| Project/Area Number |
11671963
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | AICHI-GAKUIN UNIVERSITY |
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Principal Investigator |
SAKUMA Shigemitsu Aichi-gekuin Univ., School of Dentistry, Assistant Professor, 歯学部, 講師 (80271386)
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| Co-Investigator(Kenkyū-buntansha) |
ARIJI Yoshiko Aichi-gekuin Univ., School of Dentistry, Assistant Professor, 歯学部, 講師 (60232063)
NYRAJANU Hiroshi Aichi-gekuin Univ., School of Dentistry, Assistant Professor, 歯学部, 講師 (50182100)
ARIJI Eiichirou Aichi-gekuin Univ., School of Dentistry, Professor, 歯学部, 教授 (00150459)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | bite force / masseter muscle / cros-sectional area / muscle activity / 筋横断面積 / 筋活動量 |
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| Research Abstract |
In this study, examination was done on the correlation among bite force, thickness, cross-sectional area of masseter muscles and the quantity of muscle activities (EMG), which were recorded at the same time.
【Method】 Examination objects : 15 normal dentate males and 15 normal dentate females (age : 24 ±2.6Y.). The measurement of bite force, thickness, cross-sectional area of masseter muscles and EMG were done during maximum clenching and physiological rest position. 【Analysis】 The intensity of related nature of the correlation of bite force, thickness, cross-sectional area of masseter muscles and EMG.The variable explanation of bite forces was examined by multiple regression analysis respectively.
【Result】 1. The correlation coefficient of bite force and thickness, cross-sectional area of masseter muscles in physiological rest position were 0.62 (p value : 0.0002) and 0.54 (p value : 0.0016). And the correlation coefficients in maximum clenching were 0.54 (p value : 0.0019) and 0.52 (p value : 0.0027). 2. The correlation coefficient of bite force and EMG was 0.11 (p value : 0.59). 3. Variable explanation of masseter muscles according to the analysis of variable explanation of bite force in maximum clenching showed the regression coefficients were -0.03 and 0.53. And in rest position showed the regression coefficients were -0.05 and 0.52.
【Conclusion】 From the examination of the correlation among bite force, thickness, Crosssectional area of masseter muscles and EMG showed that correlation between bite forces in rest position was stronger compared to the clenching condition. However, in evaluation of function of masseter muscles, it is simpler to consider the situation where the bite force and thickness in rest position.
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