作者检查了11598例20岁以上病人过去治疗前拍摄的全景照片,将阻生牙在X光照片上所显示的病理表现分为四类:1、牙冠周空间X线透射区域宽度至少5mm,且边界清楚者称含牙囊肿;2、X线透射的阴影清楚表明髓室和/或根管增大,但与根面无明显联系者,称为内吸收;3、邻牙牙槽骨垂直破坏超过釉牙骨质界3mm, The author examined 11598 patients over the age of 20 before the treatment of panoramic photographs taken by the patient, the impacted teeth in the X-ray showed pathological findings are divided into four categories: 1, coronal perimeter X-ray transmission area width of at least 5mm, And the clear boundary of the tooth containing cyst; 2, X-ray transmission of the shadow clearly that the pulp chamber and / or root canal increased, but no significant contact with the root surface, known as internal absorption; 3, vertical alveolar bone destruction More than glazed cementum 3mm,