study of compressive strength and fluoride release from light-cured and auto-cured glass ionomer cement liners

ABSTRACT

This study attempted to evaluate one type of light-cured glass ionomer cement liner [Vitra-bond] compared with conventional auto-cured type [Ketac-bond] through the study of compressive strength at different periods of time [1 hour, 24 hours, and 1 week following mixing] and the measurement of fluoride released from them in artificial saliva every 24 hours for 30 days were investigated. From the present study, it is concluded that the compressive strength values for both light and auto-cured glass ionomer liners tested increased with time. There was no significant differences between them in the 1 hour compressive strength values, while highly significant differences were noted after 24 hours and 1 week. In general, the strength of Vitra-bond was greater than that of Ketac-bond at the different periods of measurements. Fluoride release patterns were similar for all glass-ionomer cements tested, i.e. a large initial release was followed by a rapid decline in the amount released with some fluctuation within the observation period [30 days]. Vitra-bond showed the highest mean values of fluoride release, while Ketac-bond showed the lowest values over the test period