The effect of ceramic surface treatments on the shear bond strength of dental composite resin to all-ceramic coping materials

The purpose of this Study was to evaluate the shear bond strength of composite resin to 4 different all-ceramic coping materials with 3 different surface treatments after thermocycling and without thermocycling. Three different surface treatments - sandblasting with 50 mu m alumina particles (AB); sandblasting with 50 mu m alumina particles and acid etching with 4% hydroflouric acid (AE); sandblasting with 50 mu m alumina particles and 30 mu m alumina particles with tribochemical silica coating (SI) and silane application - were used on four different all-ceramic; Feldspatic ceramic (Duceram Plus); Lithium disilicate ceramic (IPS Empress2)-, Alumica ceramic (In-Ceram Alumina); Zirconia ceramic (Zi-Ceram) - substrates. Shear bond strength of restorative composite resin to Substrate was tested after thermocycling and without thermocycling (n = 10). Each specimen was subjected to a shear load at a crosshead speed of 2 mm/min until fracture. Two-way analysis of variance and Duncan multiple comparison test (alpha = 0,05) were used to analyze the bond strength values. There were significant differences in the bond strengths for ceramic types (P < .001), Surface treatments (P < .001), and thermocycling (P < .001). The Duncan analysis showed that the Si specimens had significantly higher bonding strengths than other specimens. The bond strength of composite resin decreased after thermocycling.