Do Mid-Crown Enamel Formation Front Angles Reflect Factors Linked to the Pace of Primate Growth and Development?
Do Mid-Crown Enamel Formation Front Angles Reflect Factors Linked to the Pace of Primate Growth and Development?
复制标题
DOI：
10.1002/ar.23703
复制
发表时间：
2018-01-01
影响因子：
2
通讯作者：
Ferrell, Rebecca J.
中科院分区：
文献类型：
--
作者：
Guatelli-Steinberg, Debbie;Pampush, James D.;Ferrell, Rebecca J.
牙釉质形成前沿（EFF）角度代表了特定时间点牙釉质基质分泌的前沿。这些角度受到牙釉质延伸速率（牙冠生长高度的速率）、牙釉质基质分泌速率和棱柱与牙釉质交界处形成的角度的影响。先前的研究表明，但尚未确定，这些角度反映了灵长类动物生物学的各个方面，与它们的生长和发育速度有关，最明显的是大脑和身体的大小。本研究使用系统发育控制和bonferroni校正分析跨越广泛的分类范围，在组织学切片上测试了这种可能性。在前牙的分析中有10种；17在分析后（后犬齿）牙齿（不同样本量）。此外，我们还测试了EFF角度与Retzius周期性条纹（牙釉质长周期生长节律）和folivory程度的关系，因为这两个因素都与灵长类动物的发育速率有关。最后，进行了一些分析，以调查牙齿尺寸（操作为EDJ长度）是否可能介导这些关系。中心结果如下：(1)EFF角与脑重（前牙）、EFF角与体重（前牙和后牙）的关系有统计学意义；(2)中冠EFF角与EDJ长度的关系无统计学意义。这些结果表明，牙齿大小并不能介导EFF角度与脑重量/体重之间的关系，并就潜在的牙釉质生长变量（特别是牙釉质延伸和分泌的速度）进行了讨论。Anat Rec, 2017。(c) 2017 Wiley期刊公司科学通报，2018,31(1):1 - 3。(c) 2017 Wiley期刊公司
Enamel formation front (EFF) angles represent the leading edge of enamel matrix secretion at particular points in time. These angles are influenced by rates of enamel extension (the rates at which tooth crowns grow in height), rates of enamel matrix secretion and the angles that prisms make with the enamel-dentine junction. Previous research suggests, but has not yet established, that these angles reflect aspects of primate biology related to their pace of growth and development, most notably brain and body size. The present study tested this possibility on histological sections using phylogenetically-controlled and Bonferroni-corrected analyses spanning a broad taxonomic range. Ten species were represented in the analysis of anterior teeth; 17 in the analysis of posterior (postcanine) teeth (with varying sample sizes). Also, tested was the relationship of EFF angles to striae of Retzius periodicity (long period growth rhythms in enamel) and degree of folivory, as both factors are related to primate developmental rates. Finally, several analyses were conducted to investigate whether tooth size (operationalized as EDJ length) might mediate these relationships. Central results are as follows: (1) Relationships between EFF angles and brain weight (anterior teeth) and between EFF angles and body mass (anterior and posterior teeth) are statistically significant and (2) Mid-crown EFF angles are not statistically significantly related to EDJ lengths. These results suggest that tooth size does not mediate relationships between EFF angles and brain weight/body mass and are discussed with respect to underlying enamel growth variables (especially rates of enamel extension and secretion). Anat Rec, 2017. (c) 2017 Wiley Periodicals, Inc. Anat Rec, 301:125-139, 2018. (c) 2017 Wiley Periodicals, Inc.