%0 Journal Article
%T Microtensile bond strength of current adhesive systems when compared to cohesive strength of sound dentin and a resin-based composite
%A Cardoso
%A Paulo Eduardo Capel
%A Sadek
%A Fernanda Tranchesi
%A Placido
%A Eliane
%A Santos
%A Jos¨¦ Fortunato Ferreira
%J Materials Research
%D 2004
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%R 10.1590/S1516-14392004000400011
%X purpose: to evaluate the microtensile bond strength (¦Ìtbs) to dentin of 4 adhesive systems, the micromorphology of the adhesive/dentin interface and to compare the results to the ¦Ìts (cohesive strength) of sound dentin and resin composite. occlusal surfaces of 24 extracted caries-free human molars were cut flat to expose the dentin surface. they were randomly assigned to 4 groups (n = 6): adper scotchbond multi purpose plus (mp), adper single bond (sb), clearfil protect bond (cp) and adper prompt (ap). adhesive systems were applied and "crowns" were built using z100. other 5 human molars were sectioned to obtain square-shaped dentin blocks and 5 resin blocks were built using a composite resin, z100. after storage in distilled water at 37 ¡ãc for 24 h, stick-shaped specimens were obtained for all groups (n = 5) with 0.8 mm2 and subjected to ¦Ìtbs or ¦Ìts test. results were analyzed using one-way anova and tukey's test at p < 0.05. the remaining bonded teeth were cut in two halves perpendicularly to the bonded interface and prepared for sem analyses. no significant differences were found among cp (45.6 + 7.4 mpa), sb (43.3 + 6.5 mpa) and mp (35.1 + 5.9 mpa) (p > 0.05). the lowest result was found for ap (27.4 + 4.7 mpa), although not statistically different from mp. most specimens (89.4%) showed predominant adhesive failure. none of the systems tested reached the ¦Ìts values of dentin (108.5 + 9.4 mpa) and z100 (86.5 + 3.6 mpa). bonded interfaces showed lower ¦Ìtbs than those ¦Ìts of dentin and resin composite blocks. the all-in-one self-etching adhesive had the lowest ¦Ìtbs.
%K bond strength
%K cohesive strength
%K resin
%K dentin.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-14392004000400011&lng=en&nrm=iso&tlng=en