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Title: Interaction of environmental calcium/phosphate and pH with glass ionomer restoratives
Keywords: Glass Ionomer, Calcium and Phosphate, pH
Issue Date: 22-Jan-2007
Citation: WANG XIAOYAN (2007-01-22). Interaction of environmental calcium/phosphate and pH with glass ionomer restoratives. ScholarBank@NUS Repository.
Abstract: This study investigated the interaction of environmental calcium/phosphate and pH with glass ionomer restoratives. It was found that the effects of environmental calcium/phosphate on both calcium and strontium based HVGICs were pH dependent. When pH were at 7 and 5, variations in environmental calcium/phosphate levels did not significantly affect the hardness, elastic modulus and surface structure. However, at pH 3, hardness and modulus of these GICs were increased by the addition of environmental phosphate. Environmental phosphate also improved wear resistance and shear strength of HVGICs exposed to acidic conditions. The improved properties were strongly correlated to a modified surface layer arising from the interaction between environmental phosphate and GICs. The structure, compositions and mechanical properties of the surface reaction layer varied depending on environmental phosphate levels. The findings of the current study suggest that the introduction of local phosphate to GICs may result in better clinical performance of glass-ionomer restoratives in vivo.
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