Methods the clinical experiment included 120 cases of mandibular premolars treated with root canal therapy, with 60 patients separately in control (K file) group and experimental (TF) group.
方法临床实验120例下颌双尖牙根管治疗病例，对照组(K锉)和实验组(TF)各60例。
Methods the clinical experiment included 120 cases of mandibular premolars treated with root canal therapy, with 60 patients separately in control (K file) group and experimental (TF) group.
方法临床实验120例下颌双尖牙根管治疗病例，对照组(K锉)和实验组(TF)各60例。
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