下颌尖牙阻生一般于原牙位附近,偶有位于下切牙牙根之下者,但移位至对侧阻生者罕见[1]。笔者在临床遇见1例,报告如下:患者,女,14岁,替牙牙合,上颌牙列Ⅲ度拥挤,下牙列Ⅱ度拥挤,下颌中线左偏2 mm,左下颌乳尖牙滞留,尖牙缺失。全颌曲面断层片示:左下颌尖牙埋伏阻生,异位于下颌颏部 Mandibular canine impaction is generally in the vicinity of the original tooth, occasionally under the root of the incisors, but the shift to the opposite side of the resistance is rare [1]. I met a clinical case, the report is as follows: The patient, female, 14 years old, for dental occlusion, maxillary dentition Ⅲ degree crowded, lower dentition Ⅱ degree crowded left mandibular midline left deviation 2 mm, left mandibular canine tooth retention, tip Lack of teeth. Whole jaw curved surface shows: Left mandibular canine impacted obstruction, different from the mandibular chin