Tooth size in two Chinese Minorities, the Hani and Dai Tribes of Yunnan Province

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In 2001, we carried out a dental anthropological survey of two Chinese minorities in Yuen Jian, in Yunnan Province. The subjects were young adults of the Hani and the Dai tribes, who historically derive from Tibetan and Southeast Asian regions, respectively, and from whom dental impression models were collected. Tooth measurements were made, using a digital caliper with the precision of 0.01 mm, on the mesiodistal and buccolingual diameters. Sexual dimorphism was weak : sex differences were present in both the Hani and the Dai in the upper and lower canines, but not in other teeth. Also, male teeth were larger than female in the mesiodistal diameters, especially of the upper and lower incisors and premolars. There were some significant differences between the Hani and the Dai : for example, the buccolingual diameters of the lower I1 and the upper incisors were larger in the Hani, in both sexes, while the Dai had larger lateral teeth in both males and females. The measurements were compared with those in other Asian peoples. A principal components analysis showed, on a size factor, that teeth in the Hani and Dai were generally smaller than in other Asian racial sub-groups, such as the Japanese and Philippinos ; but in males only they were larger than those of Philippine Negritos. The Hani, both males and females, have intermediate sized teeth compared with other Asian sub-groups. Anthropological affinities between the Hani and Dai were suggested by position on two shape factors resulting from the analysis.

Tooth size in two Chinese Minorities, the Hani and Dai Tribes of Yunnan Province

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