DOI: 10.36347/sjds.2017.v04i10.004

Pages: 430-433

Sodium hypochlorite is a non-selective proteolytic agent that removes the dentin effectively. This study was performed to evaluate the effect of sodium ascorbate on strength of shear bond of two dentin adhesive systems. Sixty human premolar teeth were selected and the enamel was removed to prepare a dentin cylinder. Then the teeth were randomly divided into six groups; two fifth (Excite) and sixth (Clearfil SE Bond) generations of dentin adhesive systems each one were used in three situations including control, sodium hypochlorite, and hypochlorite and then sodium ascorbate and filled by composite resin and then the strength of shear bond of samples was measured according to megapascal and then the results were analyzed by T, ANOVA, and Tukey-HSD tests. The mean strength was 4.617, 1.280, 5.3810, 10.1090, 3.5560, and 11.5830 megapascals in groups 1, 2, 3, 4, 5, and 6, respectively. The most and the least strength of bonds was related to group 6 (Excite+ Naocl+Ana) and group 2 (Clearfil SE Bond+Naocl), respectively. The strength of bond in group 6 was significantly less than groups 1 (P < 0.001), 2 (P < 0.001), 3 (P=0.002), and 5 (P < 0.001). The strength of bond in group 2 was significantly less than groups 4 (P < 0.0001), and 6 (P < 0.0001).Use of sodium ascorbate after sodium hypochlorite would result in increased strength of composite bond and dentin after use of two dentin adhesive systems of fifth and sixth generations.