bond strength of 5(th), 6(th) and 7(th) generation bonding agents to intracanal dentin of primary teeth.

this in-vitro study sought to assess the push-out bond strength of a total etch and 2 self-etch bonding systems to intracanal dentin of primary anterior teeth (pat).thirty-six primary anterior teeth were randomly divided into 3 groups of 5(th) generation (single bond 2), 6(th) generation (clearfil se) and 7(th) generation (single bond universal) bonding agents. the canal orifice was restored with composite resin and the push-out test was carried out to assess the bond strength. after applying the push-out load, specimens were evaluated under a light microscope at 40x magnification. one-way anova and log-rank test on kaplan-meier curves were applied for the comparison of bond strength among the 3 groups.the mean± standard deviation (sd) bond strength was 13.6±5.33 mpa for single bond 2, 13.85±5.86 mpa for clearfil se and 12.28±5.24 mpa for single bond universal. the differences in bond strength among the 3 groups were not statistically significant (p>0.05).all three bonding agents are recommended for use with composite posts in pat. however, due to high technical sensitivity of the total etch system, single or two-step self etch systems may be preferred for uncooperative children.