in assessing vertical dimensions in normal occlusions.5. The curves of Spee of these subjects were flatter than previous measurements in investigations of Japanese normal occlusions.6. The fourth order polynomial curve was found to be suitable for analyzing both upper and lower arches.7. The system exhibited clinically acceptable accuracy for obtaining orthodontic diagnostic CAD models in ICP.In conclusion, the results of this study indicated that the system utilized in this investigation demonstrated clinically acceptable reliability and may provide practical applicability for the field of orthodontics.