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 self-etching and total-etch adhesive systems to Er:YAG laser-irradiated primary dentin.
PURPOSE The purpose of this study was to assess in vitro the shear bond strength of self-etching and total-etch adhesive systems to Er : YAG laser-irradiated primary dentin . METHODS Forty crowns of primary canines were embedded in acrylic resin and mechanically ground to expose a flat dentin surface . The specimens were r and omly assigned to 2 groups ( N=20 ) , according to the adhesive system : ( A ) Single Bond ( SB ) ; and ( B ) Adper Prompt ( AP ) . Each group was divided into 2 subgroups ( N=10 ) , depending on the surface treatment : ( 1 ) conventional bonding protocol , as recommended by the manufacturers ; and ( 2 ) irradiation of the dentin site with a 2.94-microm wavelength Er : YAG laser , with a 300-mJ pulse energy and a 2-Hz repetition rate followed by the bonding protocol . In both groups , a 3-mm diameter dentin bonding site was demarcated , the adhesive systems were applied , and resin composite cylinders were bonded . After 24 hours in distilled water , shear bond strength was tested at a crosshead speed of 0.5 mm/minute . RESULTS Means ( in MPa ) were : group A1=14.14(+/-1.7 ) ; group A2=8.41(+/-1.04 ) ; group B1=6.88(+/-1.12 ) ; and group B2=4.19(+/-0.7 ) . Data were su bmi tted to statistical analysis using 2-way analysis of variance and t test at 5 % significance level . CONCLUSION Irradiation of primary dentin with the Er : YAG laser decreased the bond strength of total-etch and self-etching adhesive systems
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 .