Color stability of light-cured composites

Abstract

Objective: To evaluate the color stability of 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 was applied, and pressure with a glass slide was also applied on top. The 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) with a VITA Easyshade V spectrophotometer (Zahnfabrik Bad Säckingen, Germany). Two determinations were made with the specimen placed on a matte white surface per test tube, and the CieLab L*, a*, and b* values were recorded for each. For the values for each factor the arithmetic mean of both readings was considered. Data were analyzed using t test and two-way repeated measures ANOVA.

Results: The ΔE (mean (sd)) for each color were: A1: 4.65 (1.48), A2: 2.71 (0.87), A3: 3.47 (0.99), T: 4.59 (0.98). No significant differences (p=0.08) were found between the different colors. Statistically significant differences were found in the a* and b* components (p<0,01)

Conclusions: Within the framework of this study, it can be stated that all the composites studied presented a statistically significant and clinically relevant color change.

UBACYT 20720220200020BA