Takei T, Hamada N, Toh H, Ohmori T
Fukuoka Shika Daigaku Gakkai Zasshi. 1989;16(1):44-51.
Mesiodens is one supernumerary tooth which appears in upper intra-central incisors. This tooth was originally described by Bolk (1917) who proposed the term 'mesiodens'. We investigated the incidence of mesiodens for the Paiwan tribe of Formosan aborigines (9 tribes) living in the mountain area of Taiwan. We have been continued to research on these tribes as viewed from dental anthropology. The materials used in this study were plaster casts of 152 males and 238 females (dental age: IIIA or over). The samples of the Paiwan tribe were selected from the dental casts obtained at Taitung and Pingtung (Machia and Wutai) in southern Taiwan. The results were as follows: 1. The occurrence of the erupted mesiodens in the upper incisal region was five cases (3.3%) in males, but was none in females. This tendency of incidence was much the same as that of Japanese. 2. The mesiodens was of rudimentary form: four cases (80%) showed conical-shaped type and the rest case was the sort of incisor. 3. In the incidence of the erupted mesiodens, the Paiwan tribe showed significantly higher than Japanese.
正中牙是出现在上颌中切牙区的一颗多生牙。这颗牙齿最初由博尔克（1917年）描述，他提出了“正中牙”这个术语。我们调查了居住在台湾山区的台湾原住民排湾族（9个部落）正中牙的发生率。从牙齿人类学的角度来看，我们一直在对这些部落进行研究。本研究使用的材料是152名男性和238名女性（牙齿年龄：IIIA及以上）的石膏模型。排湾族的样本是从台湾南部台东和屏东（玛家、雾台）获得的牙模中选取的。结果如下：1. 上颌切牙区萌出正中牙的发生率，男性为5例（3.3%），女性则无。这种发生率趋势与日本人的大致相同。2. 正中牙呈发育不全的形态：4例（80%）呈圆锥形，其余1例为切牙类型。3. 在萌出正中牙的发生率方面，排湾族显著高于日本人。
