Abstract
Nineteen tooth crown traits of Yami tribe, Taiwan Aborigine, were examined and compared with 16 East Asian populations in order to clarify an anthropological position of Yami based on Mongoloid dental variations. In the eight traits which show considerable difference between Sinodonty which is typical of Northeast Asia, and Sundadonty which is typical of Southeast Asia, shoveling (UI1), Y-groove (LM2) and deflecting wrinkle (LM1) of Yami were similar to those of Sinodonty, while winging (UI1), cusp 5 (UM1) and Carabelli's trait (UM1) of Yami were similar to those of Sundadonty. Double shovel (UI1) and 4-cusp (LM2) of Yami lie midway between Sinodonty and Sundadonty. Two major clusters were obtained from a cluster analysis on Smith's MMD among 16 East Asian populations and Yami, based on 19 crown traits. One was a Sinodonty cluster, and the other was a Sundadonty cluster. Yami was included in the Sinodonty cluster. Furthermore, the principal co-ordinate anlysis showed that Yami, in Sinodonty, was nearest to Sundadonty, in contrast to typical Sinodonty. Judging from the above analyses, it was proved that the dentition of Yami was characteristic of both Sinodonty and Sundadonty, and had more resemblance, if anything, to Sinodonty rather than to Sundadonty.
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