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vickong pun
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牙齒由哪幾部分組成

Posted By vickong pun     July 7, 2021    

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牙齒由哪幾部分組成

牙齒由牙冠和牙根兩部分組成。平時在口腔裏我們能夠看見的那一部分就是牙冠。它的顔色爲白色或淡黃色，表面光滑而有光澤。包埋在牙槽骨內的部分就是牙根。它的表面粗糙，缺乏光澤，黃色。牙冠與牙根交界的地方叫作牙頸。年紀稍長的人，由于牙周萎縮，以致有一部分黃色的牙根露出來，磨牙的牙根多爲2～第3個，前牙與前磨牙多爲1個根，多根牙的牙根開始分叉的地方叫根分叉。牙冠上端數個呈錐狀隆起的部分叫牙尖。每個牙根的末端有小孔，叫根尖孔。

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