title: Color stability of highly filled composite resin materials for facings.
abstract: OBJECTIVE
  The aim of the investigation was to examine the color stability of seven resin-based facing composites with a high content of inorganic filling material (Colombus, Artglass, Sinfony, Targis, Zeta LC, Zeta HC, BelleGlass HP/dentine, BelleGlass HP/enamel).
  
  
  METHODS
  Changes in color of test samples were determined after UV irradiation in a fast-action UV instrument, Sunset CPS+, and after storage in a mouthrinse, tea, coffee, red wine and a 0.1% turmeric (curcuma) solution. Color differences were measured by using a Castor colorimeter and the total amount of color difference represented as DeltaE.
  
  
  RESULTS
  Red wine and the turmeric solution caused the most severe cases of discoloration (DeltaE>10). Tea, coffee, the mouthrinse and UV irradiation caused invisible (DeltaE<1) or visible (DeltaE>1), and to some extent clinically unacceptable (DeltaE>3.3), discoloration.
  
  
  CONCLUSIONS
  It is apparent from the results that it remains essential to improve the color stability of the composite resin materials used for facings.
authors: Dental School, Department of Prosthodontics, Ruprecht-Karls-University, Heidelberg, Germany. thomas_stober@med.uni-heidelberg.de
authors: T
authors: T
authors: Stober
authors: H
authors: H
authors: Gilde
authors: P
authors: P
authors: Lenz
mesh_terms: D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003801:Dental Veneers; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols