Aim of the study: The aim of this study was directed to evaluate the effect of air abrasion, hydrofluoric acid, and combination of air abrasion and hydrofluoric acid on the shear bond strength between dentin and CEREC, VITA VM7, and E-max.
Materials and methods: 90 human lower molars were used. The teeth were divided into three groups (n=30) according to the surface treatment (air abrasion, hydrofluoric acid, and air abrasion + hydrofluoric acid. Each group was then subdivided into three subgroups (n=10) according to the ceramic material (CEREC, E-max, and VITA VM7). Shear bond strength was determined by compressive mode of force applied at ceramic-tooth interface. The collected data were analyzed using two-way analysis of variance (ANOVA) and Tukey's post-hoc test.
Results: The highest mean shear bond strength value was recorded with CEREC group treated by hydrofluoric acid (8.01) while the least mean shear bond strength was recorded with Cerec group but when treated by air abrasion alone, it was (4.33).
Conclusion: Hydrofluoric acid etching for various types of ceramic restoration results in the highest shear bond strength to dentin.