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Quintessence International
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Quintessence Int 26 (1995), No. 8     1. Aug. 1995
Quintessence Int 26 (1995), No. 8  (01.08.1995)

Page 577-581


Microleakage and thermal properties on hybrid ionomer restoratives
Puckett / Fitchie / Bennett / Hembree
The objective of this study was to compare the microleakage and thermal properties of two recently introduced hybrid materials to those of a conventional glass-ionomer cement. Class V preparations were prepared at the cementoenamel junctions in freshly extracted bovine incisor and evaluated for microleakage with a 45 Ca radioisotope method. Thermal properties were evaluated with thermal mechanical analysis and differential scanning calorimetry. The degree of microleakage and the coefficient of thermal expansion of the conventional glass-ionomer cement were found to be significantly less than those of either hybrid formulation.