Factors influencing the setting reaction of glass polyalkenoate (ionomer) cements

Abstract

The setting reaction of a number of commercially available glass polyalkenoate cements has been investigated using differential thermal analysis. There were significant differences in the rates of setting between the materials under test, with a lining material setting most rapidly. The setting reaction of these materials is associated with a mild to moderate increase in temperature of the cement, which was greatest for a fast-setting glass polyalkenoate lining material (12·5°C), mixed at a higher powder: liquid ratio than recommended by the manufacturer (P: L 4·08 : 1). The rate of set is influenced by the powder: liquid ratio for hand-mixed materials, and may be influenced by both the type and the presentation of the polyacid used by the manufacturer.