Kinetic of water diffusion and color stability of a resin composite as a function of the curing tip distance

• Main Authors: Nádia da Rocha Svizero, Roberta Caroline Bruschi Alonso, Linda Wang, Regina Guenka Palma-Dibb, Maria Teresa Atta, Paulo Henrique Perlatti D'Alpino
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2012-08-01
• Series: Materials Research
• Subjects: composite resins; polymerization; absorption; solubility; color
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000400019

The influence of curing tip distance and storage time in the kinetics of water diffusion (water sorption-W SP, solubility-W SB, 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 (&#945; = 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.