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Smoothness of masticatory jaw movements before and after orthodontic treatment

Research Project

Project/Area Number 12671995
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 矯正・小児・社会系歯学
Research InstitutionOsaka University

Principal Investigator

YASHIRO Kohtaro (2001)  Graduate school of dentistry, Osaka University, Research assistant, 大学院・歯学研究科, 助手 (10303976)

山内 多恵 (2000)  大阪大学, 歯学部・附属病院, 助手 (30314389)

Co-Investigator(Kenkyū-buntansha) TAKADA Kenji  Graduate school of dentistry, Osaka University, Professor, 大学院・歯学研究科, 教授 (50127247)
社 浩太郎  大阪大学, 大学院・歯学研究科, 助手 (10303976)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsMasticatory movement / Malocclusion / Smoothness / Motor control / Mathematical modeling / Orthodontic treatment / Occlusal interference / Children / 顎運動機能 / 運動の円滑性 / 運動生理学 / 歯科矯正治療
Research Abstract

First, we investigated whether the minimum-jerk model predict the 3D jaw movement trajectories during chewing. The two types of test foods were used : gum and gummy jelly. The jaw movements were recorded from children and adults groups with good occlusions. For adults and children groups, the model precisely explained the jaw movement kinematics. Hence, it is suggested that the subjects with normal occlusions may control the jaw movement so as to maximize their smoothness during chewing. However, the jerk-costs of the jaw closing motion for the children were significantly higher than those determined for the adults. In addition, the jerk-cost variation was greater in children than adults. The greater variances of jerk-cost for the children may be the results of variety of the motor adaptation process to the dental developmental changes during childhood with mixed-dentition.
Second, the jaw motor adaptation process to the experimentally produced acute occlusal interference was investigated. The unilateral chewing jaw motion with occlusal interference set at the molar site on the contra- lateral side was recorded for adults' volunteers. The jerk-cost showed significant decrease in association with the progress of the motor adaptation. Accordingly, it is confirmed that the jerk-cost may be the useful parameter of evaluating quantitatively the changes in jaw kinematic characteristics during chewing efforts.
Finally, the masticatory jaw movements were recorded from the patients with severe skeletal 3 antero-posterior jaw deviations. The results showed significantly higher jerk-costed jaw movements in patients with deviated jaw relationships. Thus, it is suggested that the masticatory jaw motion in subjects with good occlusion may optimize the jaw motion to be more economical than that for the patients with sever malocclusion.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Yashiro, K., Fujii, M., Yamauchi, T., Takada, K: "Effects of Food Consistency on Smoothness of Mandibular Movement in Human Mastication"Dentistry in Japan. 37. 78-80 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yashiro, K., Fujii, M., Hidaka, O., Takada, K: "Kinematic modeling of jaw closing movement during food-breakage"Journal of Dental Research. 80. 2030-2034 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yashiro, K., Fujii, M., Yamauchi, T., and Takada, K.: "Effects of Food Consistency on Smoothness of Mandibular Movement in Human Mastication"Dentistry in Japan. 37. 78-80 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yashiro, K., Fujii, M., Hidaka, O., and Takada, K.: "Kinematic modeling of jaw closing movement during food-breakage"Journal of Dental Research. 80. 2030-2034 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yashiro, K., Fujii, M., Yamauchi, T., Takada, K: "Effects of Food Consistency on Smoothness of Mandibular Movement in Human Mastication"Dentistry in Japan. 32. 78-80 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yashiro, K., Fujii, M., Hidaka, O., Takada, K: "Kinematic modeling of jaw closing movement during food-breakage"Journal of Dental Research. 80. 2030-2034 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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