Abstract

Success of all-ceramic dental restorations depends on the cohesive strength of the strong ceramic core, the esthetic veneer and the bonding of their interface. Shear bond strength and failure modes of commercially available all-ceramics systems (IPS e.max Ceram/Press and IPS e.max Ceram/Katana) with adhesively luted experimental ceramic was investigated in the study. The maximum principal stresses (MPS) in finite element analysis and the amplitude intensities during acoustic emission analysis (AE) were further correlated with their failure modes during shear bond test. Shear bond strength between the core-veneer specimens were tested with a universal testing machine at a cross-head speed of 1 mm/min with acoustic emission sensors to investigate fracture mode. Three dimensional geometric models were built to simulate shear bond test. Kruskal Wallis and Mann Whitney post hoc test were used to compare the shear bond strength and AE amplitudes between the groups. Median and interquartile ranges of shear bond strength in glass-ceramic systems were 26 MPa (10.74) and in zirconia, was 22 MPa (8.5) respectively. Cohesive core fractures in glass-ceramics and mixed mode/adhesive fractures were observed in zirconia and experimental ceramic. MPS values in glass-ceramic and zirconia groups were comparable. Statistically significant differences between initial, final fracture loads and AE amplitudes were seen within the ceramic groups. Fracture modes in glass-ceramic core-veneers suggest a strong core-veneer bonding than in zirconia. Finite element and acoustic emission analysis can be explored to predict the failure modes of bi-layered ceramics.

摘要

全瓷牙修复的成功取决于坚固的陶瓷芯的内聚强度、美观的饰面及其界面的结合。研究中研究了市售全陶瓷系统（IPS e.max Ceram/Press 和 IPS e.max Ceram/Katana）与粘合实验陶瓷的剪切粘合强度和失效模式。有限元分析中的最大主应力 (MPS) 和声发射分析 (AE) 中的振幅强度与它们在剪切粘合试验中的失效模式进一步相关。使用万能试验机以 1 mm/min 的十字头速度和声发射传感器对芯板试样之间的剪切粘合强度进行测试，以研究断裂模式。建立三维几何模型来模拟剪切粘合试验。Kruskal Wallis 和 Mann Whitney 事后检验用于比较各组之间的剪切粘合强度和 AE 幅度。玻璃-陶瓷系统中剪切粘合强度的中位数和四分位数范围分别为 26 MPa (10.74) 和氧化锆，分别为 22 MPa (8.5)。在氧化锆和实验陶瓷中观察到了玻璃陶瓷中的内聚芯断裂和混合模式/粘附断裂。玻璃陶瓷和氧化锆组的 MPS 值具有可比性。在陶瓷组内观察到初始、最终断裂载荷和 AE 幅度之间的统计学显着差异。与氧化锆相比，玻璃陶瓷芯板的断裂模式表明芯板结合力更强。可以探索有限元和声发射分析来预测双层陶瓷的失效模式。