为此确定了一套最优组合方案：上层磨煤机分离器折向门开度为“6”，省煤器出口氧量为3。
An optimum combination scheme was determined, of which the deflector opening of top mill separator was "6", oxygen content at outlet of economizer 3.
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.
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