Objectives: To evaluate the color, translucency and masking ability of a newly developed bulk-fill resin composite with enhanced opacity. Materials and Methods: A3 shade composite discs (n=20/material) (Filtek bulk-fill; FB and Filtek bulk-fill One; FBOne) were prepared at 2 and 4 mm thickness (n=10/thickness). Three different backgrounds (white tile, black tile, and C4 shade porcelain) and the intrinsic color for each material were used to determine the translucency parameter (between white and black backgrounds), and to simulate oral cavity darkness (between the black background and the intrinsic color of resin composite), and the discolored tooth structure (between C4 shade porcelain and the intrinsic color of resin composite). Additionally, the chroma coordinates were measured for 2 mm thickness on the different backgrounds. Data were analyzed by Mann-Whitney U test, and Wilcoxon test as a post hoc for multiple comparisons (p< .05). Results: A clinically perceptible color difference (Δ E* > 1.74) was recorded between FB and FBOne. FBOne showed significantly higher TP values (p< .001) than FB. None of the two materials could mask the oral cavity darkness in a clinically acceptable threshold (ΔE* > 2.7). FBOne showed a clinically acceptable (2 mm, ΔE* < 2.7) and un-perceptible threshold (4 mm, ΔE* < 1.74) for masking the discolored tooth substrate. Conclusions: FBOne is a promising bulk-fill resin composite showing an appropriate masking ability of the discolored tooth structure without interfering with its translucency
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