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首页> 外文期刊>Anthropological science: Journal of the Anthropological Society of Nippon >Dental microevolution in Portuguese Neolithic and modern samples using an alternative morphometric analysis
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Dental microevolution in Portuguese Neolithic and modern samples using an alternative morphometric analysis

机译：使用替代形态计量学分析葡萄牙新石器时代和现代样本中的牙齿微演化

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Most studies of dental microevolution have used the standard methodologies employed in dental anthropology: buccolingual/mesiodistal lengths and the frequencies of non-metric dental traits. In this work we use the occlusal polygon method which is based on a polygon created by linking the four molar cusp apices using digital analysis. This method has been used to identify different evolutionary trends in Neandertal and modern humans; our objective was to assess the existence of changes in the occlusal polygon area, and thus the general morphology of first upper molars, between two Portuguese samples from the Late Neolithic (4130 ± 90 BP) and the early 20th century. This method allows us to evaluate both tooth size and relative cusp position in the occlusal plane. Contrary to the accentuated tooth size reduction commonly found from the past 10000 years using buccolingual/mesiodistal measurements, no statistically significant change of the total occlusal area of the crown was observed between these samples. Nevertheless, we report an increase of 7.45% in the size of the occlusal polygon and hence 9.38% in its relative area, from 27.30% of the total crown area to 30.30% over this time span. This result implies that microevolutionary changes among Portuguese populations led to changes in the positions of the cusps relative to one another in the first upper molar, whereas the location of their apices have moved away from the centre of the crown to a more peripheral position. This apparent increasing trend contrasts with the one reported in studies of both Neandertals and modern humans.
机译：牙齿微观进化的大多数研究都使用了牙齿人类学中使用的标准方法：颊舌/近距长度和非公制牙齿特征的频率。在这项工作中，我们使用基于多边形的咬合多边形方法，该多边形是通过使用数字分析将四个磨牙尖尖顶点链接在一起而创建的。该方法已被用于识别尼安德特人和现代人类的不同进化趋势。我们的目的是评估在新石器时代晚期（4130±90 BP）和20世纪初的两个葡萄牙样本之间，咬合多边形区域是否存在变化，从而评估了第一上部磨牙的一般形态。这种方法使我们能够评估牙齿的大小和在咬合面中的相对尖瓣位置。与过去的10000年使用颊舌/近中距测量法发现的加重牙齿尺寸减小相反，在这些样品之间未观察到牙冠总咬合面积的统计学显着变化。尽管如此，我们报告在此时间段内，咬合多边形的大小增加了7.45％，相对面积增加了9.38％，从总牙冠面积的27.30％增至30.30％。这一结果表明，葡萄牙种群之间的微进化变化导致了第一尖磨牙中尖齿相对于彼此的位置发生了变化，而其尖尖的位置已经从冠的中心移到了更边缘的位置。这种明显的增长趋势与尼安德特人和现代人类研究中报道的趋势形成鲜明对比。

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