The Effects of Gic Restorations on Enamel and Dentin Demineralization and Remineralization

Abstract

Glass-ionomer cement (GIC) restorations release fluoride after placement in the oral environment. This is assumed to be one of the reasons for the decreased prevalence of secondary caries. In the current studies, the effects of GIC restorations on demineralization and remineralization of enamel and dentin lesions were studied, in an in vitro and an intra-oral model, respectively. The in vitro pH-cycling study revealed that the excessive fluoride release of the freshly placed restorations upset the (commonly observed) mineral balance between the specimens and the de/remineralizing solutions. Anomalous patterns of calcium uptake by the specimens (with GIC) during the demineralization phase and calcium loss during the remineralization phase were observed. This was hypothetically explained from the behavior of a surface coating on the GIC restorations, which was observed with SEM. The intra-oral studies showed, after three months in situ, hypermineralization of dentin close to or in contact with the restoration. It is concluded that the fluoride released from GIC or the decreased permeability as a result of hypermineralization causes lower susceptibility of the dentin of the cavity walls.

Keywords

Enamel dentin demineralization glass-ionomer cement remineralization.

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References

Almqvist H. , Lagerlöf F. (1993). Influence of constant fluoride levels in solution on root hard tissue de- and remineralization measured by 125I absorptiometry . Caries Res 27:100-105.

Damen JJM , ten Cate JM (1992). Silica-induced precipitation of calcium phosphate in the presence of inhibitors of hydroxyapatite formation. J Dent Res 71:453-457.

DeSteno CV , Feagin FF (1975). Effect of matrix bound phosphate and fluoride on mineralization of dentin. Calcif Tissue Res 17:151-159.

Forsten L. (1991). Fluoride release and uptake by glass ionomers . Scand J Dent Res 99:241-245.

Ingram GS , Silverstone LM (1981). A chemical and histological study of artificial caries in human dental enamel in vitro. Caries Res 15:393-398.

Kleber CJ , Putt MS ( 1984). Aluminum and dental caries. A review of the literature . Clin Prev Dent 6:14-25.

Lagerweij MD , Damen JJM , ten Cate JM (1994a). Plaque and fluoride effects on lesion formation in grooves in dentin (abstract). Caries Res 28:209.

Lagerweij MD , DE Josselin de Jong E. , ten Cate JM (1994b). The video camera compared with the densitometer as a scanning device for microradiography. Caries Res 28 :353-362.

Nyvad B. , ten Cate JM , Fejerskov O. (1989). Microradiography of experimental root surface caries in man. Caries Res 23:218-224.

10.

Rezk-Lega F. , Ogaard B. , Rölla G. (1991). Availability of fluoride from glass-ionomer luting cements in human saliva. Scand J Dent Res 99:60-63.

11.

ten Cate JM (1990). In vitro studies on the effects of fluoride on de- and remineralization. J Dent Res 69(Spec Iss):614-619.

12.

ten Cate JM , Duijsters PPE (1982). Alternating demineralization and remineralization of artificial enamel lesions. Caries Res 16:201-210.

13.

ten Cate JM , van Duinen RNB (1995). Hypermineralization of dentinal lesions adjacent to glass-ionomer cement restorations. J Dent Res 74:1266-1271.

14.

ten Cate JM , Timmer K. , Shariati M. , Featherstone JDB (1988). Effect of timing of fluoride treatment on enamel de- and remineralization in vitro: a pH-cycling study. Caries Res 22:20-26.

15.

ten Cate JM , Buijs MJ , Damen JJM (1996). pH-cycling of enamel and dentin lesions in the presence of low concentrations of fluoride. Eur J Oral Sci (in press).

16.

Tyas MJ ( 1991). Cariostatic effect of glass ionomer cement: a five-year clinical study. Aust Dent J 36:236-239.