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 .
Microtensile bond strength of different adhesive systems to primary and permanent dentin.
PURPOSE The aims of this in vitro study were to : ( 1 ) compare bond strength of different adhesive systems to primary and permanent dentin using microtensile test ; and ( 2 ) evaluate the interaction of these material s to primary and permanent dentin by means of scanning electron microscopy ( SEM ) . METHODS Middle-coronal dentin surfaces of 18 exfoliated primary and 18 extracted permanent molars were exposed and teeth were r and omly divided , according to their adhesive system , into 3 groups ( N=6 per group ) : ( 1 ) Clearfil SE Bond ( SE ) ; ( 2 ) One Up Bond F ( OU ) ; and ( 3 ) Single Bond ( SB ) . Then , 5-mm high composite blocks were constructed . After bonding procedures , the teeth were stored in distilled water at 37 degrees C for 24 hours prior to the specimens ' preparation . For the microtensile test , teeth ( N=5 per group ) were longitudinally sectioned into 2 axes rendering beam-specimens that were glued to special devices , which were mounted in a Universal Testing Machine to be loaded under a crosshead speed of 1 mm/min until fracture . One tooth of each group was prepared for SEM . RESULTS Microtensile bond strength mean values ( MPa ) to primary /permanent dentin were : ( 1 ) SE=60.0/61.4 ; ( 2 ) OU=54.5/53.3 ; and ( 3 ) SB=70.1/64.9 . Two-way analysis of variance ( ANOVA ) showed no significant differences ( P>.05 ) for the bond strength values among primary and permanent dentin groups , neither among groups SExSB and SExOU . SEM images of SE and SB showed a well-defined , uniform , and continuous hybrid layer . A continuous hybrid layer , however , was not found for OU . CONCLUSIONS Bond strength and micromorphologic characteristics of the adhesive systems evaluated were not influenced by the substrate . OU achieved worse results
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 .