A STUDY ON THE HYGROSCOPIC EXPANSION OF COMPOMER

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Journal of the Korean Academy of Pediatric Dentistry 2002;29(1):11-18.
Published online February 28, 2002.

A STUDY ON THE HYGROSCOPIC EXPANSION OF COMPOMER

컴포머의 수화팽창에 관한 연구

박경진, 김종수, 권순원

단국대학교 치과대학 소아치과학 교실

Abstract

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 mliroleakage 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 III), Dyract AP for the experimental groups(Group II and IV). The storage time was 1 day in Group I, II and 30days in Group III, 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 IV was showed less microleakage than group II and group III in gingival margin(p<0.05).

Key Words: Hygroscopic expansion; Compomer; Microleakage