ObjectiveThe oral environment is subject to biofilm accumulation and cariogenic challenge,
and few studies exist on the effect of these factors on the bond strength of
adhesive systems. The aim of this study was to test if the exposure of adhesive
interfaces to cariogenic challenge under biofilm accumulation could promote higher
degradation than the exposure to biofilm accumulation alone. Material And MethodsFive molars were ground until exposure of medium dentin and then restored (Single
Bond 2 and Z250 3M ESPE). The tooth/resin sets were cut to obtain beam-shaped
specimens, which were distributed according to the aging conditions (n=20): water
for 24 h (control); biofilm under cariogenic challenge for 3, 5 or 10 days;
biofilm without cariogenic challenge for 10 days; and water for 3 months.
Microcosm biofilms were formed from human saliva and grown in a saliva analogue
medium, supplemented or not with sucrose to promote cariogenic challenge.
Specimens were tested for microtensile bond strength, and failure modes were
classified using light microscopy. Bond strength data were analyzed using ANOVA
and failure modes were analyzed using ANOVA on ranks (α=0.05). ResultsNo significant differences in bond strength were detected among the aging methods
(P=0.248). The aging period was associated with an increase in the frequency of
adhesive failures for the groups aged for 10 days or longer (P<0.001). ConclusionAging leads to a higher prevalence of interfacial adhesive failures, although this
effect is not associated with cariogenic challenge or reduction in bond
strengths.
(b) Private Practice, Pelotas, RS, Brazil.Effect of filling technique on the bond strength of methacrylate and silorane-based composite restorations Abstract: The bond strength of methacrylate (Z350, 3M ESPE) and silorane (P90, 3M ESPE) restorations, using different cavity filling techniques, was investigated. Cavities (6 × 3 × 3) in bovine teeth were filled using bulk, oblique, or horizontal increments. A pushout test was carried out after 24 h. Data were statistically analyzed (α = 5%). Methacrylate-based composites and the horizontal filling technique showed the highest bond strength values (10.2 ± 3.9, p < 0.05). Silorane-based composites showed no statistically significant differences regarding the filling techniques (p > 0.05).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.