Associations between carabelli trait and cusp areas in human permanent maxillary first molars
Associations between carabelli trait and cusp areas in human permanent maxillary first molars
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DOI：
10.1002/ajpa.20271
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发表时间：
2006-02-01
影响因子：
2.8
通讯作者：
Townsend, GC
中科院分区：
文献类型：
--
作者：
Kondo, S;Townsend, GC
很少有牙科人类学研究使用定量方法调查人类牙冠尺寸和牙冠特征之间的关联。我们测试了几个假设的整体冠的大小，个人尖面积，并在人类永久性第一磨牙的Carabelli尖的表达，通过获得数据的标准化咬合照片的308名澳大利亚人的欧洲血统（171名男性和137名女性）。具体来说，我们的目的是计算四个主要的磨牙尖，也Carabelli尖，并比较相对变异的尖面积的发展时间。我们还旨在比较男性和女性之间的牙尖面积，并描述Carabelli尖与其他磨牙尖的相互作用。测量包括最大牙冠直径（近远中和颊舌牙冠直径），四个主要尖瓣的面积和Carabelli尖瓣的面积。磨牙牙尖的绝对面积的相对变化的模式对应于其形成的顺序，第一次形成paracone显示最小的变化，和最后形成Carabelli尖显示最大。整体冠大小和个别尖的面积都表现出两性异形，男性的价值超过女性。性二态性在旁锥区最小，在Carabelli尖区最大。整体冠的大小和尖面积较大的个人显示Carabelli尖，特别是次锥区。虽然合并面积的原锥和Carabelli尖瓣是更大的尖瓣形式比noncuspal形式，原锥面积单独显着较小的前者。我们的研究结果使我们提出，在个体的基因型为Carabelli性状表达，较大的臼齿冠更有可能显示Carabelli尖，而臼齿较小的冠更有可能显示减少形式的性状的表达。我们认为，折叠的内部釉质上皮细胞在发展中的磨牙冠，特别是在protocone区域的模式，可以修改一个发展中的Carabelli尖。(c)2005 Wiley-Liss，Inc.
Few dental anthropological studies have investigated the associations between tooth crown size and crown traits in humans using quantitative methods. We tested several hypotheses about overall crown size, individual cusp areas, and expression of Carabelli cusps in human permanent first molars by obtaining data from standardized occlusal photographs of 308 Australians of European descent (171 males and 137 females). Specifically, we aimed to calculate the areas of the four main molar cusps, and also Carabelli cusp, and to compare the relative variability of cusp areas in relation to timing of development. We also aimed to compare cusp areas between males and females and to describe how Carabelli cusp interacted with other molar cusps. Measurements included maximum crown diameters (mesiodistal and buccolingual crown diameters), the areas of the four main cusps, and the area of Carabelli cusp. The pattern of relative variability in absolute areas of molar cusps corresponded with their order of formation, the first-forming paracone displaying the least variation, and the last-forming Carabelli cusp showing the greatest. Overall crown size and areas of individual cusps all showed sexual dimorphism, with values in males exceeding those in females. Sexual dimorphism was smallest for paracone area and greatest for Carabelli cusp area. Overall crown size and cusp areas were larger in individuals displaying a Carabelli cusp, especially the hypocone area. Although the combined area of the protocone and a Carabelli cusp was greater in cuspal forms than noncuspal forms, protocone area alone was significantly smaller in the former. Our findings lead us to propose that, in individuals with the genotype for Carabelli trait expression, larger molar crowns are more likely to display Carabelli cusps, whereas molars with smaller crowns are more likely to display reduced forms of expression of the trait. We suggest that the pattern of folding of the internal enamel epithelium in developing molar crowns, particularly in the protocone region, can be modified by a developing Carabelli cusp. (c) 2005 Wiley-Liss, Inc.