Effect of surface treatments and storage methods on the shear bond strength between composite/glass-ionomer cement laminate.

The shear bond strengths between a visible light cure posterior composite and different surface treatments of glass-ionomer Cement were estimated in the dry and wet conditions. A total number of 60 specimens were used in the present investigation. The specimens were divided into 6 equal groups (10 specimens each). Each group was divided into two equal subgroups, in order to study the effect of the storage condition on the shear bond strength for each group. It was found that group (V), where saline coupling agent was applied to the non-etched glass-ionomer cement surface, followed by the application of bonding agent, demonstrated the maximum shear bond strength (10.87 mm/m2). On the other hand, group (II) where composite resin was packed directly on the etched glass-ionomer surface displayed the minimum shear bond (1.93 Mn/M2). Moreover, the wet storage of the different groups elicited a varying percentage of reduction in the shear bond strength values.