Development of a computerized analysis system for tooth-brushing movement

Abstract

We studied differences in the amount and direction of mandibular displacement between healthy adults and volunteers with temporomandibular joint (TMJ) noise. Two silicone occlusal registrations were taken for each of six healthy adults and six volunteers with TMJ noise. The mandibular displacement was estimated by the relationship of the maxillary and mandibular occlusal surfaces. Mandibular displacement in the volunteers with TMJ noise was larger than that in the healthy adults. Displacement of the mandibular dentition was upward, while displacement of the condyle was to the posterior in all of the volunteers with TMJ noise. These results suggest that mandibular displacement from habitual occlusal position to intercuspal position is associated with noise in the joint.