In anthropology, Sinodonty and Sundadonty are two patterns of features widely found in the dentitions of different East Asians.
Tsunehiko Hanihara (1993) believed that the dental features of Aboriginal Australians have the characteristic of high frequencies of "evolutionarily conservative characteristics," which he called the "proto-sundadont" pattern, as he believed that the dental pattern of Aboriginal Australians was ancestral to that of Southeast Asians.
[6] Ryuta Hamada, Shintaro Kondo and Eizo Wakatsuki (1997) said, on the basis of dental traits, that Mongoloids are separated into sinodonts and sundadonts, which is supported by Christy G. Turner II (1989).
[10] Turner found the Sinodont pattern in the Han Chinese, in the inhabitants of Mongolia and eastern Siberia, in the Native Americans, and in the Yayoi people of Japan.
[14] In the 1990s, Turner's dental morphological traits were frequently mentioned as one of three new tools for studying origins and migrations of human populations.
Today, the largest number of references to Turner's work are from discussions of the origin of Paleo-Amerindians and modern Native Americans, including the Kennewick Man controversy.