Influence of Adhesive Systems on Bond Strength of Restorative Material

Aim: To assess the influence of two adhesive systems on the bond strength of the restorative material to enamel and dentin after bleaching. Materials and method: 60 non-carious extracted premolar teeth after bleaching with 40% Hydrogen peroxide were divided into four groups based on type of adhesive system used and the tooth surface i.e. enamel and dentin used for bonding. G1ET and G3DT were restored using total etch adhesive system whereas G2ES and G4DS with self etch adhesive system. Similarly 60 teeth were used as control group which were not bleached and restored using the different adhesive systems. The samples were subsequently submitted to shear bond strength test in a Universal machine and the fracture patterns were assessed under a stereoscopic microscope. Results: All the bleached groups showed decrease in mean shear bond strength. Enamel showed greater bond strength on using total etch adhesive system. Bleached dentin showed significantly higher bond strength when self etched. Conclusion: Shear bond strength of composite to enamel and dentin decreases after bleaching treatment. Self-etching adhesive and Total-etching adhesive should be the first choice when performing restoration of teeth involving dentin and enamel respectively after bleaching.