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 observe the effects of different root canal file and the restoration of occlusal surface on the fracture resistance of premolars.
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。
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.
自然频率分析法的结果显示，不同制造方式的镍钛合金根管锉，在经过使用后会 有不同幅度的下降以及长度的增加量，因此可以将这种检测方式应用在临床上。
These results demonstrate that the RF analysis tests have potential as a tool for structural detection in Ni-Ti instruments and that the method presented is feasible for clinical application.
自然频率分析法的结果显示，不同制造方式的镍钛合金根管锉，在经过使用后会 有不同幅度的下降以及长度的增加量，因此可以将这种检测方式应用在临床上。
These results demonstrate that the RF analysis tests have potential as a tool for structural detection in Ni-Ti instruments and that the method presented is feasible for clinical application.
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