Document Type : مقالههای پژوهشی
Authors
1 Postgraduate Student of Prosthodontics, School of Dentistry, Islamic Azad University of Isfahan (Khorasgan), Isfahan, Iran
2 Assistant Professor of Prosthodontics, School of Dentistry, Islamic Azad University (Khorasgan), Isfahan, Iran
Abstract
Introduction: Bonding to zirconia is impossible by conventional methods like other ceramics. This study aimed to investigate three types of surface treatments to increase shear bond strength.
Materials and Methods: In this in-vitro study, 48 zirconia discs were divided into four groups, including a control group and three groups of Hg acid surface preparation by hydrochloric acid, aeration by 50-micron aluminum oxide particles containing silica, and diode laser radiation. Then, each group was divided into two subgroups based on Resin cement (Calibra Universal and Panavia V5). After applying Zprime plus zirconia primer to the samples, they were kept in 37-degree water for a week. Subsequently, their shear bond strength was measured. In the analysis, after controlling the normality of the error distribution using the Shapiro-Wilk test and the homogeneity of the error variance using the Levene test, the two-way ANOVA test, and the post hoc Bonferroni test were used at the five percent error level.
Results: The mean shear bond strength significantly differed among the pretreatment and control groups (p value = 0.004). The cement type has a significant effect on time mean shear bond strength. Among the pretreatment methods, there was no significant difference in mean shear bond strength.
Conclusion: In this study, the most effective surface treatment in Calibra universal samples was air abrasion, and the second was diode laser. In the Panavia V5 group, the first effective treatment was diode laser, and the second was air abrasion. Hot etch samples with both cements had lower strength. In general, it seems that PanaviaV5 cement has better and more reliable results.
Keywords: Zirconia; Shear bond strength; Self-adhesive resin cement; Surface pretreatment