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Materials Research

Print version ISSN 1516-1439

Abstract

SVIZERO, Nádia da Rocha et al. Kinetic of water diffusion and color stability of a resin composite as a function of the curing tip distance. Mat. Res. [online]. 2012, vol.15, n.4, pp.603-610.  Epub July 03, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000070.

The influence of curing tip distance and storage time in the kinetics of water diffusion (water sorption-WSP, solubility-WSB, and net water uptake) and color stability of a composite were evaluated. Composite samples were polymerized at different distances (5, 10, and 15 mm) and compared to a control group (0 mm). After desiccation, the specimens were stored in distilled water to evaluate the water diffusion over a 120-day period. Net water uptake was calculated (sum of WSP and WSB). The color stability after immersion in a grape juice was compared to distilled water. Data were submitted to three-way ANOVA/Tukey's test (α = 5%). The higher distances caused higher net water uptake (p < 0.05). The immersion in the juice caused significantly higher color change as a function of curing tip distance and the time (p < 0.05). The distance of photoactivation and storage time provide the color alteration and increased net water uptake of the resin composite tested.

Keywords : composite resins; polymerization; absorption; solubility; color.

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