| Project/Area Number |
02807189
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | Higashi Nippon Gakuen University |
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Principal Investigator |
WATANABE Sigeru Higashi Nippon Gakuen University, School of Dentistry, Pediatric Dentistry, Associate Professor, 歯学部・小児歯科学講座, 助教授 (60113049)
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| Co-Investigator(Kenkyū-buntansha) |
IGARASHI Seiji Higashi Nippon Gakuen University, School of Dentistry, Pediatric Dentistry, Prof, 歯学部・小児歯科学講座, 教授 (20001943)
KAWANO Eiji Higashi Nippon Gakuen University, School of Dentistry, Pediatric Dentistry, Rese, 歯学部・小児歯科学講座, 助手 (90195115)
IMAI Kaori Higashi Nippon Gakuen University, School of Dentistry, Pediatric Dentistry, Rese, 歯学部・小児歯科学講座, 助手 (10213208)
OONISHI Mineko Higashi Nippon Gakuen University, School of Dentistry, Pediatric Dentistry, Rese, 歯学部・小児歯科学講座, 助手 (80184795)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Mastication / Chewing time / Salivary flow rate / The water content of food / The water content of food bolus / Children / 食物 / 食塊 / 水分量 / 一口量 |
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| Research Abstract |
To develop the study of mechanism for food mastication in children who have decidious dentition, we approached from the aspects of chewing and tasting of food, secreted saliva, and swallowing of food bolus.
We applied the chewing-spit technique described by Edger et al. to children for the first time, and established a method for the studying on the food mastication In children. We also established the formula to calculate the percentage of food either inadvertently swallowed or retained in the mouth and not expectorated.
In the main study, the normal weight of food per mouthful, the normal chewing time for one mouthful and the water content of the food bolus in each subjects showed surprisingly regular values when used the same foods and amounts. The mean - chewing time per I g of each food was inversely related to the initial water content of the food. The percent water content of the food bolus showed significant correlation to the initial water content of each food and also showed that it needed at least 50 % of the water content to swallow. Although the salivary flow rates in response to given foods and amounts in each subjects. Our study also revealed that the effect of the gustatory stimulation of foods was much more important than the mechanical stimulation from chewing in producing the flow of saliva.
In conclusion, our study revealed that the water content of the food bolus, in case of soft foods, could be one of the important factors in the decision to swallow, and the salivary flow secreted by some food textures such as taste and the percent water content of food were of great importance to the food mastication In children.
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