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 .
The influence of the cutting speed on bond strength and integrity of microtensile specimens.
OBJECTIVES To verify the influence of cutting speed during microtensile specimen preparation , on bond strength values and on the sample microscopic integrity of a single-bottle adhesive system to enamel and dentin . METHODS Thirty sound human third molars were restored with light-cured Excite and Tetric Ceram according to manufacturers ' instructions , being half in ground enamel [ E ] , and half in flat dentin [ D ] . After 24 h storage in distilled water at 37 degrees C , the restored teeth were sectioned in x and y-axes under different cutting speed : 100 , 200 or 400 RPM , obtaining stick shaped specimens with cross-sectional area of 1.0 mm(2 ) . Five specimens from each experimental group were r and omly selected before being loaded for SEM analysis , while the remaining sample s were subjected to the microtensile bond strength test . Because the variance of dentin specimens was significantly higher than the variance of enamel sample s , analysis of the influence of the cutting speed was performed separately , by substrate . RESULTS The mean values in MPa were calculated including/excluding premature failures : E1 : 24.67/27.31(a ) ; E2 : 24.03/25.81(a ) ; E4 : 19.06/21.52(b ) ; D1 : 35.80/36.33(A ) ; D2 : 35.84/36.65(A ) ; D4 : 37.78/38.50(A ) . In the SEM analysis , better integrity of the dentin specimens was observed when compared to the enamel sample s , for which the integrity was greater in the lower cutting speed groups . SIGNIFICANCE It can be concluded that the cutting speed is an important factor that should be considered , mainly when enamel is involved , since it may affect the bond strength results and the integrity of the specimens
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 .