title: Color stability of different composite resin materials.
abstract: BACKGROUND
  Data are needed to better predict the color stability of current composite resin materials.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the impact of different storage solutions on the color stability of different composite resin materials.
  
  
  METHODS
  Different restorative and adhesive composite resin specimens (dual-polymerizing self-adhesive resin cement, autopolymerizing resin-based composite resin, dual-polymerizing resin-based composite resin, nanohybrid composite resin, and microhybrid composite resin) were fabricated and stored in red wine, black tea, chlorhexidine, sodium fluoride, tea tree oil, or distilled water for 4 weeks at 37°C. Color parameters were measured with a colorimeter before and after storage. Total color differences and specific coordinate differences were expressed as ΔE, ΔL, Δa, and Δb. A 2-way and 1-way analysis of variance (ANOVA) with Bonferroni adjustment for multiple comparisons were applied for statistical calculations (α=.05).
  
  
  RESULTS
  Red wine caused the most severe discoloration (ΔE >10), followed by black tea with perceptible (ΔE >2.6) to clinically unacceptable discoloration (ΔE >5.5). Colored mouth rinses discolored the materials to a lesser extent with clinically acceptable values. Dual-polymerizing resin adhesives showed a higher amount of discoloration.
  
  
  CONCLUSIONS
  Current restorative and adhesive composite resin materials discolor over time under the influence of different storage solutions. The composition related to the polymerizing mode seemed to be a causative factor.
authors.affiliation: Department of Orthodontics, Bernhard Gottlieb University Clinic of Dentistry, Medical University of Vienna, Austria. frank.falkensammer@meduniwien.ac.at
authors.forename: Frank
authors.initials: F
authors.lastname: Falkensammer
authors.forename: Gerwin Vincent
authors.initials: GV
authors.lastname: Arnetzl
authors.forename: Angelika
authors.initials: A
authors.lastname: Wildburger
authors.forename: Josef
authors.initials: J
authors.lastname: Freudenthaler
mesh_terms: D003116:Color; D003188:Composite Resins / Q000737:chemistry; D008422:Materials Testing; D053761:Nanocomposites; D010938:Plant Oils; D058105:Polymerization; D017797:Prosthesis Coloring; D012969:Sodium Fluoride; D013053:Spectrophotometry; D013662:Tea; D014920:Wine
chemical_list: D003188:Composite Resins; D010938:Plant Oils; D013662:Tea; D012969:Sodium Fluoride