Effect of mucin on the corrosion behaviour of dental casting alloys.
The influence of mucin on the corrosion behaviour of seven typical dental casting alloys was investigated. A commercial saliva substitute (Saliva Orthana) containing mucin, and a control from which the mucin had been removed, were used. The electrochemical behaviour of the test alloys was evaluated around the open circuit potential (OCP) utilizing standard potentiodynamic techniques, as a function of oxygen concentrations and pH. The results of the corrosion measurements were analysed by a four-way ANOVA to detect the influence of alloy, environment and possible interactions. Mucin seems to act as a cathodic inhibitor at pH 6.7 but not at pH 4.6. An unidentified component (e.g. benzoate) of the saliva substitute probably acts as an adsorption inhibitor. Anodic passivation is also correlated with the artificial saliva composition.
Mezger
P R
PR
Department of Occlusal Reconstruction, University of Nijmegen, The Netherlands.
van't Hof
M A
MA
Vrijhoef
M A
MA
Gravenmade
E J
EJ
Greener
E H
EH
D000704:Analysis of Variance; D003343:Corrosion; D003722:Dental Alloys; D004553:Electric Conductivity; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D009077:Mucins / Q000502:physiology*; D010100:Oxygen; D012464:Saliva, Artificial
D003722:Dental Alloys; D009077:Mucins; D012464:Saliva, Artificial; D010100:Oxygen