上颌第三磨牙和上颌尖牙分别是第二及第三常见的部位。
The maxillary third molars and maxillary canines are the second and third most common areas of occurrence, respectively.
影响上颌第三磨牙牙根型的主要因素是牙冠最大周径，而不是牙尖型；
The main fact to influence the types of roots of Maxillary third molar was the largest circumference of crown, not the types of cusps.
人类的智齿就是第三大臼齿，通常有四颗，包括下颌第三磨牙和上颌第三磨牙。
A wisdom tooth is in humans any of the usually four third molars, including mandibular third molar and maxillary third molar.
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.
上下颌第三磨牙牙胚绝大多数已形成且牙冠已钙化完成，其出现率为上颌84 0 % ，下颌85 2 % ；
Most of the third molar embryo had been formed and their tooth crowns had been calcified, the occurrence ratio was 84 0 % in maxilla and 85 2 % in mandible.
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.
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
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