title: Color stability of siloranes versus methacrylate-based composites after immersion in staining solutions.
abstract: OBJECTIVE
  The purpose of this study was to determine, by using a spectrophotometer device, the color stability of silorane in comparison with four methacrylate-based composites after being immersed in different staining solutions such as coffee, black tea, red wine, orange juice, and coke, and distilled water as control group.
  
  
  METHODS
  Four restorative methacrylate-based composites (Filtek Z250, TetricEvoCeram, Venus Diamond, and Grandio) and one silorane (FiltekSilorane) of shade A2 were selected to measure their color stability (180 disk samples) after 4 weeks of immersion in six staining solutions: black tea, coffee, red wine, orange juice, coke, and distilled water. The specimen's color was measured each week by means of a spectrophotometer (CIE L*a*b* system). Statistical analysis was carried out performing an ANOVA and LSD Test in order to statistically analyze differences in L*a*b*and ∆E values.
  
  
  RESULTS
  All materials showed significant discoloration (p < 0.05) when compared to the control group (immersed in distilled water). The Highest ∆E observed was with red wine, whereas coke led to the lowest one. Silorane showed the highest color stability compared with methacrylate-based composites.
  
  
  CONCLUSIONS
  Methacrylate-based materials immersed in staining solutions showed lower color stability when compared with silorane. Great differences in ∆E were found among the methacrylate-based materials tested.
  
  
  CONCLUSIONS
  Although color stability of methacrylate-based composites immersed in staining solutions has been widely investigated, this has not been done for long immersion periods with silorane-based composites.
authors.affiliation: Department of Restorative Dentistry and Endodontics, Facultat de Ciències de la Salut, Odontologia, Universitat Internacional de Catalunya, C/Josep Trueta s/n, 08195, Sant Cugat del Vallès, Barcelona, Spain.
authors.forename: Mariana A
authors.initials: MA
authors.lastname: Arocha
authors.forename: Juan R
authors.initials: JR
authors.lastname: Mayoral
authors.forename: Dorien
authors.initials: D
authors.lastname: Lefever
authors.forename: Montserrat
authors.initials: M
authors.lastname: Mercade
authors.forename: Juan
authors.initials: J
authors.lastname: Basilio
authors.forename: Miguel
authors.initials: M
authors.lastname: Roig
mesh_terms: D001628:Beverages; D002253:Carbonated Beverages; D032084:Citrus sinensis / Q000737:chemistry; D003069:Coffee / Q000737:chemistry; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D062047:Silorane Resins / Q000737:chemistry*; D013053:Spectrophotometry; D013499:Surface Properties; D013662:Tea / Q000737:chemistry; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014920:Wine
chemical_list: D003069:Coffee; D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; C444701:Filtek Z250; C509998:Grandio; D008689:Methacrylates; D062047:Silorane Resins; D013662:Tea; C501891:Tetric EvoCeram; C488393:Venus (composite resin); D014867:Water