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Vickers hardness (means with 95% confidence interval) as a function of RBC and bulk-fill category: (a) light-cured, low-viscosity bulk-fill RBCs; (b) light-cured, high-viscosity bulk-fill RBCs; and (c) dual-cured bulk-fill RBCs. Letters indicate homogeneous groups within each material category; Tukey’s post-hoc test (α = 0.05).
