Department of Prosthodontics, Faculty of Dentistry, Aydın Adnan Menderes University, Aydın, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Nuh Naci Yazgan University, Kayseri, Turkey.
J Prosthodont. 2023 Jun;32(5):411-416. doi: 10.1111/jopr.13563. Epub 2022 Jul 15.
To assess the fracture resistance of monolithic zirconia crowns cemented with different types of cement on cement-retained implant abutments.
Forty implant analogs were positioned in acrylic resin blocks, and cement-retained straight implant abutments were fastened to the analogs. Crowns were designed with/without occlusal vent holes and produced from monolithic zirconia blocks by the CAD-CAM technique. The two crown types were divided into two groups and cemented with resin and zinc-polycarboxylate cement under 5 kg weight. A universal testing machine applied compressive forces to the crowns until fracture. Fracture resistance values were analyzed using two-way ANOVA and the independent samples t-test with statistical significance set at p < 0.05.
According to the two-way ANOVA results, although the crown design did not have a significant effect on fracture resistance (1417.65 ± 337.39 N, 1565.16 ± 517.12 N; crowns with and without vent holes, respectively), the main effect of the cement variable on the fracture resistance was significant. Zinc-polycarboxylate cement (1680.1 ± 375.23 N) showed higher fracture resistance than resin cement (1302.71 ± 420.64 N) in the crowns designed with vent holes (p < 0.005).
The use of cement-retained implant-supported monolithic zirconia crowns with an occlusal vent hole is safe, and zinc-polycarboxylate cement use may be an appropriate choice for cementation of these crowns.
评估不同类型的粘结剂粘结于固位基台的整体氧化锆冠的抗折裂性能。
将 40 个种植体模拟体置于丙烯酸树脂块中，并将粘结基台直体固定在模拟体上。通过 CAD-CAM 技术从整体氧化锆块中设计并制作带/不带咬合通气孔的冠。将两种冠类型分为两组，分别用树脂和锌聚羧酸酯粘结剂在 5kg 重量下粘结。万能试验机对冠施加压缩力直至发生断裂。使用双向方差分析和独立样本 t 检验分析抗折裂值，以 p < 0.05 为具有统计学意义。
根据双向方差分析结果，尽管冠设计对抗折裂性没有显著影响（分别为 1417.65 ± 337.39N 和 1565.16 ± 517.12N），但粘结剂变量对抗折裂性的主要影响具有统计学意义。在带通气孔的冠中，锌聚羧酸酯粘结剂（1680.1 ± 375.23N）的抗折裂性高于树脂粘结剂（1302.71 ± 420.64N）（p < 0.005）。
使用带咬合通气孔的粘结固位基台的整体氧化锆冠是安全的，而锌聚羧酸酯粘结剂的使用可能是粘结这些冠的合适选择。
