Preliminary observations on increasing root length during the eruptive phase of tooth development in modern humans and great apes
Preliminary observations on increasing root length during the eruptive phase of tooth development in modern humans and great apes
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DOI：
10.1016/j.jhevol.2007.09.021
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发表时间：
2008-02-01
影响因子：
3.2
通讯作者：
Vesey, Peter
中科院分区：
文献类型：
--
作者：
Dean, M. Christopher;Vesey, Peter
选择门牙、犬齿和磨牙的地面切片，在牙根质上显示明显的增量标记。该样本包括98个智人，53个泛穴居人，以及51个大猩猩和庞戈人的有限组合样本。根本质形成的每日速率，以及靠近牙水泥-牙本质交界处（CDJ）的根中增量标记的方向，被用来计算牙釉质颈外形成的根的前10mm的根扩展速率。与类人猿相比，现代人的前牙根在牙根长度上的增长更有规律。在Pan，根系生长迅速上升到较高的速度，但随后趋于平缓。现代人类生长速度最快的是门牙根（每天10-12亩），其次是犬科（每天8-9亩）。Pan的扩展率在犬科（类似于每天12-14亩）中略高于门齿（类似于每天10-11亩）。现代人类和类人猿的臼齿根都以非线性的方式生长。磨牙的峰值速率从M1降低到M3（分别为每天8、7和6 μ m）。与人类一样，潘的根系生长在m1中以每天晚上8 - 9点的速度达到高峰，而在m3中以每天7 - 8亩的速度达到高峰。大猩猩和蓬戈猴磨牙的有限数据集表明，它们的磨牙扩展率通常比潘猴高约1.0-1.5 μ m / d。两种植物的扩展率差异较大，大猩猩和庞戈的扩展率比潘戈高2.5 ~ 4.5 μ m / d。这些发现首次强调了不同牙齿类型和不同分类群的牙根生长速率在模式和速率上的差异。它们为进一步探索根生长、颌生长和出牙过程之间的潜在比较关系提供了基础。(C) 2007 Elsevier Ltd.版权所有。
Ground sections of incisors, canines, and molars were selected that showed clear incremental markings in root dentine. The sample comprised 98 Homo sapiens, 53 Pan troglodytes, and a more limited combined sample of 51 Gorilla and Pongo sections. Daily rates of root dentine formation, together with the orientation of incremental markings in roots close to the cement-dentine junction (CDJ), were used to calculate root extension rates for the first 10 mm of root formed beyond the buccal enamel cervix. Modern human anterior tooth roots showed a more regular pattern of increase in root length than those in great apes. In Pan, root growth rose quickly to higher rates but then flattened off. The fastest extension rates in modem humans were in incisor roots (10-12 mu m per day), followed by canines (8-9 mu m per day). Extension rates in Pan rose to slightly greater values in canines (similar to 12-14 mu m per day) than in incisors (similar to 10-11 mu m per day). Molar tooth roots in both modem humans and great apes grew in a nonlinear manner. Peak rates in molars reduced from M1 to M3 (8, 7, and 6 mu m per day, respectively). Like humans, root growth in Pan peaked earlier in M1s at rates of between 8 and 9 pm per day, and later in M3s at rates of 7 to 8 mu m per day. The more limited data set for Gorilla and Pongo molars suggests that extension rates were generally higher than in Pan by approximately 1.0-1.5 mu m per day. There were greater differences in peak extension rates, with Gorilla and Pongo extension rates being between 2.5 and 4.5 mu m per day higher than those in Pan. These findings highlight for the first time that root growth rates differ between tooth types in both pattern and rate and between taxa. They provide the basis with which to explore further the potential comparative relationships between root growth, jaw growth, and the eruption process. (C) 2007 Elsevier Ltd. All rights reserved.