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 acid etching time on the degradation of resin-dentin bonds in primary teeth.
PURPOSE To investigate the influence of etching time on the degradation of resin-dentin bonds produced in primary teeth . METHODS 40 primary molars were r and omly divided into four groups according to the adhesive system , Single Bond ( SB ) and Clearfil SE Bond ( CSEB ) , and acid etching time . SB was applied to dentin after phosphoric acid etching for 15 or 7 seconds , whereas CSEB was applied after the application of SE Primer for 20 or 10 seconds . Resin composite crowns were built-up followed by the production of specimens with a cross-sectional area of 0.49 mm2 , which were further divided according to the storage condition , 24 hours , 6 and 12 months in water . Data were su bmi tted to ANOVA and Tukey tests ( alpha=0.05 ) . RESULTS After 24 hours there was no significant difference between bond strengths produced by the adhesive systems , irrespective of the acid etching time . Water storage for 6 and 12 months significantly reduced bond strengths of SB , especially when the dentin was acid etched for 15 seconds . For CSEB , no significant alteration in bond strength was seen up to the storage period of 12 months for both etching times
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 .