目的：定量研究弯曲根管预备过程中根管的偏移。

AIM: To evaluate root canal deviation during instrumentation of curved root canals.

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目的：评价HERO 642镍钛锉预备磨牙弯曲根管的临床疗效。

Objective: To evaluate the effect of HERO642 nickel-Titanium files in preparation of curved root canals.

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目的：评价用平衡力法预备弯曲根管的临床疗效。

AIM: To evaluate the clinical effect of balanced force technique in preparation of curved root canals.

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