RESULTS No statistical significant difference in bond strength between both categories was observed in caries-affected dentin at immediate evaluation and in sound dentin after ageing .
Etch- and -rinse adhesives , however , performed better in sound enamel and dentin substrates considering immediate bond strength .
None study assessed the long-term adhesive effectiveness to sound or demineralized enamel .
Although the articles included in this meta- analysis showed high heterogeneity and high risk of bias , the in vitro literature suggests superior performance of etch- and -rinse adhesives in primary teeth in comparison with self-etch systems
AIM To systematic ally review the literature for in vitro studies that evaluated the immediate or after ageing bond strength of  etch- and -rinse and self-etch adhesive systems to enamel and dentin of primary teeth .
Effect of sodium hypochlorite on dentin bonding in primary teeth.
PURPOSE The aim of this study was to evaluate the effect of sodium hypochlorite ( NaOCl ) on the shear bond strength ( SBS ) using three bonding systems in primary dentin . MATERIAL S AND METHODS Forty-five sound extracted primary molars were selected . The crowns were longitudinally sectioned , embedded in polystyrene resin , and flattened until a dentin surface was reached . The sample s were assigned to 6 groups ( n = 15 ) : G1 , Single Bond ( SB ) ; G2 , NaOCl + SB ; G3 , Prime & Bond 2.1 ( PB ) ; G4 , NaOCl + PB ; G5 , Clearfil SE Bond ( CSE ) ; G6 , NaOCl + CSE . All the adhesive systems were applied according to the manufacturers ' instructions , except for the application of 10 % NaOCl solution for 60 s in groups 2 , 4 ( after acid etching ) , and 6 ( before applying adhesive system ) . The composite resin was placed in increments in a mold and light cured for 20 s. The sample s were stored in distilled water at 37 degrees C for 24 h and su bmi tted to SBS testing with a crosshead speed of 0.5 mm/min . The failure sites were observed with SEM . The data were treated with ANOVA and Tukey 's tests ( p < 0.05 ) . RESULTS There was no statistically significant difference between the groups with or without treatment of the substrate with NaOCl , regardless the material used . The SBS averages in MPa ( + /-SD ) were : G1 : 15.8(1.9)a ; G2 : 14.6(1.3)a ; G3 : 10.2(0.7)a ; G4 : 9.9(0.2)a ; G5 : 13.3(1.2)a ; and G6 : 10.7(1.0)a . There was a statistically significant difference between the material s ( SB > or = CSE > or = PB ) . Mixed failure was the failure type most frequently observed for all groups . CONCLUSION Dentin surface treatment with NaOCl did not affect the resin-dentin bonding strength in primary teeth
RESULTS No statistical significant difference in bond strength between both categories was observed in caries-affected dentin at immediate evaluation and in sound dentin after ageing .
Etch- and -rinse adhesives , however , performed better in sound enamel and dentin substrates considering immediate bond strength .
None study assessed the long-term adhesive effectiveness to sound or demineralized enamel .
Although the articles included in this meta- analysis showed high heterogeneity and high risk of bias , the in vitro literature suggests superior performance of etch- and -rinse adhesives in primary teeth in comparison with self-etch systems
AIM To systematic ally review the literature for in vitro studies that evaluated the immediate or after ageing bond strength of  etch- and -rinse and self-etch adhesive systems to enamel and dentin of primary teeth .