ARTIFICIAL ACCELERATED AGING EFFECTS ON THE COLOR AND GLOSS STABILITY OF MODERN UNIVERSAL RESIN COMPOSITES: AN IN-VITRO STUDY

Abstract

ABSTRACT: Background: Progression in filler technology has given rise to the introduction of modern universal resin composites, which simplify shade selection; however, their performances after artificial accelerated aging are yet to be examined and verified. Objectives: To evaluate and compare the color and gloss stability of different modern universal composites submitted to different periods of artificial accelerated aging. Materials and Methods: Forty disc-shaped composite specimens were fabricated, cured and polished then divided into four groups (n=10): (G1; Omnichroma, G2; Filtek Universal Restorative, G3; TPH Spectra ST, G4; Filtek Z350 XT). Color and gloss were measured before and after exposing to weathering device for (100, 200, 300 hours). The color change (ΔE*) was assessed with a spectrophotometer. The surface gloss was calculated using a glossmeter. Results were statistically analyzed using repeated measures ANOVA test followed by Bonferroni’s post-hoc test (P ≤ 0.05). Results: ΔE* was observed to be a positive linear function of log time. ΔE* was maximal in the sequence; Filtek Z350 XT = TPH Spectra ST > Omnichroma > Filtek Universal Restorative. ΔE* remained < 3.3 for Filtek Universal Restorative and Omnichroma. Gloss was observed to be a negative linear function of log time. Gloss was maximal in the sequence; Omnichroma > Filtek Universal Restorative > Filtek Z350 XT > TPH Spectra ST. Conclusions: Omnichroma and Filtek Universal Restorative demonstrated superior performance in color and gloss stability compared to TPH Spectra ST and Filtek Z350 XT.