title: The effect of home-bleaching application on the color and translucency of five resin composites.
abstract: OBJECTIVE
  The aim of this study was to investigate the effect of home bleaching agents on the color and translucency of resin composites.
  
  
  METHODS
  Thirty disc shaped specimens (1mm thick) were fabricated from each resin composite (Reflexions, Grandio, Gradia Direct, Clearfil Majesty Esthetic, Ceram-X Mono) and divided into 3 subgroups as carbamide peroxide (CP, Opalescence 10% PF), hydrogen peroxide (HP, 10% Opalescence Treswhite Supreme) and control group (n=10). Baseline CIE L*a*b* color coordinates were measured with spectrophotometer and translucency parameters (TP) were calculated. CP and HP groups were treated with bleaching agents according to manufacturers' instructions and control group was stored in distilled water (DW) for 14 days. Color and translucency measurements were repeated and color differences were calculated, ΔE values>3.3 were considered as clinically unacceptable.
  
  
  RESULTS
  Clinically unacceptable color change was detected for all resin composites exposed to bleaching agents and there was significant color difference between the control group and bleached specimens (P<0.05). However no significant color difference was found between CP and HP groups. Intragroup comparison revealed that Ceram-X Mono showed the highest color change but there was no significant difference among the other tested materials for both CP and HP groups. Intergroup comparison of TP values of CP, HP and control groups at the end of 14th day revealed that there was no statistical significant translucency difference among the groups.
  
  
  CONCLUSIONS
  Application of CP and HP resulted in clinically unacceptable color change for all resin composites. Translucencies of the resin composites were not affected by bleaching procedure.
  
  
  CONCLUSIONS
  The results of this in vitro study suggest that patients should be informed regarding a potential color change of existing resin composite restorations with the use of home bleaching agents.
authors: Department of Prosthodontics, Faculty of Dentistry, Near East University, Mersin10, Turkey. Electronic address: sevcankurtulmusyilmaz@gmail.com.
authors: Sevcan
authors: S
authors: Kurtulmus-Yilmaz
authors: Esra
authors: E
authors: Cengiz
authors: Nuran
authors: N
authors: Ulusoy
authors: Sule Tugba
authors: ST
authors: Ozak
authors: Ece
authors: E
authors: Yuksel
mesh_terms: D000077463:Carbamide Peroxide; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry; D063225:Organically Modified Ceramics / Q000737:chemistry; D010545:Peroxides / Q000737:chemistry; D013053:Spectrophotometry / Q000295:instrumentation; D013499:Surface Properties; D013997:Time Factors; D014073:Tooth Bleaching / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000737:chemistry*; D014508:Urea / Q000031:analogs & derivatives / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: C520091:CeramX; D003188:Composite Resins; D003764:Dental Materials; C470230:Gradia; C509998:Grandio; D008689:Methacrylates; D063225:Organically Modified Ceramics; D010545:Peroxides; D058205:Tooth Bleaching Agents; C541508:clearfil majesty; D014867:Water; D000077463:Carbamide Peroxide; C074277:ethoxylated bis-phenol A dimethacrylate; D014508:Urea; D006861:Hydrogen Peroxide
keywords: Bleaching; Carbamide peroxide; Color; Hydrogen peroxide; Resin composite; Translucency