…When these parallel striations appear on the tooth surface, they become fine, wave-like patterns called circumferential striations. The surface of the enamel is protected by an acid-resistant dental cuticle made of the final secretions of the ameloblasts that formed the prisms, the epithelium of the enamel organ, and the keratinized epithelium of the oral mucosa. Dentin is softer than enamel and a little harder than bone, as it contains only 70% inorganic matter. … *Some of the terminology that mentions the "enamel organ" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この平行条が歯表面に現れたものが周波条と呼ばれる細い波のような紋様である。エナメル質の表面には,小柱をつくったエナメル芽細胞の最後の分泌物やエナメル器の上皮,口腔粘膜の角化上皮などから成る,酸に抵抗性のある歯小皮がエナメル質を保護するかのように存在する。 象牙質は,無機質を70%しか含まないのでエナメル質より軟らかく,骨より少し硬い。… ※「エナメル器」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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