ObjectivesThis study aimed to evaluate the effect of different light-curing units on the immediate post-polymerization color change of one-shade and multi-shade composite resins.Material and MethodsEight composite resins, comprising 4 universal one-shade (Omnichroma, Charisma Diamond One, Essentia Universal, and Vittra APS Unique) and 4 multi-shade composite resins (Estelite Sigma Quick, Gænial Universal Injectable, Optishade Universal, and Filtek Ultimate) were evaluated. Standardized specimens were prepared using 8 mm-diameter, 2 mm-thickness Teflon molds (n = 10). Baseline color measurements were obtained with a contact-type spectrophotometer (Vita Easyshade Compact) before polymerization. Then the specimens were polymerized using 4 different light-curing units (Elipar S10, VALO Cordless, Woodpecker LED.E, and Woodpecker iLed), and second color measurements were performed. Color differences were calculated using the CIEDE2000 formula. Data were analyzed using a two-way ANOVA and post hoc Tukey tests, with α = 0.05.ResultsStatistically significant differences in color change were observed among the tested composite resins and light-curing units (P ≤ 0.05). The ΔE00 values ranged from 3.75 to 13.93. The most significant color change was detected in the Omnichroma group polymerized with the Woodpecker iLed unit (ΔE00 = 13.93). In contrast, Estelite Sigma Quick demonstrated the lowest color change when cured with the VALO Cordless (ΔE00 = 3.75).ConclusionWithin the limitations of this study, both the type of composite resin and the light-curing units significantly influenced post-polymerization color change. Therefore, shade selection should be performed after polymerization, and the same light-curing unit should be used for polymerization to achieve optimal aesthetic outcomes in clinical practice.
Göçer et al. (Tue,) studied this question.