title: Effects of chemical disinfectants on surface characteristics and color of three fixed prosthodontic crown materials.
abstract: BACKGROUND
  Dental restorations should reproduce similar optical effects as natural tooth structure to achieve a good color match. Mismatch can result in unsatisfactory shade matching.
  
  
  OBJECTIVE
  This study determined whether chemical disinfectants affected the surface texture and color of 3 fixed prosthodontic materials.
  
  
  METHODS
  Five chemical disinfectants (Clorox, Banicide, Cidex-7, Biocide, and Multicide) in combination with 3 restorative materials (Dicor, Vita VMK ceramometal porcelain, Midas ADA type III noble casting alloy) were evaluated at 4 different times of immersion (10 minutes, 30 minutes, 24 hours, and 7 days). Changes from baseline for surface roughness and color were evaluated. Surface roughness data were recorded with a surface analyzer and color data in CIE L*a*b* color space were measured with a colorimeter. Data were analyzed with repeated measures analysis of variance and single factor analysis of variance.
  
  
  RESULTS
  There were no statistical differences in surface roughness among disinfectants and restorative materials. However, there were statistical differences of changes in color, increase in deltaE and decrease in deltaL, among disinfectants and the noble casting alloy.
  
  
  CONCLUSIONS
  Only 2 of the 3 materials evaluated, Dicor and Vita VMK ceramometal porcelain, can be used with all 5 disinfectants up to 7 days of immersion. Three chemical disinfectants (Biocide, Clorox, and Multicide) caused clinically significant color changes with the noble casting alloy after 7 days of immersion.
authors.affiliation: University of Washington, School of Dentistry, Seattle, WA 98195, USA. tsunma@u.washington.edu
authors.forename: T
authors.initials: T
authors.lastname: Ma
authors.forename: G H
authors.initials: GH
authors.lastname: Johnson
authors.forename: G E
authors.initials: GE
authors.lastname: Gordon
mesh_terms: D000704:Analysis of Variance; D003116:Color; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D004202:Disinfectants / Q000494:pharmacology*; D006047:Gold Alloys / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003722:Dental Alloys; C047475:Dicor ceramic; D004202:Disinfectants; D006047:Gold Alloys; D003776:Dental Porcelain; C047040:Vita VMK 68