| Project/Area Number |
11671959
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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 | The Nippon Dental University |
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Principal Investigator |
ARAKAWA Ichiro The Nippon Dental University, Faculty of Dentistry, Department of Partial and Complete Denture, Research Assistant, 歯学部, 助手 (00277592)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Yoshinori The Nippon Dental University, Faculty of Dentistry, Department of Partial and Complete Denture, Professor, 歯学部, 教授 (20095102)
SHIGE Hiroshi The Nippon Dental University, Faculty of Dentistry, Department of Partial and Complete Denture, Associate Professor, 歯学部, 助教授 (50226114)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Masticatory Movement / Brain Blood Flow / Surface Blood Flow / Masseter Muscular Activity / Near-Infrared Spectroscopy |
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| Research Abstract |
The purpose of this experiment was to clarify the relationship between masticatory movement and brain blood flow.
Forty healthy subjects (20 males and 20 females) in their twenties were asked to chew a piece of chewing gum on their habitual chewing side. The masseter muscular activity using EMG, the surface blood flow using laser bloody flow meter, and the deep blood flow of the forehead and temporal region using NIRS (Near-infrared spectroscopy) were recorded simultaneously. The change of the deep blood flow of the forehead and the temporal region during mastication were investigated and then compared between the amount of blood flow in the brain and the integral values of masseter muscular activities.
Though the surface blood flow of the forehead did not change during mastication, the deep blood flow of the forehead increased during mastication and returned to its original state. It was confirmed that the device used in this experiment could detect the brain blood flow without the influence of muscular activity, and the probe of the anterior temporal region also could detect the brain blood flow.
The brain blood flow increased during mastication and decreased when mastication ceased and returned to its original state. And the integral values of masseter muscular activity and the blood flow in the brain were smallest at weak period and increased in order of medium period and strong period. A significant difference was found between the periods. From, these results it was concluded that the blood flow in the brain did increase by masticatory movement and the strength of the muscular activity affected the changes of brain blood flow.
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