Effect of Light-Curing Distances on the Color and Translucency of Resin Composites After Accelerated Aging

Polymerization plays an important role in the color and translucency of resin composite materials. The aim of this study was to evaluate the effect of light-curing distances of resin composites on color change (Delta E00) and translucency change (Delta TP) after accelerated aging (AA). Four resin composites (G-Aenial Anterior, Charisma Smart, GrandioSO, and Admira Fusion) were used. The resin composites were cured from 0 mm, 2 mm, and 4 mm distances. A spectrophotometer was used to determine the color measurements and calculate the color change and translucency using the CIEDE2000 formula. The resin composites were submitted to AA for 300 h. Two-way analysis of variance and multiple comparisons Tukey's test were used (p < 0.05). Delta E00 at 0 mm and 2 mm distance was similar, but higher was found at 4 mm distance. The highest and lowest Delta E00 were observed in the G-Aenial Anterior and Charisma Smart respectively. But no differences were observed between Charisma Smart and Admira Fusion. Translucency changes at 2 mm and 4 mm distances were similar, but lower translucency changes were observed at a distance of 0 mm. The translucency change values of the materials were found to be similar after accelerated aging. Increasing the light-curing distance can lead to deterioration of color stability and a tendency to decrease translucency. Clinicians should position the light-curing device as close to the material as possible.