Method: Thirty non-carious teeth were selected and sectioned horizontally at the occlusal 1/3 of the clinical crown. The teeth were divided in three groups of ten specimens. Group A was the control group. Composite resin was bonded to the dentin surface using manufacture’s instruction. Group B was treated for ten seconds with 6%sodium hypochlorite, and then composite resin was bonded to the dentin in the same fashion as Group A. Group C was treated for twenty seconds with 6% sodium hypochlorite, and then composite resin was bonded to the dentin in the same fashion as Group A. The specimens were stored in water for twenty-four hours then thermocycled for 1000 cycles at a temperature of 5 degrees C and 60 degrees C. The specimens were shear tested until failure.
Result: There was no statistical difference p greater than 0.05 among Group A, Group B and Group C using a one way ANOVA.
Conclusion: The study showed that there were no clinically significant deficiencies in bond strength when sodium hypochlorite was used prior to etching when using fourth generation bonding agents.
Keywords: Adhesion, Biomaterials, Bleach, Composites and Teeth
See more of: Dental Materials 1: Adhesion - Bond Strength Testing and Mechanisms