PubMed · 7848754
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D Halestrap. 1995-01-21. Amalgam.. https://doi.org/10.1038/sj.bdj.4808651
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Motivated by the observed influence of stainless steel and ferric and ferrous ions on the behavior of the peroxidase/oxidase oscillator, the mechanism and kinetics of interaction of 1,4-dihydronicotinamide adenine dinucleotide (NADH) with iron ions in 0.1 M acetic acid/sodium acetate buffer with pH 5.1 and with the solution/stainless steel interface were extensively studied. The character of a possible mutual influence of NADH/acetate buffer solution and Type 316 stainless steel has been investigated. We also suggest the mechanism of stainless steel corrosion inhibition by NADH. It was determined that fast complexation of ferric and ferrous ions with NADH occurred with rate constant kcompl = 4.0 x 10(9) +/- 0.2 x 10(9) M-1 s-1. The composition of the product complex is [Fe-(NADH)2] for both Fe2+ and Fe3+. A previously unreported complex of ferrous ion and NADH was discovered, determined, and separately investigated. Kinetic and equilibrium constants for reactions of iron ions-NADH complexation and following redox processes of the complex decomposition were determined from spectrophotometric and electrochemical experiments.
The electrochemical corrosion behaviour of 16 currently marketed amalgams for dental fillings was studied in vitro. Depending upon the type of amalgam and the treatment of the filling the electrochemical corrosion currents derived from cyclic voltammograms varied over several orders of magnitude. Their change as a function of time was also very different. Suggestions are made for a stability rating of the products based on the results obtained.
The first metal-on-metal artificial hip joints of the sixties (for example that of Mckee, Norwich) were soon replaced by models with polyethylene acetabular cups because of several shortcomings. 20 years later, however, a few patients were seen where such metal-to-metal joints still performed very well. Closer investigations revealed that with improved machining and a more perfect fit the failures of the first series could be eliminated and that these models were much less prone to wear than the ones using polyethylene. The author has developed and inserted such new prostheses, with good success so far.