De Maeyer E A, Verbeeck R M, Vercruysse C W
Department of Dental Materials Science, Dental School, Institute for Biomedical Technologies (IBITECH), University of Ghent, Belgium.
J Dent Res. 1998 Dec;77(12):2005-11. doi: 10.1177/00220345980770120901.
The glass component critically determines the properties of glass-ionomer cements (GIC). However, the exact relationship between the composition of the glass and these properties is not yet fully understood. To investigate this relationship, we studied the reactivity of glasses used in commercial GIC in acetic acid solutions, using a pH-stat method. Qualitative differences in the leaching behavior of these glasses can be explained by different pre-treatments. Acid-washing and silanization modify the surfaces of the glass particles, thus inducing a delay of the leaching process, whereas untreated glasses exhibit a fast initial leaching, but their acid reactivity slows very soon. Quantitative differences in acid reactivity can be correlated with the mean chemical composition of the glasses. In this respect, the leaching tends to increase with an increasing ratio of network-dwelling cations to Al3+ ions. These results provide a fundamental basis for the explanation, prediction, and control of cement properties as a function of glass characteristics.
玻璃成分对玻璃离子水门汀（GIC）的性能起着关键决定作用。然而，玻璃组成与这些性能之间的确切关系尚未完全明晰。为探究这种关系，我们采用pH计法研究了市售GIC中所用玻璃在醋酸溶液中的反应活性。这些玻璃浸出行为的定性差异可用不同的预处理来解释。酸洗和硅烷化处理会改变玻璃颗粒的表面，从而导致浸出过程延迟，而未经处理的玻璃呈现出快速的初始浸出，但它们的酸反应活性很快就会减缓。酸反应活性的定量差异可与玻璃的平均化学成分相关联。在这方面，浸出倾向会随着网络住留阳离子与Al3+离子比例的增加而增大。这些结果为根据玻璃特性来解释、预测和控制水门汀性能提供了基础依据。
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