Bona AD, et al. - Researchers estimated the color stability and whiteness variations of following bleaching and aging procedures. They fabricated discs (10 mm in diameter and 1 mm thick) of shades A2 and A3 from two RBCs (Filtek Z250 and Filtek Z350 XT) and categorized into 3 subgroups (for each composite and shade) ie, control (no bleaching), at-home bleaching, and in-office bleaching. They observed the color and whiteness differences data considering the 50:50% visual color difference thresholds (perceptibility [PT] and acceptability [AT]) and 50:50% whiteness thresholds [whiteness perceptibility (WPT) and whiteness acceptability (WAT)]. They found that all specimens represented the color difference (ΔE₀₀) and ΔWI_D values below their corresponding acceptability thresholds (AT and WAT, respectively) after bleaching.