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。
The anatomical distribution of cortical and cancellous bone in the femoral neck may be critical in determining resistance to fracture .
股骨颈中皮质骨和松质骨的解剖分布情况决定了其抗骨折的能力。
PURPOSE: To study the effect of ion-exchange treatment on the fracture resistance of hot pressable ceramic crown.
目的：研究国产陶瓷表面离子交换处理对热压铸瓷冠抗碎裂载荷的影响。
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