The Influence of Iranian Temporary Components on Shear Bond Strength of Composite Resin to Deep Dentin in a Single Bottle Bonding System

There are controversies about the effect of eugenol containing cements on composite-dentin bond strength. This study was designed to evaluate the effect of eugenol containing temporary cements on shear bond strength of composite bonds to deep dentin when using Single Bond. In this in-vitro study, ninety extracted human third molars were sectioned horizontally at deep dentin and randomly divided in six groups after embedded into self cure acrylic material. Samples in five groups were covered with: Cavisol, Temband, and Zoliran with three different powder/liquid ratios of 10/2 gr., 10/3 gr., and 10/2 gr. respectively. The samples in group six were used as control and therefore they received no treatment. After elapse of one week, the temporary cements were removed mechanically from all samples in the first five groups. Only the samples in group five were cleaned by ethanol. All groups were pretreated with single bond and then composite cylinders were added. Debonding and shear bond strength was tested by using DARTEC universal testing machine. These data were analyzed using One-Way ANOVA and Duncan tests. The median shear bond strength were calculated for all six groups as follows: The values were 17.96 (0.73), 15.06 (0.78), 16.14 (0.75), 13.76 (0.66), 16.79 (0.34), 18.12 (36) Mega Paschal respectively. Significant group differences were found for all groups (P<0.001) except for first and sixth (P >0.05) as well as third and fifth groups. Temporary cements containing eugenol significantly reduced the shear bond strength of composite to deep dentin when using Single Bond.