Fluctuation of the Mandible during Intercuspation.

DOI Web Site 7 Citations 28 References
  • Kuremoto Koh-ichi
    Department of Removable Prosthodontics and Occlusion, Osaka Dental University
  • Maeda Teruta
    Department of Removable Prosthodontics and Occlusion, Osaka Dental University
  • Shimamura Seiji
    Department of Removable Prosthodontics and Occlusion, Osaka Dental University
  • Inoue Hiroshi
    Department of Removable Prosthodontics and Occlusion, Osaka Dental University

Bibliographic Information

Other Title
  • こう頭かん合時における下顎の動揺

Search this article

Description

Purpose: Intercuspal position (ICP) is a static tooth contact position, but in vivo, there is a relationship between the degree of bite force and the degree of intercuspation and associated tooth movement within the periodontal space. The purpose of this study was to examine how the mandible fluctuates during intercuspation.<BR>Methods: To observe minute mandibular fluctuations, we developed a new sensor system using a silicon optoelectric position sensitive detector (PSD) and an infrared LED. A clutch-mounted PSD was attached to the buccal and labial aspects of the maxillary teeth, and an LED was attached to the mandibular teeth with the clutch. The mandibular position was measured in 11 subjects with natural dentition. We performed the experiments under two conditions: on-the-model and in-vivo conditions. Both PSD and LED were fixed with a plaster model of each subject on the articulator, to evaluate the precision of this sensor system (on-the-model condition). All subjects occluded their teeth without clenching in ICP for more than 30 seconds (in-vivo condition). The experiments were repeated three times, and we measured antero-posterior and lateral ranges and variances of mandibular fluctuations in ICP for 30 seconds. The distance of mandibular positions at the beginning of, and at the end of, occluding for 30 seconds, was also measured.<BR>Results: There were significant differences in ranges, variances, and distances of ICP between the two conditions. The range of ICP on-the-model condition was about 6 μm, whereas the range of ICP in-vivo condition was about 40 μm. The variance and distance of the ICP in-vivo condition were significantly larger than those of the on-the-model condition.<BR>Conclusions: It is apparent that the mandible fluctuates within antero-posterior and lateral ranges of about 40 μm during intercuspation. We speculate that the fluctuation represented the physiological motion to maintain ICP.

Journal

Citations (7)*help

See more

References(28)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top