Dental Anthropology on the Formation of Sundadont

1)使用松户日本大学牙科学院的牙模对巴布亚新几内亚高地人进行公制或非公制测量。(1)利用我们的评分系统观察上切牙的非测量特征，包括切结节和棘突。高地人具有这些特征的频率很高，就像在澳大利亚土著人中看到的那样。但铲形切牙出现的频率较低。(2)其他非计量性状也进行了研究，与一些太平洋种群，包括斐济，萨摩亚，基里巴斯，帕劳。新几内亚高地人第6尖出现频率低。(3)测量研究表明，远侧牙尖面积的下第一磨牙在高地人显着小于澳大利亚人。2）对云南省少数民族的牙齿特征进行了调查。1999年5月，中国昆明古脊椎动物研究所纪学平研究员进行了初步研究。调查于2000年2月27日至3月8日在云南省元江县进行。少数民族有哈尼族和傣族。从这些部落中采集了总共200个牙齿模型和龋齿频率。牙模现在正在实验室里测量。

1) Metric or non-metric measurement of Papua New Giniea Highlanders were carried out with the use of dental casts housed in Nihon University School of Dentistry at Matsudo.(1) Non-metric traits of the upper incisors including incisal tubercles and spinal process were observed with our scoring system. Highlanders had high frequencies of these traits as seen in Australian Aborigines. However, the frequency of shovel shaped incisor was low.(2) Other non-metric traits were also investigated in the comparison with some Pacific populations including Fiji, Samoa, Kiribati, Palau. The low frequency of 6th cusp were noted in New Guinea Highlanders.(3) Metric study of the cuspal area of the lower first molar demonstrated that distal cusps in Highlanders were significantly smaller than Australians. This suggested that the distal part of the first molar in Highlanders were reduced in their micro-evolution.2) Investigation on the dental characters in minorities in China living in Yunnan Province was conducted. Preliminary research was carried out in May, 1999 with Chinese researchers, Ji Xueping, Kunming Paleovertebrate Institute. The survey was held in Yuenjian in Yunnan Province from February 27 to March 8, 2000. Minority peoples are from Hani tribe and Dai tribe. Dental casts of 200 in total and dental caries frequency were taken from these tribes. Dental casts were now being measured in the laboratory.