Occlusal Contact and Clearance in Functional Mandibular Movement.

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  • Okubo Yukiko
    Department of Fixed Prosthodontics, School of Dentistry, The University of Tokushima
  • Bando Eiichi
    Department of Fixed Prosthodontics, School of Dentistry, The University of Tokushima

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  • 機能運動時のこう合接触およびクリアランス

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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.<BR>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.<BR>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.<BR>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.<BR>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.

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