pH changes induced by bioactive glass ionomer cements

The aim of this study was to examine pH-changes in the immersion fluid of a glass ionomer cement (GIC) - bioactive glass (BAG) composite. Glass ionomer cement (GI) (GC Fuji II, GC Corporation, Tokyo, Japan) and resin modified glass ionomer cement (LCGI) (GC Fuji II, GC Corporation, Tokyo, Japan), we...

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Bibliographic Details
Published in:Key engineering materials 2004-01, Vol.254-256, p.599-602
Main Authors: Yli-Urpo, H, Soderling, E, Vallittu, P K, Narhi, T
Format: Article
Language:English
Online Access:Get full text
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Summary:The aim of this study was to examine pH-changes in the immersion fluid of a glass ionomer cement (GIC) - bioactive glass (BAG) composite. Glass ionomer cement (GI) (GC Fuji II, GC Corporation, Tokyo, Japan) and resin modified glass ionomer cement (LCGI) (GC Fuji II, GC Corporation, Tokyo, Japan), were mixed with different quantities (10 wt% and 30 wt% of the total powder weight) of BAG (granule size < 45 *mm) (S53P4, Vivoxid Ltd, Turku, Finland). GICs without BAG were used as a control. After mixing the powders for the test specimens, the appropriate liquid was added to the powder mixture, and discoid specimens (n = 3) were prepared. The specimens were immersed individually in distilled water at a constant temperature of 37DGC. The pH of the immersion liquid was measured electrometrically after 1 h, 6 h, 24 h, 2 d, 7 d and 14 d from the beginning of the immersion. The immediate pH effects of the material suspensions were also determined. The study showed that the more BAG added to GICs, the higher the increase in pH. The pH effect of LC30BAG was the highest among all study materials. Within the limitations of this study, it can be said that the GIC-BAG composites can increase the pH in an aqueous environment around the materials. The increase in pH may affect mineralizing properties of the GIC-BAG composites and possess antimicrobial effects.
ISSN:1013-9826