Restorative Dentistry and Endodontics
- Volume 18 Issue 1
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- Pages.1-26
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- 1993
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- 2234-7658(pISSN)
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- 2234-7666(eISSN)
THE EFFECT OF ACID ETCHING ON GLASS IONOMER CEMENT SURFACES
Glass ionomer cement 표면의 산부식 효과에 관한 연구
- Han, Seung-Weon (Department of Conservative Dentistry, College of Dentistry, Kyung Hee University) ;
- Park, Sang-Jin (Department of Conservative Dentistry, College of Dentistry, Kyung Hee University) ;
- Min, Byung-Soon (Department of Conservative Dentistry, College of Dentistry, Kyung Hee University) ;
- Choi, Ho-Young (Department of Conservative Dentistry, College of Dentistry, Kyung Hee University) ;
- Choi, Gi-Woon (Department of Conservative Dentistry, College of Dentistry, Kyung Hee University)
- 한승원 (경희대학교 치과대학 보존학교실) ;
- 박상진 (경희대학교 치과대학 보존학교실) ;
- 민병순 (경희대학교 치과대학 보존학교실) ;
- 최호영 (경희대학교 치과대학 보존학교실) ;
- 최기운 (경희대학교 치과대학 보존학교실)
- Published : 1993.04.25
Abstract
The purpose of this study was to investigate the effect of acid etching on the surface appearance and fracture toughness of five glass ionomer cements. Five kinds of commercially available glass ionomer cements including chemical curing filling type, chemical curing lining type, chemical curing metal reinforced type, light curing tilling type and light curing lining type were used for this study. The specimens for SEM study were fabricated by treating each glass ionomer cement with either visible light curing or self curing after being inserted into a rubber mold (diameter 4mm, depth 1mm). Some of the specimens were etched with 37% phosphoric acid for 0, 15, 30, 60, go seconds, at 5 minutes, 1 hour and 1 day after mixing of powder and liquid. Unetched ones comprised the control group and the others were the experimental groups. The surface texture was examined by using scanning electron microscope at 20 kV. (S-2300, Hitachi Co., Japan). The specimens for fracture toughness were fabricated by curing of each glass ionomer cement previously inserted into a metal mold for the single edge notch specimen according to the ASTME399. They were subjected to a three-point bend test after etching for 0, 30, 60, and 90 seconds at 5 minutes-, 1 hour-and 1 day-lapse after the fabrication of the specimens. The plane strain fracture toughness (
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