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Evolution of the color variation ΔE for each material over the course of the study when immersed in acidic drink (Coca-Cola, The Coca-Cola Company, Milano, Italy) for 1 day + immersion in coffee. Spectrophotometric analysis was made immediately after light-polymerization (T0) and at 7 (T1), 14 (T2), 21 (T3), 28 (T4) days.
