方法：72例外伤冠折露髓患牙，采用活髓切断术切断冠部牙髓，保留根髓活力，促进牙根发育。
Methods: 72 teeth with exposed pulps in crown treated by pulpotomy to conserve the vital pulps and promote the growth of roots of teeth.
方法：72例外伤冠折露髓患牙，采用活髓切断术切断冠部牙髓，保留根髓活力，促进牙根发育。
Methods: 72 teeth with exposed pulps in crown treated by pulpotomy to conserve the vital pulps and promote the growth of roots of teeth.
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