Objective To compare the resistance to fracture of the root canals after instrumentation or not.

目的比较预备与不预备的根管以及预备后充填与不充填的根管抗折力。

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Objective To compare the resistance to fracture of the root canals after instrumentation or not.

目的比较预备与不预备的根管以及预备后充填与不充填的根管抗折力。

youdao