病例报告患者,男,13岁,主诉:左下乳尖牙未脱落,恒尖牙未萌出。检查见:上颌恒牙列,下颌混合牙列,33未萌,73滞留,Ⅱ度松动;上颌前牙Ⅲ度拥挤,深覆牙合,深覆盖,后牙反牙合。CBCT示:33漂移尖牙倾斜,越过中线,牙尖位于41,42之间。73牙根未见吸收;其他乳牙均已替换(图1,2)。讨论牙齿的跨区漂移(transmigration of canine)是指在无明显病理因素和外伤的情况下,在萌出过程中从牙 Case report Patient, male, 13 years old, Chief Complaint: left lower crest did not fall off, permanent canine did not erupt. Check see: maxillary permanent dentition, mandibular mixed dentition, 33 not adorable, 73 stranded, Ⅱ degree loosening; maxillary anterior teeth Ⅲ degree crowded, deep over-occlusion, deep coverage, posterior teeth anti-occlusion. CBCT shows: 33 drift canine tilt, crossing the midline, cusp lying between 41,42. 73 no absorption of root; other deciduous teeth have been replaced (Figure 1,2). Discussion Tooth transmigration of canine (transmigration of canine) refers to the absence of significant pathological factors and trauma in the case of eruptions from the teeth