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.
结论第三磨牙萌出与上颌第一、第二磨牙较大的近中倾斜有关。
Conclution More mesially inclined maxillary molars are likely to be associated with third molar eruption.
摘要目的：研究下颌第三磨牙萌出状态与第二磨牙远中邻面龋坏的相关性。
Abstract: Objective: To analyze the correlation between the eruption status of the mandibular third molar and the distal caries in the mandibular second molar.
目的：3年随防观察近中阻生的下颌第三磨牙萌出情况与其倾斜角度的关系。
Objective: To measure changes in angular position and eruption status of mesially impacted mandibular third molars (M3) during 3-year follow-up period.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
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.
关于第三磨牙萌出年龄的研究很少，能够检索到的相关文献只有50年前姜元川教授的报道，距今已有半个世纪。
There are few researches about the erupting age of third molars except some articles reported by professor Jiang Yuan-chuan about 50 years ago.
结果上颌第三磨牙萌出组与未萌出组相比，上颌第一磨牙和第二磨牙更向近中倾斜，而且随年龄的增加倾斜度也变大。
Results Maxillary first and second molars were more mesially inclined in the first group, particularly in the younger subjects (16 ~ 25 years). This inclination increased with age.
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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