Comparative Cultures Collegium, Eckerd College, St. Petersburg, FL 33711, USA.
Am J Phys Anthropol. 2010 Feb;141(2):319-24. doi: 10.1002/ajpa.21230.
The purpose of this brief communication is to report the results of an analysis of maxillary premolar accessory ridges (MxPAR), a common but understudied accessory ridge that may occur both mesial and distal to the central ridge of the buccal cusp of upper premolars. We developed a new five-grade scoring plaque to better categorize MxPAR variation. Subsequently, we conducted a population analysis of MxPAR frequency in 749 dental casts of South African Indian, American Chinese, Alaskan Eskimo, Tohono O'odham (Papago), Akimel O'odham (Pima), Solomon Islander, South African Bantu, and both American and South African Whites. Northeast Asian and Asian-derived populations exhibited the highest MxPAR frequencies while Indo-European samples (South African Indians, American and South African Whites) exhibited relatively low frequencies. The Solomon Islanders and South African Bantu samples exhibited intermediate frequencies. Our analysis indicates that statistically significant differences in MxPAR frequency exist between major geographic populations. As a result, the MxPAR plaque has now been added to the Arizona State University Dental Anthropology System, an important contribution as maxillary premolar traits are underrepresented in analyses of dental morphology.
本简讯旨在报告对上颌前磨牙副嵴（MxPAR）分析结果的报告，这是一种常见但研究不足的副嵴，可能在上颌前磨牙颊尖中央嵴的近中和远中都有发生。我们开发了一种新的五级评分斑块，以更好地对 MxPAR 变异进行分类。随后，我们对南非印第安人、美国华人、阿拉斯加爱斯基摩人、托霍诺奥哈姆（帕帕戈）、阿基梅奥哈姆（皮马）、所罗门岛民、南非班图人和美国及南非白人的 749 个牙模进行了 MxPAR 频率的人群分析。东北亚和亚洲血统的人群表现出最高的 MxPAR 频率，而印欧人群（南非印第安人、美国和南非白人）则表现出相对较低的频率。所罗门岛民和南非班图人的样本表现出中间频率。我们的分析表明，主要地理人群之间的 MxPAR 频率存在统计学上的显著差异。因此，MxPAR 斑块现已被添加到亚利桑那州立大学牙体人类学系统中，这是一个重要的贡献，因为上颌前磨牙特征在牙体形态学分析中代表性不足。
