Improving adhesion between luting cement and zirconia-based ceramic with an alternative surface treatment

This study evaluated the influence of an alternative surface treatment on the microshear bond strength (μsbs) of zirconia-based ceramic. Thirty-five zirconia disks were assigned to five groups according to the following treatments: Control (CO), glass and silane were not applied to the zirconia surface; G1, air blasted with 100μm glass beads + glaze + silane; G2, a gel containing 15% (by weight) glass beads applied to the ceramic surface + glaze + silane; G3, a gel containing 25% (by weight) glass beads applied to the ceramic surface + glaze + silane; and G4, a gel containing 50% (by weight) glass beads applied to the ceramic surface + glaze + silane. The specimens were built up using RelyX ARC®, according to the manufacturer’s recommendations, and inserted in an elastomeric mold with an inner diameter of 0.8 mm. The μsbs test was performed using a testing machine at a crosshead speed of 0.5 mm/min. ANOVA and Tukey’s test (p < 0.05) were applied to the bond strength values (in MPa). CO (15.6 ± 4.1) showed the lowest μsbs value. There were no statistical differences between the G1 (24.9 ± 7.4), G2 (24.9 ± 2.3), G3 (35.0 ± 10.3) and G4 (35.3 ± 6.0) experimental groups. Those groups submitted to surface treatments with higher concentrations of glass showed a lower frequency of adhesive failures. In conclusion, the glass application improved the interaction between the ceramic and the luting cement.

本研究评估了一种替代性表面处理方案对氧化锆基陶瓷微剪切粘结强度（microshear bond strength，μsbs）的影响。将35个氧化锆圆盘试件按以下表面处理方案分为5组：对照组（CO）：未在氧化锆表面施加玻璃与硅烷偶联剂；G1组：采用100μm玻璃珠喷砂处理+上釉+硅烷偶联剂；G2组：将含15%（质量分数）玻璃珠的凝胶施用于陶瓷表面+上釉+硅烷偶联剂；G3组：将含25%（质量分数）玻璃珠的凝胶施用于陶瓷表面+上釉+硅烷偶联剂；G4组：将含50%（质量分数）玻璃珠的凝胶施用于陶瓷表面+上釉+硅烷偶联剂。试件采用RelyX ARC®粘结剂，遵循制造商的操作指南完成制备，并置入内径为0.8mm的弹性模具中。采用万能试验机以0.5mm/min的十字头速度开展微剪切粘结强度测试。对以MPa为单位的粘结强度值，采用单因素方差分析（ANOVA）与Tukey检验进行统计学分析，检验水准设定为p<0.05。对照组（15.6±4.1）的微剪切粘结强度最低。G1组（24.9±7.4）、G2组（24.9±2.3）、G3组（35.0±10.3）与G4组（35.3±6.0）之间无统计学差异。采用更高浓度玻璃珠进行表面处理的实验组，其粘结破坏的发生频率更低。综上，玻璃基表面处理可有效改善陶瓷与牙科粘结水门汀之间的界面相互作用。