畸形融合牙中,以乳牙较为常见,而恒牙发生于下颌第三磨牙与远中额外牙融合者较为少见,我科曾收治一例,现报道如下: 患者男,20岁,因右下后牙反复肿胀,疼痛来我科就诊。检查牙列整齐,(?)远中向阻生,无龋,远中 Deformity fusion teeth to the deciduous teeth are more common, and permanent teeth occur in the mandibular third molars with distal extraoral fusion is rare, our department had admitted a case, are reported as follows: The patient male, 20 years old, due to lower right posterior teeth Repeated swelling, pain to our department. Check dentition neatly, (?) Far to obstruction, caries-free, far