Tissue contributions to sex and race: Differences in tooth crown size of deciduous molars
Tissue contributions to sex and race: Differences in tooth crown size of deciduous molars
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DOI：
10.1002/ajpa.1077
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发表时间：
2001-07-01
影响因子：
2.8
通讯作者：
Barcroft, BD
中科院分区：
文献类型：
--
作者：
Harris, EF;Hicks, JD;Barcroft, BD
这项研究描述了组成乳牙牙冠的成分(釉质、牙本质和牙髓)的大小，以解决男性具有比女性更大的牙齿的特点，以及美国黑人的牙齿比美国白人的牙齿大的观察结果。使用计算机辅助图像分析从咬合X线片中收集测量数据(n=333人)。测量牙冠近侧和远侧轮廓高度的组织厚度(牙釉质、牙本质、牙髓)。乳牙近远中磨牙冠长约由1/7牙釉质、1/3牙本质和1/2牙髓组成。细节因牙齿类型不同而不同，但男性的牙本质和牙髓尺寸通常比女性大得多；边缘牙釉质厚度没有性别差异。在这里测试的所有变量中，男性与女性的比例都是等距的。黑人在所有组织中的大小都远远超过白人，但组织类型与黑人和白人的比例相同，但有一个例外：黑人的釉质厚度不成比例地厚。虽然绝对差异很小(黑人四种乳磨牙类型的牙釉质总和为5.56毫米，而白人为5.04毫米)，但统计学上的差异是相当大的(P<；0.001)。除牙釉质外，黑人的牙冠尺寸与白人相比按比例增加。主成分分析证实了这些单变量关系，强调了牙冠成分厚度的统计独立性，这与构成牙冠的组织的顺序生长和不同的胚胎起源是一致的。结果直接关注牙釉质和牙本质沉积的比率(对此知之甚少)，因为文献表明黑人(牙冠更大，釉质更厚)比白人花更少的时间在牙齿形成上。(C)2001年Wiley-Liss，Inc.
This study describes size of constituent deciduous tooth crown components (enamel, dentine, and pulp) to address the manner in which males characteristically have larger teeth than females, and the observation that teeth of American blacks are larger than those of American whites. Measurements were collected (n = 333 individuals) from bitewing radiographs using computer-aided image analysis. Tissue thicknesses (enamel, dentine, pulp) were measured at the crown's mesial and distal heights of contour. Deciduous mesiodistal molar crown length is composed of about 1/7 enamel, 1/3 dentine, and 1/2 pulp. Details differ by tooth type, but males typically have significantly larger dentine and pulp dimensions than females; there is no sexual dimorphism in marginal enamel thickness. Males scale isometrically with females for all variables tested here. Blacks significantly exceed whites in size of all tissues, but tissue types scale isometrically with blacks and whites with one exception: enamel thickness is disproportionately thick in blacks. While the absolute difference is small (5.56 mm of enamel in blacks summed over all four deciduous molar tooth types vs. 5.04 mm in whites), the statistical difference is considerable (P < 0.001). Aside from enamel, crown size in blacks is increased proportionately vis-a-vis whites. Principal components analysis confirmed these univariate relationships and emphasizes the statistical independence of crown component thicknesses, which is in keeping with the sequential growth and separate embryonic origins of the tissues contributing to a tooth crown. Results direct attention to the rates of enamel and dentine deposition (of which little is known), since the literature suggests that blacks (with larger crowns and thicker enamel) spend less time in tooth formation than whites. (C) 2001 Wiley-Liss, Inc.