Efeito do polimento no comportamento óptico de resina composta monocromática submetida ao manchamento artificial: estudo piloto

Abstract

This in vitro experimental study evaluated the chromatic behavior of polychromatic (Filtek™ Z350 XT) and monochromatic (Palfique Omnichroma) composite resins, as well as a repairing association (Z350 repaired with Omnichroma), after artificial staining with coffee and subsequent repolishing. Specimens (n=10/group) were immersed in coffee for 7 days, with color readings (ΔE00 - CIEDE2000) performed at times T0 (initial), T1 (after staining) and T2 (after repolishing). The data were analyzed by mixed ANOVA for repeated measures (α=0.05). Coffee staining promoted significant chromatic changes in all groups (ΔE00 > 1.8), with Filtek™ Z350 XT standing out (24.97 ± 1.93). Repolishing significantly reduced pigmentation (p<0.001), however, no material recovered its initial color. Omnichroma showed the greatest residual alteration (15.75 ± 3.63) after repolishing, differing significantly from Filtek™ Z350 XT (7.96 ± 1.02) and the repaired group (7.37 ± 1.11). It is concluded that coffee causes significant staining in all materials, and repolishing is effective as a conservative strategy for aesthetic maintenance, although its color recovery capacity is material-dependent, being more limited for monochromatic resin.