[3Yin-A] Poster 5

[3Yin-A-28] Prototype of a Three-Dimensional Mandibular Motion Measurement System Using a Stereo Camera

〇Kodai Ichikawa¹, Ryo Taguchi¹, Satoru Aoyama², Miyuki Yokoi², Mitsuyoshi Yoshida² (1. Nagoya Institute of Technology, 2. Fujita Health University)

Keywords:

Masticatory movement,Three-Dimensional measurement,Stereo Camera,Mandibular orbit

Quantitative evaluation of masticatory motion is important for preventive medicine and rehabilitation, yet conventional measurement devices are costly and burdensome to install and operate. This study develops a low-cost and convenient three-dimensional mandibular motion measurement system using a stereo camera (Intel RealSense D405). Because overall facial motion can interfere with mandibular tracking, markers are attached not only to the mandible but also to multiple facial regions (e.g., the forehead and nose) to estimate both mandibular position and facial pose. Masticatory motion is then extracted by normalizing facial position and orientation across frames. In an evaluation experiment with one participant, measurement results from an existing system were used as the reference. The proposed method achieved mean errors of 0.5 mm (max 2.9 mm) in the left–right direction, 0.4 mm (max 2.7 mm) in the up–down direction, and 1.1 mm (max 4.2 mm) in the front–back direction.