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A STUDY ON THE HYGROSCOPIC EXPANSION OF COMPOMER
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KMID : 0358920020290010011
Abstract
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Compomer, like resin composite, undergoes shrinkage during setting. But, due to the structure of glass ionomers and their hydrophilic nature, water sorption and subsequent expansion may lead to compensation of the shrinkage.
The purpose of this study was to evaluate the change of microleakage after 30day-water-storage of compomer and composite resin.
40 sound third molars were used for the microleakage test. Z-100 resin was used for the control groups(Group I and 1). Dyract AP for the experimental groups (Group II and N). The storage time was 1 day in Group I , II and 30days in Group ll{ , IV.
The result from the this study can be summarized as follows;
1. No significant difference could be found in microleakage of occlusal margin between each group(p)0.05).
2. In microleakage of gingival margin, no significant difference could be found between group I and II , and between group I and III (p)0.05).
3. Group N was showed less micoleakage than group II and group 1Il in gingival margin(p(0.05).
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¼öÈÆØâ;ÄÄÆ÷¸Ó;¹Ì¼¼´©Ãâ;Hygroscopic expansion;Compomer;Microleakage
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