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目的：探讨不同形式桩核冠修复体对上颌第二前磨牙折裂模式的影响。方法：选择102例需要进行桩核冠修复的患者，随机分组采用不同形式根管桩系统进行对照比较，观察折裂模式。结果：钴铬合金铸造桩和石英纤维桩在折裂模式之间的差异具有统计学差异，根管桩系统与对照组抗折性能具有统计学差异。结论：为临床合理选择桩核体系提供参考。“,”Objective: To explore the effect of two different kinds of post-core crown on the fracture mode in maxil ary the second premolar. Methods: 102 patients who needed the post-core crown. They were divided into three groups randomly and were checked the fracture mode. Results: There was significant difference in the fracture mode between the two groups with the metal castable post-core and the fiber post-core. And there were significant different in fracture resistance between the post-core groups and control group separately. Conclusions: It’s necessary to make an abutment evaluation and to choose reasonable post-core system before restoration.