Changes in translucency of light-cured composites after 18 months

Abstract

Objective: Evaluate the changes in translucency of a light-cured composite after 18 months of immersion in distilled water.

Methods: Discs (n=4) measuring 8 mm in diameter and 1.5 mm thick were fabricated (using an ad hoc former) with Brilliant Everglow Body composite (Coltene Whaledent) A1, A2, A3, and  translucent (T). After loading the material, an acetate matrix and pressure was applied  onto of it with a glass slide, afterwards composite was activated with an LED curing unit  (Coltolux LED, Coltene Whaledent) for 20 s. They were stored in distilled water in separate  containers at room temperature. Color measurement was performed after 24 hours (t0)  and after 18 months (t18) using a VITA Easyshade V spectrophotometer (Zahnfabrik Bad  Säckingen, Germany). Two measurements were made per test specimen placed on a  matte white surface and on a matte black background. The CieLab L*, a*, and b* were  recorded for each reading, and arithmetic mean was obtained. Translucency in each case  was calculated using the ΔE formula. Data was analyzed using two-way repeated  measures ANOVA. 

Results: Statistically significant differences were found in translucency between the 24-hour and 18-month measurements (p < 0.01), composite colors (p < 0.01), and the interaction between the two factors (p = 0.017).

Conclusions: Within the framework of this study, it can be stated that all the composites studied showed increased translucency after 18 months.

UBACYT 20720220200020BA