| Project/Area Number |
03454487
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
小児・社会系歯学
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| Research Institution | Nippon Dental University |
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Principal Investigator |
ISHIKAWA Haruo Nippon Dental Univ.Chairman Dept.of Orthod.Professor, 歯学部, 教授 (40120604)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Toshihiro Nippon Dental Univ.Instructor Dept.of Orthod, 歯学部, 助手 (60172417)
KOBAYASHI Keisuke Nippon Dental Univ.Instructor Dept.of Orthod, 歯学部, 助手 (10153602)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1993: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Malocclusion / Masticatory Movement / Chewing Movement / Chewing Path / Chewing Rhythm / Automatic Analyzing System / 開咬 / 自動分析 / 安定性 |
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| Research Abstract |
(1)PURPOSE
The purpose of this study was to answer the question of whether certain morphological findings of malocclusions were associated with specific modes of chewing movements. The work was designed to assess the stability of chewing path and rhythm in normal and malocclusion subjects.
(2)METHOD
The chewing movements of malocclusions while chewing gum were recorded with a MKG and an NEC computer and were processed by an automatic masticatory movement analyzing software system. The following parameters in terms of the stability of chewing movements were considered : standard deviation (SD) values in lateral and vertical distances of opening and closing movements, coefficient of variation (CV) values in opening, closing, occluding and total cycle times.
(3)RESULT
The data obtained from the malocclusion subjects as compared with those from a group of 67 normal healthy individuals showed statistically significant increments of SD values in lateral distance of the opening and in vertical distance as well as statistically significant increments of CV values in opening, closing, occluding and total cycle times. It is concluded that the stability of chewing movements in malocclusions is not very stable.
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