Objective: to observe the effects of different root canal file and the restoration of occlusal surface on the fracture resistance of premolars.
目的：观察不同根管锉预备根管及不同面充填物对前磨牙牙体抗折强度的影响。
Objective: To compare the clinical effects after root canal preparation with hand use stainless steel file, nickel titanium alloy engine file and root canal ultrasonic file.
目的：比较手用不锈钢锉，镍钛合金机用锉和超声根管锉在根管预备后的临床效果。
File fracture was a frequent complication of root canal therapy.
根管 治疗的常见并发症之一。
Root canal preparation with nickel titanium alloy engine file.
镍钛合金机用锉根管预备。
Conclusion the combined application of sonic and hand file instrumentation was conduced to improve the effect of root canal preparation.
结论声波器械和手用器械的联合应用，有助于提高根管预备的效果。
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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