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

本研究旨在建立一个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.光学三维测量系统包括一个光学扫描单元与半导体激光器，两个CCD相机，和一个处理工作站运行CAD软件在局域网上。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上均优于其他系统，具有上级的特点.使用石板和球体评价系统的准确性。最大误差约为100微米。从日本齿科大学的3,500名学生和工作人员中选择了30名具有理想I类咬合的受试者。计算和评价FA点的垂直关系。牙弓中的FA点不落在一个共同的平面上，因此，它们不是评估正常咬合垂直尺寸的可靠参考点。这些受试者的Spee曲线比以前在日本正常咬合调查中测量的更平坦。四阶多项式曲线被发现是适合于分析上下拱.该系统表现出临床上可以接受的准确性获得正畸诊断CAD模型ICP。总之，本研究的结果表明，在这项调查中使用的系统表现出临床上可以接受的可靠性，并可能提供实际应用领域的正畸学。

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.