EVALUATION OF THE EFFECT OF THE ETCH AND RINSE DHESIVES WITH DIFFERENT SOLVENTS ON DURABILITY OF ESIN COMPOSITE BONDING TO THE TREATED DENTIN WITH PROANTHOCYANIDINS

Use of the antioxidants can affect the durability of bond strength in some
adhesive systems. This study sought to evaluate the effect of two types of the two step etch and rinse
adhesive systems with different solvents on durability of resin composite bonding to the treated
dentin with proanthocyanidins.
Materials & Methods: In this in vitro experimental study, 80 human molar teeth, after removal of
the coronal enamel, were randomly divided into 4 groups, based on the type of solvent used in the
adhesive. Half of them were treated with proanthocyanidins, and others were considered as the
control. Thermocycling and cutting were done on the specimens 24 hours after preparing and water
storage. Half of them were immediately subjected to the microtensile bond strength test, and the
others after 6 months storage in distilled water. The mode of failures and the fractured surface
morphology were examind under a stereomicroscope and scanning electron microscope,
respectively.
Results: None of the variables including the use of proanthocyanidin, type of solvent and storage
had significant effect lonely, but the interaction between the use of proanthocyanidin and solvent
type, and the interaction between the use of proanthocyanidin and storage had statistically significant
effect on the values of microtensile bond strenght (P<0.05).
Conclusion: Use of proanthocyanidin leads to bond stability and this effect improves significantly
accompanying adhesives with ethanolic base