Abstract
The objective of this study was to evaluate weight changes and dimensional changes of glass ionomer(GI)cements in air and water.Specimens from three resin-modified glass ionomer(RMGI)cements and one acid-base glass ionomer(ABGI)cement were prepared and stored in air and water at 37℃ for 60 days to determine the weight change and the dimensional change.The weight change(%)of GI cements decreased with aging in air.The decreases of weight change of RMGI cements were much lower than those of ABGI cement.On the other hand, the weight change of GI cements increased with aging in water.The increase in weight change of ABGI cement in the early stage was higher than those of RMGI cements.Dimensional changes(%)of GI cements decreased with aging in air.Shrinkage of ABGI cement was much higher than those of RMGI cements.On the other hand, dimensional changes-of GI cements increased with aging in water.Expansion of RMGI cements was higher than that of ABGI cement.These results indicated that resin modification of GI cements influenced the stability of cements in air and water.Especially, expansion of RMGI cements in water may influence the behavior in vivo.
