title: A SEM evaluation of a 6% hydrogen peroxide tooth whitening gel on dental materials in vitro.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effects of a novel 6% hydrogen peroxide gel on the surface morphology of dental gold, amalgam, porcelain and composite.
  
  
  METHODS
  Admixed high-copper amalgam and hybrid resin composite specimens were prepared in extracted teeth using standard clinical procedures. Feldspathic porcelain and type III gold specimens were prepared in a mould using standard laboratory procedures. One half of the specimens were covered with nail varnish to serve as the control side, leaving the other half exposed. The specimens were treated with pooled whole saliva (1 h), followed by the peroxide gel (20 min), rinsing with water and returning to saliva. This cycling protocol was continued until a total of 28 treatments with the peroxide gel were completed. The samples were prepared for SEM.
  
  
  RESULTS
  There were no observable differences at 200x and 2000x magnifications between the control and peroxide gel treated sides on any of the materials tested.
  
  
  CONCLUSIONS
  There were no significant effects of the 6% hydrogen peroxide gel on the surface morphology of any of the dental materials tested.
authors.affiliation: Indiana University School of Dentistry, Oral Health Research Institute, Indianapolis, Indiana 46202, USA. bschemeh@iupui.edu
authors.forename: Bruce
authors.initials: B
authors.lastname: Schemehorn
authors.forename: Carlos
authors.initials: C
authors.lastname: González-Cabezas
authors.forename: Andrew
authors.initials: A
authors.lastname: Joiner
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D005782:Gels; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016877:Oxidants / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry; D012463:Saliva / Q000737:chemistry; D013499:Surface Properties; D014073:Tooth Bleaching
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D003764:Dental Materials; D005782:Gels; D006047:Gold Alloys; D016877:Oxidants; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar; D003300:Copper; D003723:Dental Amalgam; D006861:Hydrogen Peroxide