[Effect of different surface zirconium oxide treatments on binding strength between zirconia and veneering ceramics]

To compare the effect of three different surface zirconium oxide treatments on binding strength and fracture patterns between zirconia and veneering ceramics. Methods: A total of 40 zirconia specimens and 10 nickel-chromium alloy were divided into 5 groups (n=10 in each group): a treatment group by zirconium oxide sand-blaste (Group A), a zirconia bonded porcelain group (Group B), a hot-etching solution group (Group C), a non-treatment zirconia (Group D) and a non-treatment nickel-chromium alloy group (Group E). After all treatments, a veneering porcelain (4 mm×4 mm×2 mm) was formed onto the center of all substrate specimens by plastic coating method. Shear bond strength (SBS) test with a universal testing machine was used in each group. Scanning electron microscopy was used to observe the surface morphology of the damaged specimen interface, which was randomly selected from each group. Results: The SBS test showed that there was no significant difference in SBS results between the Group A, the Group B and the Group D (both P0.05), and both of them were significant less than that in the group E (both P0.05). The SBS results in the Group C were significantly higher than that in the Group D, the Group A, and the Group B (all P0.05), but there were no significant difference compared with that in the Group E (P0.05). Conclusion: Sand-blaste and liner application on zirconia ceramic contribute no effect to binding strength between zirconia and veneering ceramics, but hot-etching solution can increase the binding strength between zirconia and veneering ceramics.目的：探讨不同方式处理对氧化锆陶瓷与饰瓷结合强度的影响。方法：制作40个氧化锆瓷块、10个镍铬合金片，并按照表面处理方法分为5组，即喷砂组(A组)、结合瓷组(B组)、热酸蚀组(C组)、氧化锆空白对照组(D组)、镍铬烤瓷对照组(E组)。5组试件处理完成后，采用粉浆涂塑法烧结大小为4 mm×4 mm×2 mm的饰瓷。通过万能试验机对所有试件进行剪切强度测试，每组随机抽取一个样本在电子显微镜下进行界面破坏形貌分析。结果：剪切强度结果显示：与D组相比，A组和B组剪切强度差异均无统计学意义(均P0.05)，且二者均显著小于E组(均P0.05)；C组剪切强度值显著高于D组、A组和B组(均P0.05)，但与E组相比差异无统计学意义(P0.05)。结论：喷砂及烧结的结合瓷层对于增强锆瓷与饰瓷的结合强度无显著作用，热酸蚀可以显著增强锆瓷与饰瓷的结合强度。.