Shear Bond Strength of Various dental Ceramics Treated with two Techniques of Surface Treatment after Thermocycling

ABSTRACT
Aim: The goal of this work was to compare the shear bond strength of various ceramics bonded to tooth structure following thermocycling using a traditional vs a simplified Surface Treatment approach.
Materials and methods : Thirty removed human mandibular molar teeth were separated into three groups (10 samples each) based on the kind of ceramic material employed (zirconia reinforcing lithium silicate (celtra), Polymer infiltrated glass ceramic (hybrid ceramic) (vita enamic), and lithium disilicate ceramic (vita enamic) (Emax). Each group was divided into two categories based on the surface treatment process (5 samples each) The classic approach (hydrofluoric acid with silane coupling agent) was used in Subgroup I, whereas the simplified method was applied by using Monobond Etch & Prime in Subgroup II. Shear bond strength tests were carried out using universal testing machine. The data was obtained, processed, and statistically analysed.
Results: It was found that a non-significant higher SBS mean values recorded for conventional technique (12.57±0.51 MPa) than simplified technique (11.41±0.36) in Emax group. Regarding Vita Enamic there was significantly higher SBS mean values recorded for the simplified technique (10.83±0.17) using MEP than conventional technique (8.24±0.46) (HF+S). While Celtra duo, revealed significantly higher SBS mean values recorded for conventional technique (11.46±0.51) than simplified technique (7.32±0.75).
Conclusion: Vita Enamic showed better results using Monobond Etch & Prime surface treatment than HF acid and silane. While For Emax and celtra due HF acid and silane has shown better results.
Keywords: Surface treatment, Ceramics, , Shear bond strength, Simplified technique.