Dental Anthropological Study of Mongoloid in China

本研究的目的是评估中国居民的颅面和咬合特征。这些资料包括来自517名居民的脑电图、胸片、牙模和人类学测量：416名来自北京、上海、广州和长春的汉人，以及101名来自呼和浩特的蒙古人。这些数据在上述五个地区之间以及与日本的数据进行了比较。研究结果总结如下：1。颅面特征；a)汉族和蒙古族表现为短头畸形。(2)与其他地区相比，广州地区具有双颌突出的趋势，面部高度较小，而长春地区具有较大的面角，面部高度较大。(3)蒙古人的鞍角和双棱宽度值较大。d)与日本人相比，他们颅面复合体的特征是面角较大，下颌平面角较小，角角较小。e)与儿童相比，成人上切牙的角小，支倾角大，唇倾角大。f)与女性相比，男性的下颌平面角和上切牙唇倾角较大。咬合特征；a)中国居民在牙弓形态和牙特征频率上有相似的趋势。b)北京地区居民的前牙中远端冠径大于其他地区居民。c)与日本人相比，北京地区居民的前牙中远端冠径较小（尤其是在上第一磨牙上），铲状齿的发生率较高，Carabelli’s结核的发生率较低。d)成人的牙弓长度比儿童短，男性的牙弓长度比女性宽。

The purpose of this study was to evaluate the craniofacial and occlusal characteristics of the inhabitants in China.The material consisted of cephalograms, pantomograms, dental casts and anthropological measurements taken from 517 inhabitants : 416 Han Chinese in Beijing, Shanghai, Guangzhou and Changchun and 101 Mongolians in Hohhot. The data were compared among the above five regions and also with the Japanese data.The findings were summarized as follows :I. Craniofacial characteristics ;a) The Han Chinese and the the Mongolians showed brachycephaly.b) The inhabitants in Guangzhou showed a tendency of bimaxillary protrusion with a smaller facial height, and the inhabitants in Changchun showed a larger gonial angle with a larger facial height than those of the other regions.c) The Mongolians had a larger value of the saddle angle and of the bigonial breadth.d) Compared with the Japanese, their craniofacial complex was characterized by a larger facial angle, smaller mandibular plane angle and a smaller gonial angIe.e) The adults had a smaller gonial angle, a larger ramus inclination and a larger labial inclination of upper incisors, compared with the children.f) The male had a larger mandibular plane angle and a larger labial inclination of upper incisors, compared with the female.II. Occlusal characteristics ;a) The inhabitants in China had similar tendency in the dental arch form and in the dental trait frequency.b) The inhabitants in Beijing had larger mesiodistal crown-diameter of the anterior teeth than those in other regions.c) Compared with the Japanese, their teeth were characterized by a smaller mesiodistal crown-diameter (especially on the upper first molar), higher frequency of shovel-shape and lower frequency of Carabelli's tuberculum.d) The adults had shorter dental arch length compared with the children, and the male had wider dental arches compared with the female.