Influence of surface treatment and simulated aging on the shear bond strength of different luting agents to zirconia.

BACKGROUND

Zirconia, or stabilized zirconium oxide (ZrO2), is a widely used dental ceramic for full-coverage crowns owing to its favorable biological and esthetic properties. Upon cooling after high-temperature sintering, zirconia undergoes a tetragonal-to-monoclinic phase transformation, which causes volume expansion and brittleness. Adhesive cementation (AC) is crucial for the clinical performance of zirconia restorations, enhancing their retention, marginal adaptation and fracture resistance, thereby contributing to their suitability for dental restorations.

OBJECTIVES

The aim of the present study was to evaluate how different kinds of surface treatment affect the shear bond strength (SBS) of zirconia, to analyze the influence of various luting agents on the SBS of zirconia, and to investigate the effect of simulated aging through water storage on the SBS of zirconia.

MATERIAL AND

METHODS

An experimental study design was used to assess the impact of 2 luting agents (RelyX™ Unicem and Panavia™ F 2.0), different surface treatment methods (STMs) and variable water-storage durations (1day (1D), 1 month (1M) and 6 months (6M)) on the SBS of zirconia.

RESULTS

The study revealed that RelyX consistently showed lower mean SBS values than Panavia across the different water-storage durations. For instance, in group 1 at 1D, the mean SBS for RelyX was 17.12 ±0.71 MPa as compared to 21.76 ±2.81 MPa for Panavia. ANOVA indicated significant differences in SBS between RelyX and Panavia in each group (group 1: F = 13.892; p < 0.000). Post-hoc tests confirmed significant differences in the mean SBS across the different aging durations. Overall, the findings provide comprehensive statistical evidence regarding the performance of the 2 dental luting agents under different surface treatment and aging conditions.

CONCLUSIONS

RelyX consistently demonstrated lower mean SBS values than Panavia across the different water-storage durations, indicating differences in their bonding performance. Statistical analyses confirmed significant differences in SBS between the 2 luting agents.