Shear bond strengths of two luting cements to laboratory-cured prosthetic resin composite

This study evaluated the effect of four types of surface preparations for laboratory-cured prosthetic resin composite on the shear bond strengths of glass ionomer and resin luting cements. Two sizes of light-cured resin composite disks were treated and cemented with two types of luting cements. The specimens were stored in 37 degrees C water for up to 16 weeks before shear mode testing at a crosshead speed of 0.5mm/min in an Instron. The application of dichloromethane and an unfilled bonding resin was an effective surface treatment which improved the shear bond strength of glass ionomer cement to resin composite compared with no-treatment. However, the resin composite, treated with dichloromethane and then coated with bonding resin containing a silane coupler, followed by cementation with resin cement, consistently yielded the strongest shear bond strength with cohesive failures occurring within the resin composite for all specimens.