Shear bond, wettability and AFM evaluations on CO₂ laser-irradiated CAD/CAM ceramic surfaces

The purpose of this study is to determine the CO₂ laser irradiation in comparison with sandblasting (Sb), hydrofluoric acid (Hf) and silane coupling agent (Si) on shear bond strength (SBS), roughness (Rg) and wettability (Wt) of resin cement to CAD/CAM ceramics. Sixty (CAD/CAM) ceramic discs were prepared and distributed into six different groups: group A, control lithium disilicate (Li); group B, control zirconia (Zr); group C, Li: CO₂/HF/Si; group D, Li: HF/Si; group E, Zr: CO₂/Sb/Si; group F, Zr: Sb/Si. Result showed significant difference between irradiated and non-irradiated in terms of shear bond strength for zirconia ceramics (p value = 0.014). Moreover, partial surface wettability for irradiated and non-irradiated ceramics. Irradiated surface demonstrated more rough surface in lithium disilicate than zirconia ceramics. CO₂ irradiation could increase shear bond strength, surface roughness and wettability for both CAD/CAM ceramics.