| Project/Area Number |
11672037
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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 |
矯正・小児・社会系歯学
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
TETSUYA Ishida Tokyo Medical and Dental University, Graduate School, Associate Professor, 大学院・医歯学総合研究科, 助教授 (80211043)
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| Co-Investigator(Kenkyū-buntansha) |
HISANO Masataka Tokyo Medical and Dental University, Graduate School, Research Associate, 大学院・医歯学総合研究科, 助手 (80282763)
FUJITA Yukihiro Tokyo Medical and Dental University, Graduate School, Assistant Professor, 大学院・医歯学総合研究科, 講師 (50192729)
SOMA Kunimichi Tokyo Medical and Dental University, Graduate School, Professor, 大学院・医歯学総合研究科, 教授 (10014200)
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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 |
¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | mastication / swallowing / computational dynamics / occlusal condition |
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| Research Abstract |
The purpose of this study was to clarify the influence of the occlusal coudition on the flow of bolus from during mastication until swallowing period.
Food in the oral cavity is considered to be destroyed at the first stage, comminuted to particles and mixed with saliva, and becomes a bolus that is suitable for swallowing. Considering this process, the computer simulation was performed concerning the behavior of the bolus under numbers of repetitive cycles of mastication to swallowing as precise as possible. Because the time-dependence course phenomenon required the fluid dynamics, this simulation applied with the finite element nonlinear dynamic analysis. Also, adding the data of the jaw movement of mastication under various occlusal conditions to the simulation. the influence of the occlusal morphology and function on swallowing reflex was physiologically ivestigated.
First, the characteristics of bolus under mastication were measured in subjects who have different occlusal conditions. Measurement of the elasticity of bolus clarified the phenomenon of communition of bolus, and measurement of the viscosity of bolus clarified the phenomenon of mixing bolus with saliva. In addition, a relationship between the elasticity and the viscosity of the bolus at the point of just before swallowing was investigated also.
Second, the flow of bolus between the upper and lower first molars under mastication was simulated and revealed to vary according to the occlusal condition. For Angle Class I case and Angle Class II case, the bolus flowed in the lingual-side direction. However, among these cases, Angle Class II case did not show remarkable flow of bolus in the lingual side direction. On the other side, for Angle Class III, the bolus flowed in the buccal-side direction. These results suggested a closed relationship between the occlusal condition with the flow of bolus and the characteristics of bolus.
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