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20世纪以来,人类下颌磨牙的牙尖数目与沟型对“牙人类学”的研究起到非常重要的作用。不仅不同种族的牙尖数目和沟型的频数分布不同;即使同一种族而不同民族或不同地区其频数分布也不尽相同。因此,通过对本地区、本民族牙尖数目和沟型的统计分析,与其他地区民族者相比可以研究不同地区、不同民族间的关系;也可研究种族间的亲缘关系;而且有助于进一步探索从猿到人的演变进化过程。国外从19世纪廿年代就开始了这项研究工作,国内尚未见有这方面的研究报告。本
Since the 20th century, the number and ditch type of human mandibular molars play an important role in the study of “dental anthropology”. Not only the number of cuspids and the frequency distribution of furrows vary from race to race, but even in the same race, in different nationalities or in different regions. Therefore, through the statistical analysis of the number of cuspids and ditch patterns in the region and the nation, it is possible to study the relations among different regions and different ethnic groups in comparison with ethnic groups in other regions; it can also study the inter-ethnic relations and help further Explore evolutionary evolution from apes to humans. Abroad from the nineteen ninties began this research work, there is no domestic research report in this area. this