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• W1489134479 abstract "The overall aim of this thesis was to examine the kinetics of proton-promoted dissolution ofthe dental hard tissue enamel as a non-bacterial process and the evaluation of inhibitors withthe intent of minimising the dissolution process and effectively protecting the surface.A novel approach was taken, utilising scanning electrochemical microscopy (SECM) togalvanostatically generate controllable and well defined proton fluxes in defined areas of thesurface. The resulting etch pits formed on the surface were characterised by opticalmicroscopy and white light interferometry (WLI), which quantitatively determined etch pitdimensions. A theoretical finite element model (FEM) was used to elucidate the kinetics ofdissolution based upon the analysis of the shape and dimensions of etch pits produced. Aheterogeneous rate constant of dissolution of 0.08 ± 0.04 cm s-1 was attributed to untreatedenamel, whereas 2 min treatment with 1000 ppm sodium fluoride (NaF) decreased this rateconstant slightly to 0.05 ± 0.03 cm s-1. The impact of fluoride on the rate of proton attackwas evident from the formation of shallower broader etch pits.In relation to both acid erosion and caries, the two most relevant acids pertinent to enameldissolution are citric acid and lactic acid. These acids were investigated by protonating theirrespective sodium salts in-situ to produce localised weak acid directly under the probe tip.This permitted the surrounding enamel sample to remain largely unaltered giving a truesurface for comparison, whilst allowing evaluation of the kinetics in the presence of eachweak acid. Etching in the presence of lactic acid, showed a surface controlled process with arate constant of 0.1 ± 0.03 cm s-1. Etching in the presence of the triprotic citric acid, alsoyielded a surface controlled process with a rate constant of 0.35 ± 2.6 cm s-1.Calcite was also investigated using SECM, WLI and FEM to validate the use of thesetechniques. The kinetic data extrapolated was comparable to rate constants found in literature,confirming the validity of these methods. In this case, a novel approach was the use ofexperimental data to parameterise the finite element model directly.Confocal laser scanning microscopy (CLSM) coupled with SECM was used to visualiseproton fluxes from the tip of the UME. This allowed, not only, correlation of the currentapplied to the probe tip with the pH, but also quantitative data on the spread of protons acrossa particular surface. Rate constants found for untreated and fluoride-treated enamel werecomparable to those found in SECM etching, however, zinc ion treatment proved to result inmuch greater inhibition of dissolution than fluoride." @default.
• W1489134479 created "2016-06-24" @default.
• W1489134479 creator A5084469031 @default.
• W1489134479 date "2011-09-01" @default.
• W1489134479 modified "2023-09-24" @default.
• W1489134479 title "Proton assisted dissolution of the dental hard tissue enamel as a non-bacterial process" @default.
• W1489134479 hasPublicationYear "2011" @default.
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