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牙齒分爲哪幾類？

Posted By vickong pun     July 7, 2021    

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牙齒分爲哪幾類？

　　

　　牙齒分爲哪幾類？牙齒有兩種分類方法：一種分類是根據牙齒的形態特點和功 能特性分爲切牙、尖牙、前磨牙和磨牙。
切牙和尖牙在口角之前， 所以稱爲前牙；前磨牙和磨牙在口角之後，所以稱爲後牙.切牙在 口腔前部，上下左右共8顆。
尖牙俗稱犬齒，在口角處，上下左右 共4顆。

前磨牙在尖牙之後、磨牙之前，上下左右共8顆，磨牙在 前磨牙之後，上下左右共12顆。
另一種分類是根據牙齒在口腔內 存在時間的久暫，分爲乳牙和恒牙.

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