Objectives

To compare the shear bond strength of composite-resin cement to nano-structured alumina-coated versus to tribochemical silica-treated zirconia, and to analyze the residual stresses on both of nano-structured alumina-coated versus tribochemical silica-treated zirconia specimens.

Methods

One hundred and eighty zirconia disks (10 mm and 5 mm in diameter, 5 mm thickness) were divided into two groups: nano-structured alumina coating (H.C.Starck, AlN) and tribochemical silica treatment (CoJet) followed by RelyX Ceramic Primer (COJ). For each group, two different sizes of identically pre-treated zirconia specimens were bonded together with RelyX Unicem 2 Cement. A total of 90 specimens were stored in distilled water at 37 °C for 24 h and then further assigned to three groups (n = 15/test group): short-term test, thermocycling for 5000 cycles, and thermocycling for 10,000 cycles. Bond strength was tested in shear mode and results were analyzed using two-way ANOVA, followed by one-way ANOVA and Tukey's HSD (α = 0.05). Failure mode and surfaces were analyzed with optical microscopy and SEM. X-ray diffraction (XRD) were used for t-m phase transformation and residual stress analysis on mechanically pre-treated AlN and COJ surfaces.

Results

The mean bond strengths of AlN and COJ groups were not statistically different after thermocycling (p > 0.05). However, when compare to 24 h only the bond strength of the COJ groups decreased significantly after thermocycling (p < 0.05). Most of specimens in both AlN and COJ groups exhibited adhesive failure. Compressive stresses were detected on both mechanically pre-treated AlN and COJ surfaces, with significant differences in stress values.

Conclusion

Following thermocycling, composite-zirconia bond strength of nano-structured alumina coating was comparable to that of tribochemical silica treatment.

中文翻译：

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与水泥化学摩擦处理的氧化锆相比，复合水泥对氧化铝涂层的剪切粘结强度。

目标

为了比较复合树脂水泥对纳米结构的氧化铝涂层和摩擦化学二氧化硅处理的氧化锆的剪切粘结强度，并分析纳米结构的氧化铝涂层和摩擦化学二氧化硅处理的氧化锆样品上的残余应力。

方法

将一百八十个氧化锆圆盘（直径分别为10毫米和5毫米，厚度5毫米）分为两组：纳米结构氧化铝涂层（HCStarck，AlN）和摩擦化学二氧化硅处理（CoJet），然后进行RelyX陶瓷底漆（COJ） 。对于每组，将两个不同尺寸的经过相同预处理的氧化锆样品与RelyX Unicem 2水泥粘合在一起。将总共​​90个样本在37°C的蒸馏水中保存24小时，然后进一步分为三组（n = 15 /测试组）：短期测试，5000次热循环和10,000次热循环。在剪切模式下测试粘合强度，并使用双向ANOVA，随后的单向ANOVA和Tukey HSD（α= 0.05）分析结果。用光学显微镜和SEM分析失效模式和表面。

结果

热循环后，AlN和COJ组的平均结合强度无统计学差异（p  > 0.05）。但是，与24小时相比，只有COJ基团的结合强度在热循环后显着降低（p <0.05）。AlN和COJ组中的大多数标本均显示出粘合失败。在机械预处理的AlN和COJ表面上均检测到压应力，应力值存在显着差异。

结论

热循环后，纳米结构氧化铝涂层的复合材料-氧化锆粘结强度与摩擦化学二氧化硅处理的强度相当。