Abstract
Objectives To evaluate the effect of different artificial aging methods on the bond strength
of a resin composite associated with a universal adhesive (Scotchbond Universal) used
under two etching approaches (self-etch [SE] or etch-and-rinse [ER]) to enamel and
dentin substrates.
Materials and Methods A total of 96 noncarious human third molars were prepared and randomly divided according
to three factors (n = 6): substrate (enamel and dentin), adhesive approach (SE and ER), and aging method
(water storage for 24 hours, 6 months, or 1 year; subjected to 10,000, 20,000, or
30,000 thermal cycles; and sodium hypochlorite [NaOCl] storage for 1 or 5 hours).
Statistical Analysis Microshear bond strength tests were conducted, and the collected data (MPa) were
subjected to three-way analysis of variance (ANOVA) with post hoc Bonferroni tests
(p < 0.05) and Weibull analysis. The failure pattern was also evaluated.
Results Three-way ANOVA revealed that the factors “substrate” (p = 0.00) and “aging method” (p = 0.00) had a significant effect on the bond strength, but the factor “adhesive approach”
did not (p = 0.84). The bond strength in the enamel group for the SE approach was negatively
affected under 20,000 and 30,000 thermal cycles. Weibull presented the highest m in the NaOCl storage for the 5 hours group to enamel using the SE and to dentin using
ER approaches. Adhesive/mixed failures were predominant for all groups.
Conclusion Thermocycling aging (20,000 and 30,000 cycles) significantly reduced the bond strength
to enamel using the SE approach. On the contrary, storage with the NaOCl method proved
to increase bond strength under the evaluated conditions.
Keywords
artificial aging - interface degradation - hydrolysis - universal adhesive
