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 a total-etching versus self-etching adhesive to caries-affected and intact dentin in primary teeth.
BACKGROUND The objec tives of this study were to determine microtensile bond strengths of two dentin adhesives and to compare the micromorphological structure of the resin/dentin interface in caries-affected dentin with that of intact dentin . METHODS The authors r and omly divided 40 proximal dentinal carious primary teeth and 40 noncarious anterior primary teeth into two groups ( self-etching and total-etching ) . They used a caries-detecting dye as an indicator of the need to remove the outer carious dentin . The authors restored the teeth with a hybrid resin-based composite . After 24 hours ' storage in 37 C water , specimens were sectioned and shaped to form a curved section with a cross-sectional area of 1 square millimeter , then tension was applied until they fractured . The authors prepared the resin/dentin interfaces for the two bonding systems and examined them in 10 occlusal carious and 10 noncarious teeth . STATISTICAL ANALYSIS The bond strengths for intact and caries-affected dentin within the same group were analyzed via a t test . The authors compared the remaining dentin thickness ( RDT ) and dentin hardness using analysis of variance and the least significant difference test at the .05 level of significance . RESULTS The self-etching adhesive demonstrated no statistical difference in bond strength between intact and caries-affected dentin . However , the total-etching adhesive demonstrated different bond strengths for intact and caries-affected dentin . Moreover , the RDT of specimens with intact and caries-affected dentin was not significantly different , whereas the dentin hardness of caries-affected dentin was significantly lower than that of intact dentin . The authors found a thicker hybrid layer in intact and caries-affected dentin of specimens in the total-etching group . CONCLUSION The adhesives exhibited significantly different bond strengths in intact dentin of primary teeth . However , they exhibited similar bond strengths in caries-affected dentin
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 .