CO2 laser dentin surface treatment most effectively increased ceramic shear bond strength.

ABSTRACT

BACKGROUND AND AIMS: The purpose of this study is to determine the effect of CO2 laser irradiation in comparison with sandblasting (Sb), hydrofluoric acid (Hf) and silane coupling agent (Si) on shear bond strength (SBS) of resin cement to CAD/CAM ceramics bonded to dentin. MATERIAL AND METHODS: Forty-eight (CAD/CAM) ceramic discs were prepared and grouped by material, i.e. lithium disilicate (Emax CAD) and zirconia ceramic (Emax ZirCAD), distributed into four different groups group A, lithium disilicate (Li) CO2/HF/Si; group B, Li HF/Si; group C, zirconia (Zr) CO2/Sb/Si; group D, Zr Sb/Si. RESULTS: It was shown significant difference between irradiated and non-irradiated groups in terms of shear bond strength for zirconia ceramics (p value = 0.039). CONCLUSION: CO2 laser irradiation increases shear bond strength for both CAD/CAM ceramics bonded to dentin.