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什麽是恒牙？恒牙有多少顆？

Posted By vickong pun     July 9, 2021    

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什麽是恒牙？恒牙有多少顆？

　　什麽是恒牙？恒牙有多少顆？人的一生中共有兩副牙齒，即乳牙和恒牙.乳牙是人的第一 副牙齒，恒牙是人的第二副牙齒。
6歲左右第一恒磨牙在第二乳 磨牙的遠側萌岀,是最先萌出的恒牙，不替換任何乳牙. 6?7歲 以後.直到12?13歲，乳牙逐漸被恒牙所替換。

恒牙出齊後，正常 情況下共冇28?32顆，分別稱爲恒中切牙、恒側切牙、恒尖牙、第 一雙尖牙、第二雙尖牙.以及第一、二、三磨牙。
正常人恒牙是一生 中的最後一副牙齒，如果因爲各種原因導致恒牙脫落.就不會有新 生牙齒替代’因此保護恒牙極爲重要。
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