REGIONAL VARIATIONS IN THE RYUKYU ISLANDERS ON TOOTH CROWN TRAITS

琉球岛民牙冠特征的地区差异

基本信息

批准号：
10671705
负责人：
KOBAYASHI Shigeru
金额：
$ 1.86万
依托单位：
KYUSYU DENTAL COLLEGE
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10671705/
关键词：
RYUKYU ISLAND ASU SYSTEM SINODONTY SUNDAONTY ISHIGAKIJIMA MIYAKOJIMA METRICAL TOOTH CROWN TRAITS NONMETRIC TOOTH CROWN TRAITS AUS System Sundadonty 歯の計測前歯群

项目摘要

A genealogical positioning of the Okinawa main land, Miyakojima and Ishigakijima populations in East Asia and Japan was carried out by using metrical and 17 nonmetric tooth crown traits. Dental plaster casts were collected from teen-aged modern inhabitants of the Okinawa main land, Miyakojima and Ishigakijima of the Ryukyu islands.The dentition of the Ryukyu islanders were metrically examined in terms of inter island variation and biological population affinity. Measurements were taken of the tooth crown diameter of the inhabitants in Miyakojima and Ishigakijima and compared with those of another region. Mesiodistal and labio(bucco)lingual crown diameters of all anterior teeth in Miyakojima and Ishigakijima were smaller than in Okinawa. The crown diameters of all teeth in Ishigakijima were smaller than in Miyakojima.The upper and lower first molars are the largest and the most stable teeth in the mesiodistal and bucculingual crown diameters and crown area, while the upper second premol … More ar and the lower first premolar the smallest on the Miyakojima and the Ishigakijima populations. The upper and lower second premolars are proportionately the largest teeth in the crown index. The buccolingual crown diameter and crown area were larger for male than female, showing significant sex difference, premolars and molars except upper second molar, on the Miyakojima, and upper first premolar, upper second molar, lower first and second molars on the Ishigakijima populations.In Ryukyu islands, tooth sizes were correlated with geographical locations. But when compared with posterior region the sizes of Miyakojima and Ishigakijima were geographically correlated, and another not. Metrical dental characters of the Miyakojima and Ishigakijima populations were compared with these from the others. The Miyakojima populations show close affinities to the Tanegashima and Yayoi populations, and the Ishigakijima similar to the Ainu and Jomon populations.Incidences of 17 nonmetric tooth crown traits were investigated on dental plaster casts which collected from teen-age modern inhabitants of the Okinawa main land and Ishigaki island of the Ryukyu islands. The incidences of the Okinawa main land and Ishigaki islands were compared with other 11 Japanese populations and other 35 Asian-derived populations. In East Asian populations, Okinawa main land and Ishigakiisland had intermediate characters between the northeast Asian(Sinodonty)and the Southeast Asian(Sundadonty). In the Japanese populations, three Ryukyu islands were overwhelmingly similar to the migrant group(Yayoi period in north Kyusyu, the Jomon period, and the modern Hokkaido Ainu). However, the residence of Sundadonty such as Jomonese in Tanegashima on of the Yayoi period suggests a residence of Sundadonty in past Ryukyu islands and late migration on Sinodonty to Ryukyu islands. In modern Ryukyu poppulations, the Ishigaki and the Okinawa main islanders show affinities to the Yayoi period in north Kyusyu and the modern Tanegashima populations, and largely differ from the modern Hokkaido Ainu, the Jomon period and the Yayoi period in Tanegasima.Some amount of cline from north to south in the Ryukyu islands might indicate the gene flow of Sinodonty from the northward. The dental evidences shown in this study may contribute to the establishment of biological relationships between Miyakojima and Ishigakijima populations. Less

通过使用从冲绳本岛、宫古岛和石垣岛的青少年现代居民收集的公制和 17 个非公制牙冠特征，对冲绳本岛、宫古岛和石垣岛人口进行了谱系定位。琉球群岛的石垣岛。根据岛间变异和生物种群亲和力对琉球岛民的牙列进行了测量。对宫古岛和石垣岛居民的牙冠直径进行了测量，并与其他地区的牙冠直径进行了比较，宫古岛和石垣岛所有前牙的牙冠直径均小于冲绳县的牙冠直径。石垣岛的所有牙齿都比宫古岛的小。上下第一磨牙是岛上最大、最稳定的牙齿近远中和颊舌牙冠直径和牙冠面积，而宫古岛和石垣岛人群的上第二前磨牙和下第一前磨牙在颊舌牙冠指数中比例最小。宫古岛上的前磨牙和磨牙（除上第二磨牙外）男性的牙冠直径和牙冠面积均大于女性，性别差异显着。在琉球群岛，牙齿大小与地理位置相关，但与后牙区相比，宫古岛和石垣岛的大小与地理相关，而另一个则没有。将宫古岛和石垣岛人群的公制牙齿特征与其他人群进行比较，宫古岛人群与其他人群表现出密切的亲缘关系。种子岛和弥生族群，以及与阿伊努族和绳文族族群相似的石垣岛族群。对从冲绳本岛和琉球群岛石垣岛的现代青少年居民收集的牙科石膏模型进行了 17 种非度量牙冠特征的发生率调查。将冲绳本岛和石垣岛的发病率与其他 11 个日本人群和其他 35 个亚洲裔人群进行了比较。冲绳本岛和石垣岛具有介于东北亚（Sinodonty）和东南亚（Sundadonty）之间的中间特征。在日本人口中，三个琉球群岛与移民群体极为相似（九州北部的弥生时代、绳文时代和日本）。然而，弥生时代种子岛的绳纹人等孙多顿人的居住地表明了过去的孙多顿人的居住地。琉球群岛和新齿鱼到琉球群岛的晚期迁徙在现代琉球人口中，石垣岛和冲绳岛的主要岛民与九州北部的弥生时代和现代种子岛人口有密切关系，与现代北海道阿伊努人、绳文时代有很大不同。琉球群岛从北到南的一定数量的进化可能表明了中国齿兽的基因流动这项研究中显示的牙齿证据可能有助于建立宫古岛和石垣岛种群之间的生物学关系。