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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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