Color stability and fluorescence of different orthodontic esthetic archwires

<jats:title>Abstract</jats:title><jats:sec><jats:title>Objective:</jats:title><jats:p>To evaluate the color stability of six esthetic archwires at different time periods and their fluorescence.</jats:p></jats:sec><jats:sec><jats:title>Materials and Methods:</jats:title><jats:p>Samples were evaluated after 7, 14, and 21 days of immersion in staining solution. Color measurements were performed by means of a spectrophotometer according to the Commission Internationale de I'Eclairage L*a*b* system, and color changes (ΔE*) and National Bureau of Standards units were computed. The fluorescence of as-received samples was evaluated by two observers and compared with that of a bovine central incisor. Statistical differences were investigated using analysis of variance and Tukey's post hoc test.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>All brands showed statistically significant color change after 21 days (ΔE* from 1.88 to 12.06). The Optis archwire (fiber-reinforced composite) presented the highest color alteration, although staining was observed only near its ends. The Trianeiro archwire (coated nickel-titanium) and the Ortho Organizers archwire (coated stainless steel) presented with less color change. The Optis archwire was the only one that presented with fluorescence similar to that of bovine teeth.</jats:p></jats:sec><jats:sec><jats:title>Conclusions:</jats:title><jats:p>All esthetic archwires assessed showed clinically noticeable color change after 21 days in staining solution. The optical properties of currently available esthetic archwires may not yet be ideal.</jats:p></jats:sec>