Digitalization and application of dental diagnosis and treatment record

本课题组已研制出一套线激光与CCD摄像机相结合的牙列研究模型数字化系统，该系统可在计算机图形上任意测量牙列解剖特征点的距离，并可对扫描区域进行聚焦，提高了测量精度，为牙列CAD/CAM系统的一部分提供了数据发布。然而，所发布的数据仅可用于牙冠的设计，而不能用于牙槽嵴的下切区域、近端区域等的数字化。因此，我们开发了另一个原型系统，配备了两个线激光器、一个CCD摄像机和工作台的附加轴驱动。我们已经发现这个原型不会丢失任何牙列模型的数据。此外，由于该系统可用于数字化可选的小区域，如嵌体修复模型，在本研究中，我们研制了牙列教学用自动叠加软件，对不同牙列预备模型与主模型和学生预备模型的符合性进行了评价，并利用新研制的数字化软件对牙列研究模型进行了再现，对两种不同数据进行了自动叠加，评估牙科准备实践。其他机构开发的其他系统需要在模型数字化之前使用固定夹具保持坐标轴。而使用该软件，各模型的三维形状被自动识别并叠加，不受坐标轴的影响。因此，本软件能够减少模型数字化时的限制。

We already developed the digitizing system for the dentition study model using a line laser and CCD camera, which was available for measuring the distance of anatomical characteristic points on the computer graphics optionally and could focus the scanning area to progress the measuring accuracy and release data for a part of the dental CAD/CAM system. However, the released data was only available for the design of crowns, and not available for digitizing the under cut area of alveolar ridge, proximal area, and etc. Therefore, we have developed another prototype system, equipping two line lasers, one CCD camera, and additional axis drive of working stage. We already found this prototype could not lose any data for a dentition model. Moreover, since this system was available for digitizing the optionally small area like an inlay restoration model, in this study, we developed automatically superimposing software for dental education and evaluated the conformity of different preparation models between the master model and the student prepared model.Newly developed digitizing software was available to reproduce the dentition study models and automatically superimpose the two kinds of different data to evaluate the dental preparation practice. Other systems developed by other institutions were necessary to keep the axis of coordinates using a fixing jig before digitizing the model. However, using this software, three-dimensional form of each model was recognized and superimposed automatically without influenced by the axis of coordinates. Therefore, the present software was able to reduce the restrictions at the time of model digitizing.