Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Japan.
Eur J Orthod. 2012 Oct;34(5):575-81. doi: 10.1093/ejo/cjr058. Epub 2011 Jul 10.
The aim of this study was to assess morphological differences between early-modern (Edo) Japanese and contemporary Japanese using recently uncovered human female remains at the Ikenohata-Shichikencho site in the Tokyo urban area. In this study, 30 female skeletal remains that still retained the upper and lower first molars and central incisors were selected [early-modern (Edo) Japanese group]. Forty contemporary female Japanese were selected as a control. Analyses by standard methods of geometric morphometrics revealed some morphological differences between the early-modern (Edo) Japanese group and the contemporary Japanese group. For example, the early-modern (Edo) Japanese group exhibited bimaxillary dentoalveolar protrusion, a flat occlusal plane, and a large S-N length. On the other hand, the contemporary Japanese group exhibited slight protrusion of the anterior nasal spine. These findings may be of interest to orthodontists who are studying age variation or temporal differences and could lead to a better understanding of morphological diversity and variability.
本研究旨在利用东京市区池袋原町遗址新发现的人类女性遗骸，评估早期现代（江户）时期和当代日本女性的形态差异。本研究选择了 30 名仍保留上下第一磨牙和中切牙的女性骨骼遗骸[早期现代（江户）时期日本组]。选择了 40 名当代日本女性作为对照组。通过几何形态测量学的标准方法分析发现，早期现代（江户）时期日本组和当代日本组之间存在一些形态差异。例如，早期现代（江户）时期日本组表现出双颌牙牙槽突前突、平坦的咬合平面和较大的 S-N 长度。另一方面，当代日本组表现出前鼻棘的轻微突出。这些发现可能会引起研究年龄变化或时间差异的正畸医生的兴趣，并有助于更好地理解形态多样性和可变性。
