大臼歯歯冠側面のエナメル質厚さ計測におよぼす近心咬頭面の向きの影響
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概要
- 論文の詳細を見る
Four definitions of enamel thickness measurement of the lateral crown face in the mesial cusp section were compared using sixty molars (ten each for six molar types) of Homo sapiens recovered from the Libben site. In these definitions, a reference line tangent to the lowest point of the enamel-dentine junction (EDJ) of the occlusal basin is drawn parallel to the two dentine cusp tips, the two enamel cusp tips, or the two cervical margins, or perpendicular to the vertical axis of the tooth. Enamel thickness is then measured perpendicular to the EDJ at the two intersecting points of the reference line with the lateral EDJ contour. While measurements based on the four definitions have previously been uncritically compared the present study demonstrates that the four reference orientations differ significantly from each other. These orientational differences result in alternative measures of enamel thickness of the buccal and lingual crown faces. Consequently, the observed pattern of buccolingual gradient in thickness is highly dependent on measurement definition. Although lateral enamel thickness has been highlighted in functional interpretations of enamel distribution patterns, the present results indicate that buccolingual differences of mid-lateral enamel thickness do not exclusively manifest a functionally significant profile, but rather include a large variance component based on artifact of orientation method.
- 国立科学博物館の論文
- 2005-12-22
著者
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諏訪 元
東京大学・総合研究博物館
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諏訪 元
The University Museum The University Of Tokyo
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河野 礼子
Department of Anthropology, National Museum of Nature and Science
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河野 礼子
Department Of Anthropology National Museum Of Nature And Science
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Suwa Gen
The Univ. Museum The Univ. Of Tokyo
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Suwa G
Univ. Tokyo Tokyo
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Suwa Gen
The University Museum The University Of Tokyo
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