Development of 3-D Motion Display System to Assist Diagnostic Treatment of Occlusal Disorder (Contact State Analysis of Upper and Lower Teeth with Patient-Specific Hybrid Model)

Abstract

Contact state of upper and lower teeth is very important for diagnostic treatment of occlusal disorders. This paper discusses a 3-D motion display system with a patient-specific hybrid model to analyze detailed contact state of upper and lower teeth. The hybrid model consists of maxillary and mandibular bone data with cone beam X-ray CT and precise teeth shape data with industrial X-ray CT. In terms of 3-D motion measurement, appropriate camera angles and frame rates are also discussed to improve the accuracy of the display system. With these improvements, this study achieves 0.1 mm accuracy which enables to evaluate the contact state of teeth. Several masticatory movements are analyzed with the new system and the analytical results provide detailed information of contact state during mastication of foods.