Conclusion There are 2 gingival morphological types of maxillary anterior tooth segment in Han Chinese. There is racial difference on gingival morphological characteristics.

结论：在中国汉族人群中上前牙牙龈形态有2种类型，牙龈形态特征存在种族差异。

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This paper illustrated the characters about root canal morphology of mandibular premolars, including the formation, configurations, racial difference, classification and methods for study.

本文简要介绍下颌前磨牙多种解剖结构的形成、形态特点、人种差异、分型和研究方法。

youdao

This paper illustrated the characters about root canal morphology of mandibular premolars, including the formation, configurations, racial difference, classification and methods for study.

本文简要介绍下颌前磨牙多种解剖结构的形成、形态特点、人种差异、分型和研究方法。

youdao