| Project/Area Number |
01571128
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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 | Showa University |
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Principal Investigator |
HIRAIDE Takatoshi Showa Univ., Dent., Assist. Prof., 歯学部, 助教授 (80129866)
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| Co-Investigator(Kenkyū-buntansha) |
AIGASE Setsuko Showa Univ., Dent., Assistant, 歯学部, 助手 (40175683)
SHIBATA Yasunori Showa Univ., Dent., Lecturer, 歯学部, 講師 (50138400)
SHIBASAKI Yoshinobu Showa Univ., Dent., Professor, 歯学部, 教授 (40014005)
FUKUHARA Tatsuo Showa Univ., Dent., Professor, 歯学部, 教授 (50013834)
清水畑 明 昭和大学, 歯学部, 助手 (50187473)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | soft foods / masticatory muscle / muscle-fiber type / ATPase staining method / mandible |
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| Research Abstract |
The purpose of this study was to elucidate the influence of histochemical characteristic of masticatory muscle-fibers on craniofacial growth in rats.
One group fed a normal hardness food as a control (group A), while another three groups (group B-D) fed a soft diet in order to induce a low functional activity. Group B was less loaded than group A, group C was powder, and group D was our own making.
The experimental period was 29 weeks and started from 3-week-old rats.
(Results) 1. Body weight was decreased in group C till the end of 4th weeks of the experimental period. 2. Decrease in linear measurement of mandibular length was found only in group C and decreasing linear measurement of mandibular height was found in group C and group D.
Comparing group A with group D by ATPase staining method gave attention of the histochemical characteristic of muscle-fibers in masseter and temporalis muscles. It showed changes of fibers area composition and decrease of fiber diameter.
The most important finding was the correlation between the most affected period of mandibular vertical growth and most affected period of changes of masseter and temporalis muscles.
Changing in the histochemical characteristic of muscle-fibers loading on the mandible was suggested to suppress mandibular vertical growth.
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