女性恒牙萌出时间一般都较男性早；
恒牙萌出有一定的规律，主要表现在时间和顺序两个方面。
The eruption of permanent teeth has certain characteristics, mainly temporal and sequential.
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。
Permanent teeth begin appearing around age 6, starting with the first molars and lower central incisors. This process continues until approximately age 21.
恒牙萌出的情况不仅能反映生长发育的状况，而且随着恒牙萌出数的增多，错牙合畸形的发生率也随之增高。
We also demonstrated that the incidence of malocclusion increased with the increase of the Numbers of erupted permanent teeth.
乳恒牙替换是动物牙齿及颌面部生长发育的重要阶段，包含有乳牙根、牙槽骨的吸收、恒牙胚的发育和恒牙萌出等一系列复杂的生理过程。
The replacement of primary and permanent teeth is an important part that belongs to the growth and development of animals' teeth and maxillofacial region.
乳恒牙替换是动物牙齿及颌面部生长发育的重要阶段，包含有乳牙根、牙槽骨的吸收、恒牙胚的发育和恒牙萌出等一系列复杂的生理过程。
The replacement of primary and permanent teeth is an important part that belongs to the growth and development of animals' teeth and maxillofacial region.
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