3-DAuto Tracking Systemの開発

Movements of soft tissues surrounding the oral cavity, especially lips and cheeks, have a great influence on the masticatory and the phonetic functions. These movements can indicate the state of harmony between a denture and the soft tissues surrounding it.The purpose of this study was to develop a real-time measuring system for three-dimensional movements of soft tissues. This system consists of two Video Trackers, which are placed stereographically and provide two-dimensional data of the movement. Three-dimensional coordinates of movements in points can immediately be calculated by a computer. We examined the accuracy of this system using the computerized XYZ pulse stage.The result was as follows:The resolution of the measuring system was 0.10×0.10×0.10 mm. The measurement was carried out in the area of 24.0 (x)×20.0 (y)×20.0 (z) mm with the working distance of 500 mm and with the frequency of 120 Hz.