This study evaluated the influence of occlusal resin cement space on the fatigue performance of bonded-leucite crowns to a dentin-analogue material. Leucite anatomical crowns were adhesively cemented to dentin-like preparations having distinct occlusal cement space (50, 100 and 300 μm) (n = 18), and subjected to step-stress fatigue testing (150 N – 350 N; step-size: 25 N; 20,000 cycles/step; 20 Hz). Fatigue data (load and number of cycles for failure) were analyzed using Kaplan–Meier and Mantel–Cox (log-rank) tests (p <0.05). Fractographic analysis and occlusal internal space measurements were also performed. There was no significant difference for the distinct occlusal cement layer (50 μm: 289 N, 136,111 cycles; 100 μm: 285 N, 132,778 cycles; 300 μm: 246 N, 101,667 cycles). Occlusal internal space analysis showed a mean thickness of 120.4 (50 μm), 174.9 (100 μm) and 337.2 (300 μm). All failures were radial cracks originating at the ceramic-cement interface. Distinct occlusal cement spaces had no effect on the fatigue behavior of anatomical leucite crowns.

这项研究评估了咬合树脂胶粘剂空间对粘结白云石牙冠对牙本质类似材料的疲劳性能的影响。将白云石解剖冠粘结到具有明显牙合水泥间隙（50、100和300μm）（n = 18）的牙本质样制剂上，并进行阶梯应力疲劳试验（150 N – 350 N；阶梯尺寸：25） N； 20,000个周期/步； 20 Hz）。使用Kaplan–Meier和Mantel–Cox（log-rank）测试分析了疲劳数据（载荷和故障循环次数）（p <0.05）。分形分析和咬合内部空间测量也进行了。独特的咬合水泥层没有显着差异（50μm：289 N，136,111周期； 100μm：285 N，132,778周期； 300μm：246 N，101,667周期）。咬合内部空间分析显示平均厚度为120。4（50μm），174.9（100μm）和337.2（300μm）。所有故障都是源自陶瓷-水泥界面的径向裂纹。不同的咬合水泥空间对解剖白云石冠的疲劳行为没有影响。