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什麽是“六齡齒”?兒童到了 6周歲,在牙列的最後面即在第二乳磨牙的後面萌 出的牙,就是第一恒磨牙,胚胎3?4個月左右第一恒磨牙牙胚開 始形成,出生時開始鈣化,2?3歲左右牙冠鈣化完成.6?7歲萌岀 于口腔內,上下左右各一顆,因其在6歲左右萌出,所以習慣稱爲
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