second maxillary segment [昆] 下唇节
·2,447,543篇论文数据，部分数据来源于NoteExpress
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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