A wisdom tooth is in humans any of the usually four third molars, including mandibular third molar and maxillary third molar.
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。
The main fact to influence the types of roots of Maxillary third molar was the largest circumference of crown, not the types of cusps.
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；
Conclution More mesially inclined maxillary molars are likely to be associated with third molar eruption.
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。
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