However , for the ultra-mild All-Bond Universal adhesive , the etch- and -rinse strategy was significantly different than the self-etch mode in terms of dentin micro-tensile bond strength , as well as in the global analysis of enamel micro-tensile and micro-shear bond strength ( p≤0.05 ) .
The enamel bond strength of universal adhesives is improved with prior phosphoric acid etching .
However , this effect was not evident for dentin with the use of mild universal adhesives with the etch- and -rinse strategy .
CLINICAL SIGNIFICANCE Selective enamel etching prior to the application of a mild universal adhesive is an advisable strategy for optimizing bonding
OBJECTIVES A systematic review was conducted to determine whether the etch- and -rinse or self-etching mode is the best protocol for dentin and enamel adhesion by universal adhesives .
Effect of phosphoric acid etching prior to self-etching primer application on adhesion of resin composite to enamel and dentin.
PURPOSE To investigate the effect of phosphoric acid etching prior to the application of self-etching primer on the adhesion of resin composite to tooth substrates . MATERIAL S AND METHODS Bovine teeth were r and omly divided in four groups of 20 sample s each . Tooth surface conditions were as follows : Group 1 : enamel ground with 600-grit SiC paper ; Group 2 : ground enamel was etched with 35 % phosphoric acid gel for 15 seconds , water-rinsed and completely dried ; Group 3 : ground dentin ; Group 4 : dentin etched using the same method as Group 2 . The sample s in each group were divided in two subgroups of 10 each . UniFil Bond ( UB ) and Clearfil SE Bond ( SE ) were applied as adhesive systems with self-etching primers , and a layer of resin composite ( AP-X ) was placed and light-cured for 40 seconds . The tensile bond strengths ( TBS ) were measured and the resin-tooth interfaces were observed with scanning electron microscopy . RESULTS The mean TBS values were 11.2 MPa ( Group 1-UB ) , 14.3 MPa ( Group 1-SE ) , 16.3 MPa ( Group 2-UB ) , 20.5 MPa ( Group 2-SE ) , 13.4 MPa ( Group 3-UB ) , 16.7 MPa ( Group 3-SE ) , 9.3 MPa ( Group 4-UB ) and 12.6 MPa ( Group 4-SE ) . Two-way ANOVA and Scheffe 's F test showed that the enamel etching significantly increased the TBS values but dentin etching significantly decreased the TBS values
However , for the ultra-mild All-Bond Universal adhesive , the etch- and -rinse strategy was significantly different than the self-etch mode in terms of dentin micro-tensile bond strength , as well as in the global analysis of enamel micro-tensile and micro-shear bond strength ( p≤0.05 ) .
The enamel bond strength of universal adhesives is improved with prior phosphoric acid etching .
However , this effect was not evident for dentin with the use of mild universal adhesives with the etch- and -rinse strategy .
CLINICAL SIGNIFICANCE Selective enamel etching prior to the application of a mild universal adhesive is an advisable strategy for optimizing bonding
OBJECTIVES A systematic review was conducted to determine whether the etch- and -rinse or self-etching mode is the best protocol for dentin and enamel adhesion by universal adhesives .