2009 Fiscal Year Final Research Report
Comprehensive Study of the Causes of Mandibular Tori
| Project/Area Number |
18570223
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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 |
Anthropology
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| Research Institution | Nihon University |
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Principal Investigator |
IGARASHI Yuriko Nihon University, 松戸歯学部, 講師 (60277473)
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| Co-Investigator(Kenkyū-buntansha) |
KANAZAWA Eisaku 日本大学, 松戸歯学部, 教授 (70050648)
SUZUKI Kunihiro 日本大学, 松戸歯学部, 准教授 (30256903)
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| Co-Investigator(Renkei-kenkyūsha) |
KONDO Shintaro 愛知学院大学, 歯学部, 准教授 (60186848)
YAMASHITA Masaki 獨協医科大学, 医学部, 助教 (80255009)
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| Project Period (FY) |
2006 – 2009
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| Keywords | 下顎隆起 / 現代人 / 古人骨 / 遺伝因子 / 環境因子 / CT / 組織学 / 生体力学 |
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| Research Abstract |
88% of Jomon people and 83% of the present-day Japanese had palpable mandibular tori. In Yayoi, Kofun, Kamakura, Muromachi, Edo and modern groups, less than 70% people had palpable tori. 21% of the preset-day Japanese had developed tori, and in other groups, less than 10% had developed tori. Mandibular tori had proved to be influenced by genetic factor. Occlusal stress, lasting occlusal stress for long years could be environmental factor to develop tori, even though these factors are less than 30% of all factors.
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