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目的比较动态负荷下螺钉固位与粘固固位种植单冠修复体的固位与机械力学特性。方法将粘固固位和螺钉固位单冠修复体标本固定在227 kg的压力感受器上，通过计算机控制，在15 kg循环负荷下进行疲劳实验。比较实验前、后单冠修复体的松动度，观察2组标本经受疲劳实验后的失败模式。结果螺钉固位组与粘固固位组单冠平均初始动度值分别为3.62±1.00、3.61±1.31，差异无显著性。螺钉固位组与粘固固位组单冠平均负荷次数分别为(2.16±1.28)M（百万次）、(2.60±2.28)M, 差异无显著性。两组的机械失败方式不同。结论粘固固位和螺钉固位均能为修复体提供足够的固位力。两种固位方式因界面连接不同,导致机械失败的方式也不同。“,”Objective To investigate the stability and mechanical characteristics of screw-retained and cement-retained crowns under dynamic cyclic fatigue testing. Methods screw-retained and cement-retained crown samples were fixed on a 227 kg pressure transducer, through computer control cyclic fatigue testing was performed under a load of 15 kg on the sample during testing. Crown mobility was assessed in PTV value and the failure pattern of crowns were recorded. Results The initial PTV of cement-retained and screw-retained samples were not significant difference. The stability of the two group samples was no significant difference after testing. However the pattern of failure in two group samples was different. Conclusion Both screw-retained and cement-retained methods may provide sufficient retentive force to keep stability of the crown in masticatory function.