我们对１３９例下颌阻生第三磨牙Ｘ线片与临床观察进行对比分析，结果如下。临床资料１取材：随机选取１３９张阻生下颌第三磨牙Ｘ线片。其中男８５例，女５４例，左侧６１例，右侧７８例。２阻生类型：根据阻生智齿与下颌第二磨牙长轴方向的关系分为近中阻生（Ｍ）、... 139 cases of mandibular impacted third molars X-ray film and clinical observations were compared, the results are as follows. Clinical data 1  Materials: 139 randomly selected impacted mandibular third molar X-ray film. There were 85 males and 54 females, 61 on the left and 78 on the right. 2  Type of impaction: According to the relationship between impacted wisdom teeth and mandibular second molar direction is divided into near-middle implosion (M), ...