Results: compared with control group, the fracture resistance in the experimental groups were lower.

结果：各实验组抗折能力均低于对照组。

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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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Objective To compare the fracture resistance and fracture modes of teeth restored with four diferent post-and-core systems.

比较纤维桩核系统和金属铸造桩核系统修复后牙体组织的抗折裂强度和折裂模式。

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