Dentine bond of light-activated glass-ionomer liner/bases

This in vitro study comparatively assessed the magnitude and durability of the bonds to dentine of three glass-ionomer liner/bases, BaseLine VLC, Vitrebond and XR Ionomer. Shear bond strengths to human dentine were measured after 24 h. storage in water at 37 degrees C and after 5,000 continuous thermocycles between 5 degrees C and 55 degrees C. The BaseLine VLC material failed to achieve any measurable bond. The mean bond strength values of Vitrebond after 24 h. storage in water at 37 degrees C and after thermocycling were significantly higher (p < 0.05) than those of XR Ionomer. Both Vitrebond and XR Ionomer exhibited a drop in their bond strengths after thermocycling but this was statistically significant only in the case of XR Ionomer. These findings indicate that Vitrebond exhibits a more reliable bond to dentine compared to those of BaseLine VLC and XR Ionomer.