Wu L, Turner C G
Institute of Vertebrate Paleontology and Paleoanthropology, Academia Sinica, Beijing, China.
Am J Phys Anthropol. 1993 Jun;91(2):245-8. doi: 10.1002/ajpa.1330910210.
The frequency and form of the middle trigonid crest (MTC) in lower permanent molars is reported for 1,131 dental casts of Bushman (San), Bantu, Solomons, Hawaiians, Pima, Eskimo, Navajo, Chinese, and American whites. The MTC occurs most often on the first molar. We found very little intra-trait variation, so observations were scored on a present-absent basis. The MTC is most frequent in the African samples and rare in those of the other populations. Two reference plaques can be obtained to add to the existing series in the ASU dental anthropology system.
报告了1131例布什曼人（桑人）、班图人、所罗门人、夏威夷人、皮马人、爱斯基摩人、纳瓦霍人、中国人和美国白人的下颌恒牙磨牙中三角嵴（MTC）的频率和形态。MTC最常出现在第一磨牙上。我们发现性状内变异很少，因此观察结果按存在与否进行评分。MTC在非洲样本中最常见，而在其他人群样本中则很少见。可以获得两个参考牙斑，以添加到亚利桑那州立大学牙齿人类学系统的现有系列中。
