title: Do adhesive systems influence the color match of resin composites?
abstract: BACKGROUND
  This in vitro study evaluated the influence of adhesive systems on the color match of a resin composite with different translucencies.
  
  
  METHODS
  Sixty disk-shaped specimens were made with A2 and opaque A2 (OA2) shades of nanohybrid resin composite Z250 XT. Specimens of each shade (n = 30) were randomly reassigned to 3 subgroups according to adhesive system: a 2-step etch-and-rinse adhesive (Adper Single Bond Plus), a 2-step self-etch system (Clearfil SE Bond) and a universal adhesive (Scotchbond Universal Adhesive). The bonding agents were applied to resin composite specimens following the manufacturers' recommendations. Additionally, 5 disk samples of each adhesive system were prepared. Colorimetric evaluation (CIE L*a*b* system) was performed immediately after polishing the sample and application of the adhesive systems. Color changes (ΔE and ΔE00) were calculated between 2 measurements. Color coordinates L*, a* and b* of the adhesive disks were also assessed. The data obtained were analyzed using ANOVA and Tukey's post hoc test (α = 0.05).
  
  
  RESULTS
  The application of Scotchbond Universal Adhesive to the resin composite A2 shade resulted in the highest color change (p&lt;0.01; ΔE = 3.1 ± 0.7 and ΔE00 = 1.8 ± 0.4). However, no significant difference was observed among adhesive systems when applied to the resin composite OA2 shade (p&gt;0.05). Scotchbond Universal Adhesive revealed augmented yellowing and greening in comparison with other experimental groups.
  
  
  CONCLUSIONS
  The universal adhesive tested resulted in higher visually perceptible color changes when using a more translucent resin composite shade, but this was clinically acceptable.
authors.affiliation: Graduate Program in Dental Science, Federal University of Santa Maria, Santa Maria - Brazil.
authors.forename: Débora D
authors.initials: DD
authors.lastname: Ritter
authors.affiliation: Department of Stomatology, Federal University of Santa Maria, Santa Maria - Brazil.
authors.forename: Rachel O
authors.initials: RO
authors.lastname: Rocha
authors.affiliation: Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria - Brazil.
authors.forename: Fabio Z M
authors.initials: FZ
authors.lastname: Soares
authors.affiliation: Graduate Program in Dental Science, Federal University of Santa Maria, Santa Maria - Brazil.
authors.forename: Tathiane L
authors.initials: TL
authors.lastname: Lenzi
mesh_terms: D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*
chemical_list: D003188:Composite Resins; D003738:Dental Cements