Abstract
We previously reported the three-dimensional analyzing system of occlusal tooth contacts. Using this system, we studied the functional tooth contacts and clearance of five subjects particularly during masticatory movements.
1. Tooth contacts and interocclusal clearance less than 1 mm can be analyzed during functional mandibular movements by using the six-degree-freedom jaw movement data and the three-dimensional morphology measurement of tooth surfaces.
2. Dominant tooth contacts were observed on the non-chewing side than on the chewing side during masticatory movements. The tooth contact sites on the non-chewing side corresponded to the region of contacts or tiny clearance which occurs during mediotrusive movement.
3. Tooth contacts and clearance at the beginning and the end of chewing cycle (jaw opening and jaw closing) were compared with those during lateral- excursive movement. Tooth contacts and clearance during masticatory movement toward opening more corresponded to those during lateral excursive movement.
In summary, the non-chewing side tooth contacts may play an important role in the support and guidance of mandible throughout the functional masticatory movements. That means there is a need for more precise evaluation regarding non-working side occlusal tooth contacts in functional movements.
