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The Mechanism for Erosion of Glass-ionomer Cements in Organic-Acid Buffer Solutions

Second Department of Conservative Dentistry, Faculty of Dentistry 61, Kyusyu University, Fukuoka 812, Japan

S. Matsuya

Department of Dental Materials Engineering, Faculty of Dentistry 61, Kyusyu University, Fukuoka 812, Japan

M. Yamane

Department of Dental Materials Engineering, Faculty of Dentistry 61, Kyusyu University, Fukuoka 812, Japan

The behavior and mechanism for erosion of glass-ionomer cements in organic-acid buffer solutions were studied as a function of time, pH, and citric-acid concentration. In acidic solutions, the dissolution of the cement was controlled by the diffusion of the eluted species in the cement matrix, which depended on H⁺ ion concentration. In citric-acid solutions, the dissolution of the cement was controlled by both the diffusion and the surface reaction between the acid anion and the eluted species. Contribution of the latter reaction was larger with the increase in the acid concentration.

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Journal of Dental Research, Vol. 69, No. 5, 1175-1179 (1990)
DOI: 10.1177/00220345900690051001


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