title: [The effect of hydrogen peroxide on the electrochemical corrosion properties and metal ions release of nickel-chromium dental alloys].
abstract: OBJECTIVE
  To investigate the effect of hydrogen peroxide on the electrochemical corrosion and metal ions release of nickel-chromium dental alloys.
  
  
  METHODS
  The corrosion resistance of nickel-chromium dental alloys was compared by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve (PD) methods in artificial saliva after immersed in different concentrations of hydrogen peroxide for 112 h. The metal ions released from nickel-chromium dental alloys to the artificial saliva were detected after electrochemical measurements using inductively coupled plasma mass spectrometry (ICP-MS). The data was statistically analyzed by analysis of variance (ANOVA) using SPSS 13.0 software package.
  
  
  RESULTS
  The electrochemical experiment showed that the sequence of polarization resistance in equivalent circuit (Rct), corrosion potential (Ecorr), pitting breakdown potential (Eb), and the difference between Ecorr and Eb representing the "pseudo-passivation" (δE) of nickel-chromium alloys in artificial saliva was 30% < 10% < 0%(P<0.05). Furthermore, the metal ions including Ni, Cr, and Mo were released from the Ni-Cr alloys to the artificial saliva, and the order of the concentrations of metal ions was 0% < 10%< 30% (P<0.05).
  
  
  CONCLUSIONS
  The corrosion resistance of nickel-chromium dental alloys decrease after immersed in different concentrations of hydrogen peroxide for 112 h. Nickel-chromium dental alloys are more prone to corrosion in the artificial saliva with the concentration of hydrogen peroxide increased, and more metal ions are released in the artificial saliva.
authors.affiliation: Department of Prosthodontics, Shanghai Stomatological Disease Center, Shanghai, China. wangjue1974@sina.com
authors.forename: Jue
authors.initials: J
authors.lastname: Wang
authors.forename: Guang-yan
authors.initials: GY
authors.lastname: Qiao
mesh_terms: D002857:Chromium; D002858:Chromium Alloys; D003343:Corrosion; D003722:Dental Alloys; D006861:Hydrogen Peroxide; D007477:Ions; D009532:Nickel; D012464:Saliva, Artificial; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D007477:Ions; D012464:Saliva, Artificial; D002857:Chromium; D009532:Nickel; D006861:Hydrogen Peroxide