Abstract
ObjectiveThis study aimed to evaluate the influence of the preheating of flowable composite resins on the color stability when exposed to drinking pigmented beverages. MethodsWave (SDI) and Tetric N-Flow (Ivoclar Vivadent) were used. One hundred and twenty specimens (n=10) were photoactivated at different temperatures (25°C and 68°C). After curing, the specimens were immersed in distilled water for 24h (T0) and then subjected to cola drink, grape juice, and distilled water (control) for 7 days (T1). The color of the specimens was measured using a guide spectrophotometer Easy Shade (Vita Zahnfabrik) at T0 and T1 by means of the parameters of CIE-L*a*b*, and the overall color change after T1 (ΔE) was calculated. The data were analyzed by 3-way ANOVA and Tukey test (P<.05). ResultsPreheated materials showed statistically significant lower color change after immersion in cola drink and grape juice (P<.01). Grape juice produced statistically the greatest color change for both materials tested regardless of the temperature (P<.01). ConclusionThe preheating improved staining resistance of both flowable composites tested. Grape juice showed the highest stainability.
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