Effect of surface treatments on shear bond strength of resin composite bonded to CAD/CAM resin-ceramic hybrid materials

Abstract

PURPOSE. The purpose of this study was to assess the effect of surface treatments on shear bond strength of resincomposite bonded to thermocycled and non-thermocycled CAD/CAM resin-ceramic hybrid materials. MATERIALS AND METHODS. 120 specimens (10×10×2 mm) from each material were divided into 12 groupsaccording to different surface treatments in combination with thermal aging procedures. Surface treatmentmethods were airborne-particle abrasion (abraded with 50 micron alumina particles), dry grinding (grinded with125 μm grain size bur), and hydrofluoric acid (9%) and silane application. According to the thermocyclingprocedure, the groups were assigned as non-thermocycled, thermocycled after packing composites, andthermocycled before packing composites. The average surface roughness of the non-thermocycled specimenswere measured after surface treatments. After packing composites and thermocycling procedures, shear bondstrength (SBS) of the specimens were tested. The results of surface roughness were statistically analyzed by 2-wayAnalysis of Variance (ANOVA), and SBS results were statistically analyzed by 3-way ANOVA. RESULTS. Surfaceroughness of GC were significantly lower than that of LU and VE (P