Morphological relationship between the mandible and teeth : its functional and evolutionary significance
| Project/Area Number |
22870025
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical anthropology
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| Research Institution | Hokkaido University (2011)
University of the Ryukyus (2010) |
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Principal Investigator |
FUKASE Hitoshi 北海道大学, 大学院・医学研究科, 特任講師 (00582115)
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| Project Period (FY) |
2010 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥3,146,000 (Direct Cost: ¥2,420,000、Indirect Cost: ¥726,000)
Fiscal Year 2011: ¥1,508,000 (Direct Cost: ¥1,160,000、Indirect Cost: ¥348,000)
Fiscal Year 2010: ¥1,638,000 (Direct Cost: ¥1,260,000、Indirect Cost: ¥378,000)
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| Keywords | 下顎骨 / 人類進化 / 形態 / 成長 / 骨格形態 / 個体発生 / 機能形態 |
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| Research Abstract |
To examine when, how, and to what extent the developing dentition within the mandible is interrelated with external mandibular growth, a series of three comparative studies were undertaken. First, an interpopulation comparison was made between prehistoric Jomon and modern Japanese. Second, sex comparisons were conducted in two cercopithecine primates(hamadryas baboon and Japanese monkey). Finally, interspecies comparisons were carried out among four primate species including modern humans. Through the above studies, some suggestions were made : 1) the relatively large size of the anterior teeth is indicated as the common source of the high anterior corpi of the modern Japanese and the male baboons relative to the Jomon and the female baboons, respectively. 2) both interpopulation and interspecies differences in the placement patterns of the incisor and canine crypts within the developing mandible can be accounted for by the size balance between the developing teeth and mandibular available space. 3) species-specific characteristics of the mandibular symphysis, including the inclination, are largely independent of the adult canine size, and its interspecies differences are consistently maintained throughout growth. The results thus indicate the importance of understanding the spatial conditions of the developing teeth in interpreting mandibular morphology.
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Report
(3 results)
Research Products
(14 results)
