Study on high-speed contactless 3D measurement for tooth plaster model

Now, in the dentistry domain, the tooth plaster model is genellary used to evaluate of medical treatment on a dentistry reform patient and to educate of a dental technician's skill. It is measured by the optical cutting system. However, it is difficult to use quantitative evaluation of a dental technician's skill because of total measurement time about 2 hours. If this time can be shortened till about 10 minutes, the number of times of total measurement / evaluation can be increased sharply, and improvement in the quality of medical treatment or skill education can be expected. In this paper, the cause of taking measurement time is analyzed and examined first. Next, the measurement system within 10 minutes is proposed using a 3-lines optical cutting and scanning method with measurement accuracy maintained. This system is developed and evaluated by a fundamental experiment.