title: Effect of bleaching on staining susceptibility of resin composite restorative materials.
abstract: BACKGROUND
  Effect of bleaching procedures on staining susceptibility of resin restorative materials is still questionable.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the staining susceptibility of restorative materials bleached with 20% carbamide peroxide home bleaching agent and subsequently immersed in coffee and tea.
  
  
  METHODS
  Forty-two disk-shaped specimens were fabricated for each of the resin composites (Filtek Supreme XT [3M ESPE, St. Paul, MN, USA], Ceram-X Mono [Dentsply, Konstanz, Germany], and Aelite All Purpose Body [BISCO, Inc., Shaumburg, IL, USA]). The baseline color values were measured with a spectrophotometer. The specimens of each restorative material were randomly divided into two groups (N = 21). While the first group specimens were stored in distilled water (nonbleaching group-control), bleaching agent (Opalescence PF 20% [Ultradent Poducts, South Jordan, UT, USA]) was applied on the top surface of each specimen of the second group (bleaching group). After color change values were measured, the specimens were randomly divided into three subgroups (N = 7) according to the staining solutions. The color change values (DeltaE*ab) were calculated and the data were subjected to analysis of variance. Statistical significance was declared if the p value was 0.05 or less.
  
  
  RESULTS
  There was no statistically significant difference within each restorative material's DeltaE*ab values after bleaching (p = 0.714). Also, the staining solutions did not cause a statistically significant difference between DeltaE*ab values of bleaching compared with nonbleaching groups (p = 0.146). Significant interaction was found only between restorative materials and staining solutions (p = 0.000).
  
  
  CONCLUSIONS
  Bleaching of the tested resin composites did not increase their susceptibility to extrinsic staining in vitro. CLINICAL SIGNIFICANCE Bleaching did not affect staining susceptibility of the tested resin composite restorative materials. (J Esthet Restor Dent 21:407-415, 2009).
authors.affiliation: Baskent University, School of Dentistry, Department of Conservative Dentistry, 06490, Bahcelievler, Ankara, Turkey. ccivelek@hotmail.com
authors.forename: Ciğdem
authors.initials: C
authors.lastname: Celik
authors.forename: Bulem
authors.initials: B
authors.lastname: Yüzügüllü
authors.forename: Selim
authors.initials: S
authors.lastname: Erkut
authors.forename: A Rüya
authors.initials: AR
authors.lastname: Yazici
mesh_terms: D000077463:Carbamide Peroxide; D003069:Coffee; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004338:Drug Combinations; D006801:Humans; D008422:Materials Testing; D016877:Oxidants / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry*; D013053:Spectrophotometry; D013499:Surface Properties; D013662:Tea; D013696:Temperature; D013997:Time Factors; D014073:Tooth Bleaching / Q000379:methods*; D014508:Urea / Q000031:analogs & derivatives* / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: C485363:Aelite LS; C520091:CeramX; D003069:Coffee; D003188:Composite Resins; D003764:Dental Materials; D004338:Drug Combinations; C474035:Filtek Supreme; D016877:Oxidants; D010545:Peroxides; D013662:Tea; D014867:Water; D000077463:Carbamide Peroxide; D014508:Urea