结论：使用改进的固定矫正器进行牙根牙合向牵引治疗前牙冠根折的方法有效可行。
Conclusion: Tooth extrusion method with new method is an effective method for anterior teeth with crown-root fracture.
目的：观察用改进的固定矫治器进行牙根牙合向牵引治疗前牙冠根折的临床疗效。
Objective To observe clinical efficacy of crown lengthening surgery for the treatment of crown-root-fractured teeth, subgingival fractured edge.
应用推荐