安氏I类错牙合 中第一磨牙缺失矫治设计的探讨 齿科美容-齿科美容-美容前线 关键词]第一磨牙； 拔牙矫治； 牙列拥挤 [gap=1178]Key words: the first molars; extraction therapy; dentia crowding
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Objective To measure the thickness of the first molars.
目的了解正常青壮年第一磨牙的牙体厚度。
Objective: To measure the thickness of enamel and dentin of the first molars.
目的：了解上下颌第一磨牙牙釉质及牙本质的厚度。
Permanent teeth begin appearing around age 6, starting with the first molars and lower central incisors. This process continues until approximately age 21.
恒牙萌出于6岁左右，开始于第一恒磨牙以及下颌第一中切牙。这个过程一直持续到将近21岁。
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