Effect of Polymerization and Type of Glass-Ionomer Cement on Thermal Behaviour
Kosmas TOLIDIS, Tiverios VAIMAKIS, Christina BOUTSIOUKI, Paris GERASIMOU

Abstract
The purpose of this study was to evaluate the effect of type of glass-ionomer cement (GIC), extrinsic energy offer and light intensity of the curing device, on thermal behavior. Ketac Molar, 3M-ESPE, USA (KM), Diamond Rapid Set Capsules, Kemdent, Wiltshire, UK (D) and Ketac N100, 3M-ESPE, USA (KN), being all different types of GIC. Measurements of coefficient of thermal expansion (CTE) were performed at 20-60oC and thermal behavior was evaluated in lower and higher temperatures. KM exhibits lower CTE values (p<0.001). D exhibits significant differences (p<0.001), showing greater CTE values. KN exhibits great differences (p<0.001) in higher temperatures. Qualitative differences were also noted in CTE diagrams, diversifying between expansion and contraction, as temperature raised. Type of GIC and light intensity of curing device affect thermal behavior. Extrinsic energy offer had no important effect on CTE values.

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