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 .
Comparison of intra- and intertooth resin-dentin bond strength variability.
PURPOSE The aim of this study was to investigate the intra- and intertooth microtensile bond strength variability of two adhesive systems applied to dentin . MATERIAL S AND METHODS Twenty human third molars were ground to expose a flat dentin surface . Two adhesive systems ( Single Bond and One Step ) were applied according to the manufacturers ' instructions and composite resin crowns were constructed incrementally . After 24 h in distilled water at 37 degrees C , each tooth was longitudinally sectioned in both " x " and " y " directions under 300 rpm to obtain sticks with a cross-sectional area of 0.8 mm2 . The sticks from each tooth were tested at a crosshead speed of 0.5 mm/min . The fracture pattern of each stick was microscopically analyzed after debonding ( 400X ) . A mixed model with adhesive as a fixed variable , tooth as a r and om variable , and bonded area included as a covariate , was employed for the data treatment . In this model , all observations have the same variance , which is the sum of two components : the variance of the r and om effect ( intertooth ) and the variance of the errors ( intratooth ) . RESULTS The intratooth variability was greater than the intertooth variability . CONCLUSION The intratooth variability is higher than the intertooth variability . Sticks from the same tooth can not be considered as an experimental unit , since it does not fulfill all ANOVA requirements
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 .