title: Effect of one-step polishing system on the color stability of nanocomposites.
abstract: OBJECTIVE
  This study was to compare the effect of three different one-step polishing systems on the color stability of three different types of nanocomposites after immersion in coffee for one day and seven days and determine which nanocomposite material has the best color stability following polishing with each of the one-step polishing system.
  
  
  METHODS
  The nanocomposites tested were Tetric EvoCeram, Grandio and Herculite Précis. A total of 120 discs (40/nanocomposite, 8mm×2mm) were fabricated. Ten specimens for each nanocomposite cured under Mylar strips served as the control. The other specimens were polished with OptraPol, OneGloss and Occlubrush immersed in coffee (Nescafé) up to seven days. Color measurements were made with a spectrophotometer at baseline and after one and seven days. Two way repeated measure ANOVA, two way ANOVA and Bonferroni tests were used for statistical analyses (P<0.05).
  
  
  RESULTS
  The immersion time was a significant factor in the discoloration of the nanocomposites. The effect of three one-step polishing systems on the color stability was also significant. The color change values of the materials cured against Mylar strips were the greatest. The lowest mean color change values were from the Occlubrush polished groups. The effect of the three different types of nanocomposite on the color change was significant. The highest color change values were with Tetric EvoCeram groups. The lowest color change values were with Herculite Précis groups.
  
  
  CONCLUSIONS
  The color change of nanocomposite resins is affected by the type of composite, polishing procedure and the period of immersion in the staining agent.
authors.affiliation: Department of Conservative Dentistry, Faculty of Dentistry, University of Malaya, 50603 Kuala Lumpur, Malaysia. sellawjali@yahoo.co.uk.
authors.forename: S S
authors.initials: SS
authors.lastname: Alawjali
authors.forename: J L
authors.initials: JL
authors.lastname: Lui
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D003069:Coffee; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods*; D045782:Hemiterpenes / Q000737:chemistry; D006801:Humans; D007101:Immersion; D007840:Latex / Q000737:chemistry; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013053:Spectrophotometry / Q000295:instrumentation; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D017554:Carbon Compounds, Inorganic; D003069:Coffee; D003188:Composite Resins; D003764:Dental Materials; C509998:Grandio; D045782:Hemiterpenes; D007840:Latex; D011109:Polymethacrylic Acids; D011145:Polyvinyls; D017655:Silicon Compounds; D012833:Siloxanes; C501891:Tetric EvoCeram; C505364:caoutchouc; C034183:vinyl polysiloxane; C020946:triethylene glycol dimethacrylate; C009495:titanium dioxide; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D014025:Titanium; D000537:Aluminum Oxide; C022088:silicon carbide
keywords: Color stability; Nanocomposite resin; Polishing