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 .
Shear bond strength of different adhesive systems to primary dentin and enamel.
The aims of this study were to evaluate the shear bond strength ( SBS ) off our adhesive systenms applied to primary dentin and enamel and verify , after SBS testing , the failure mode of the adhesive interface . Sixty extracted sound primary molars were selected and crowns were sectioned in a mesial-distal direction . Specimens were r and omly assigned into two groups ( adhesion to enamel and adhesion to dentin ) and then subdivided into four subgroups according to the adhesive system ( n=15 ) . Scotchbond Multi- Purpose (SMP)--Single Bond (SB)--Clearfil SE Bond ( and Adper Prompt L-Pop (APL)--SBS tests were performed and the obtained values were statistically analyzed using ANOVA and Tukey tests ( p < 0.05 ) . The failure mode analysis was performed with a Scanning Electron Microscope ( XL-30 , Philips ) . SBS mean values on enamel were [ MPa ( SD ) ] : SMP--2789 ( 749 ) ; SB--23.92 ( 8.8 ) ; CSB--24.36 ( 6.69 ) , APL--25.96 ( 4.08 ) ; and on dentin : SMP--17.29 ( 4.25 ) SB--18.2 ( 8.74 ) ; CSB--16.13 ( 714 ) ; APL--6 . 04 ( 3.35 ) . The predominant failure mode was cohesive ( primarily of the bonding agent ) . On enamel SBS was statistically similar for all four adhesives . On dentin SBS ofAPL was lower than the other tested adhesives
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 .