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。
Objective To compare the resistance to fracture of the root canals after instrumentation or not.
具有超早强，超高强，无收缩，抗折强度高，粘结力强等特点。
The grouting material have Ultra-early-strength, ultra high strength, no shrinkage, high flexural strength, strong adhesion and so on.
具有超早强，超高强，无收缩，抗折强度高，粘结力强等特点。
The grouting material have Ultra-early-strength, ultra high strength, no shrinkage, high flexural strength, strong adhesion and so on.
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