Premolar - Premolar

Japanese: 臼前歯 - きゅうぜんし
Premolar - Premolar

…Humans have eight deciduous teeth, two on each side of the jaw, and five permanent teeth, a total of 20. The five permanent molars are substitutes for the deciduous molars, and consist of two bicuspids, also called premolars, and three molars, which are considered to be deciduous teeth in embryology. The substitutes for the molars have already degenerated. …

*Some of the terminology that refers to "premolar teeth" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ヒトの乳歯には左右上下のあごに各2本合計8本,永久歯には各5本合計20本ある。各5本の永久臼歯は,乳臼歯deciduous molarisの代生歯であり,臼前歯とも呼ばれる小臼歯bicuspids各2本と,発生学的には乳歯と考えられる大臼歯molaris3本からなる。大臼歯の代生歯はすでに退化してしまっている。…

※「臼前歯」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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