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Long-term mechanical characteristics of resin-modified glass ionomer restorative materials

Objectives. The purpose of this study was to compare the effects of long-term water storage on the mechanical characteristics of four resinmodified glass ionomer restorative materials with those of a conventional glass ionomer cement and a resin composite material. Methods. Cylindrical specimens wer...

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Bibliographic Details
Published in:Dental materials 1996, Vol.12 (1), p.64-69
Main Authors: Uno, Shigeru, Finger, Werner J., Fritz, Ulrike
Format: Article
Language:English
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Summary:Objectives. The purpose of this study was to compare the effects of long-term water storage on the mechanical characteristics of four resinmodified glass ionomer restorative materials with those of a conventional glass ionomer cement and a resin composite material. Methods. Cylindrical specimens were prepared and stored in water for 1 h, 24 h, 1 wk, 1 mon, 3 mon and 6 mon prior to determination of diametral tensile strength (DTS) and depth of surface indentation both under 1 N load and after removal of the load. Results. Diametral tensile strength was lowest for the conventional glass ionomer cement and highest for the composite; the resin-modified glass ionomer cements were intermediate between the reference materials. Water storage reduced DTS between 24 h and 1 wk or 1 mon but then remained unaffected until the final measurements after 6 mon. The materials showed a trend toward a slight increase in the depth of indentation both under load and after removal of the load with increasing storage time. These mechanical properties indicate the position of four resin-modified glass ionomer cements on a continuum with convenional glass ionomer cement and resin composite as the end points. Significance The mechanical properties of resin-modified glass ionomers show that this group of materials is weaker than resin composite but stronger than conventional glass ionomer cement. Water storage for 6 mon has little adverse effect on the mechanical properties.
ISSN:0109-5641
1879-0097
DOI:10.1016/S0109-5641(96)80066-2