Vertebra fractured vertebra; Front to rear operation; United.
颈椎骨折脱位；前后路手术；联合。
AIM: to raise the living rate of pulp after review of the permanent-front-teeth with root-fractured beneath the middle and improve the quality of root-tube-treatment to the dead pulp teeth.
目的：提高牙根中部以下根折恒前牙复位后牙髓的存活率和死髓后根管治疗术的质量。
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