Spatial relationship between the mental foramen and mandibular developing teeth in modern humans, chimpanzees, and hamadryas baboons
Spatial relationship between the mental foramen and mandibular developing teeth in modern humans, chimpanzees, and hamadryas baboons
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现代人类、黑猩猩和狒狒的颏孔和下颌发育牙齿之间的空间关系
DOI：
10.1002/ajpa.22548
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
FUKASE Hitoshi
中科院分区：
文献类型：
--
作者：
岡本朋子;奥山雄大;保坂哲朗;FUKASE Hitoshi
与非人灵长类动物相比，成人下颌骨颏孔（MF）具有较高的位置和后上开口方向的特点。在这项研究中，为了研究在牙齿发育的背景下，这种MF位置/取向的物种间变化何时以及如何表现出来，我们使用CT扫描的生长系列下颌骨来评估MF和附近形成的牙齿（dc, dm1， C, P3）之间的位置关系，这些下颌具有不同的MF位置和前牙大小：现代人类，黑猩猩和hamadryas狒狒。结果表明，现代人在生长过程中比两种非人类样本具有更多的前优越位置的MF和dc，而hamadryas狒狒的MF和dm1是最劣等位置的。考虑到婴儿期下颌管通常达到dc/dm1位置，因此MF位置的物种差异很大程度上归因于乳牙最初出现的位置。具体地说，现代人类独特的牙齿位置最终应该源于相对较小的前牙大小。此外，与非人类样本不同，人类MF的位置随着牙槽发育而轻微向上移动，并伴有下颌前管的强烈弯曲和垂直伸长。同时，人类MF从前向转向侧/后向，这与人类特异性生长相关的肺泡萎缩有关。因此，本研究的结果共同表明，成人MF位置/取向的分类差异可以部分地通过周围发育牙齿的位置来解释。[J] .中国生物医学工程学报，2014,34(4):534 - 534。©2014 Wiley期刊公司
The mental foramen (MF) of adult human mandibles is characterized by its high position and posterosuperior opening orientation, compared with that of nonhuman primates. In this study, to examine when and how such interspecies variations in MF position/orientation are manifested in the context of dental development, positional relationships between the MF and nearby forming teeth (dc, dm1, C, P3) were assessed using CT‐scanned growth‐series mandibles of the following three species with various MF positions and anterior dental sizes: modern humans, chimpanzees, and hamadryas baboons. Results showed that modern humans have more antero‐superiorly located MF and dc than the two nonhuman samples during growth, whereas the MF and dm1 of hamadryas baboons are the most inferiorly positioned. Considering that the mandibular canal generally reaches the dc/dm1 position during infancy, the species differences in MF position can be attributed largely to the positions where the anterior deciduous teeth first appear. Specifically, the distinctive dental position of modern humans should stem eventually from the comparatively small anterior dental size. Furthermore, human MF position shifted slightly upwards with alveolar development, unlike in the nonhuman samples, accompanied by strong curvature and vertical elongation of the anterior mandibular canal. Meanwhile, the human MF shifted from a forward to a lateral/backward orientation in association with human‐specific growth‐related alveolar recession. The findings of this study, thus, collectively indicate that taxonomic variations in adult MF position/orientation can be interpreted partly by the positions of the surrounding developing teeth. Am J Phys Anthropol 154:594–603, 2014. © 2014 Wiley Periodicals, Inc.