Evaluation of alumino-silicate ceramic surface after different surface conditioning methods

Purpose: of this paper was to evaluate changes in alumino-silicate glass ceramic surface structure and the bond strength to composite material after different surface conditioning methods. Design/methodology/approach: Different conditioning methods of ceramic surface were applied: sandblasting, etching with hydrofluoric acid or both. Grounded ceramic surface served as control group. To evaluate changes of ceramic surface structure CLSM microscopy was used and profilometric analysis of ceramic surface was performed. Shear bond strength of composite material to ceramics was tested. Findings: The highest bond strength between tested alumino-silicate ceramics and composite material was obtained after sandblasting followed by 5 min 9% HF. Research limitations/implications: Further research should be conducted to evaluate the influence of surface treatment methods e.g. prolonged hydrofluoric etching time, on mechanical properties of ceramics. Practical implications: Extending HF etching time of glass-ceramic surface results in increased surface area and allows to obtain high bond strength to composite material. Originality/value: Results of the study applies to clinical situation as the clinical outcome and survival rate of dental all-ceramic prosthetic restorations depend on reliable bonding to tooth structures.

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