…First, teeth are divided into the crown and the root. Anatomically, the crown is the area covered by enamel (formerly called enamel), while the root is the area that lacks enamel and is covered by cementum. The transition area between the crown and root is called the neck, which is usually slightly constricted and is normally surrounded by the free gums, so part of the crown is below the gum line. … *Some of the terminology explanations that mention "cementum" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…まず歯は歯冠と歯根に分けられる。歯冠は解剖学的にはエナメル質enamel(かつてはホウロウ質といわれた)でおおわれている範囲をいい,歯根はエナメル質を欠き,セメント質cementumでおおわれている範囲をいう。歯冠と歯根の移行部を歯頸といい,ふつう少しくびれていて,正常状態では自由歯肉で取り巻かれているので,歯冠の一部は歯肉縁下にある。… ※「cementum」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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