title: A long-term laboratory test on staining susceptibility of esthetic composite resin materials.
abstract: OBJECTIVE
  To evaluate the color stability of composite resin types designed for esthetic anterior restorations when continuously exposed to various staining agents.
  
  
  METHODS
  Thirty-six disk-shaped specimens were made of each of 12 composite materials (1 microfilled and 11 hybrid composites). After dry storage at 37 degrees C for 24 hours in an incubator (INP-500, Memmert), the initial color of each specimen was assessed by a calibrated reflectance spectrophotometer (SpectroShade). Specimens were immersed in five staining solutions or dry stored (control). All specimens were kept in an incubator at 37 degrees C for 99 days. Test solutions were changed every 14th day to avoid bacteria or yeast contamination. After 99 days of storage, spectrophotometric measurements were again performed and L*a*b* scores once more recorded to determine the color changes.
  
  
  RESULTS
  Wine proved to have the highest staining potential followed by coffee, tea, orange juice, and cola, which had the lowest staining potential. The highest color change measured against a white background was observed for Durafill (Heraeus Kulzer) in wine (DeltaE = 62.3), while the least staining was found for Enamel HFO (Micerium) in cola (DeltaE = 3.5). The highest color change measured against a black background was observed for EsthetX (Dentsply) in wine (DeltaE = 46.0), while the least staining was observed for Enamel HFO in cola (DeltaE = 2.5).
  
  
  CONCLUSIONS
  Composite staining susceptibility proved to vary among composite structure and brands. Potential discoloration might be limited by dietary restriction based on such in vitro evaluation.
authors.forename: Stefano
authors.initials: S
authors.lastname: Ardu
authors.forename: Vedrana
authors.initials: V
authors.lastname: Braut
authors.forename: Daniel
authors.initials: D
authors.lastname: Gutemberg
authors.forename: Ivo
authors.initials: I
authors.lastname: Krejci
authors.forename: Didier
authors.initials: D
authors.lastname: Dietschi
authors.forename: Albert J
authors.initials: AJ
authors.lastname: Feilzer
mesh_terms: D001628:Beverages; D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry; D004955:Esthetics, Dental; D008422:Materials Testing; D013053:Spectrophotometry / Q000379:methods; D013499:Surface Properties
chemical_list: D003188:Composite Resins