시간 경과 및 표면 처치에 따른 Glass ionomer cement의 flexural strength의 변화에 관한 실험적 연구
AN EXPERIMENTAL STUDY ON THE CHANGES OF FLEXURAL STRENGTH OF GLASS IONOMER CEMENT FOLLOWING SURFACE TREATMENT
김병우, 민병순, 최호영, 이상래,
소속 상세정보
김병우 ( ) - 경희대학교 치과대학 보존학교실
민병순 ( ) - 경희대학교 치과대학 보존학교실
최호영 ( ) - 경희대학교 치과대학 보존학교실
이상래 ( ) - 경희대학교 치과대학 보존학교실
KMID : 0352219890110000551
Abstract
The purpose of this study was to examine the effect of surface treatment on the flexural strength of glass ionomer cement with time elapsed.
Glass ionomer cement (Fuji ionomer type II, (GC Co.) was used as experimental materials.
Glass ionomer cement was placed in a beam-shaped tenon mold (3mm x 3mm x 25mm) that was rest on a glass plate. Another flat glass was placed on the top of the mold with pressure.
After the cement was set, the specimens were divided into three groups and thirty two specimens in each group were surface-treated as follows:
No treatment group: Specimens were no surface-treated and stored at 35.6°C in distilled water.
Fuji varnish application (FA) group: Specimens were surface-treated with Fuji varnish (GC Co.) and stored at 35.6°C in distilled water.
Vaseline storage (VS) group: Specimens were no surface-treated and stored at 35.6°C in vase-line.
The flexural strength was measured after 1 day, 1 week, 2 weeks, 4 weeks from the start of mixing using Instron Universal Testing Instruments.
Results were as follows:
1. After 4 weeks, vaseline storage group exhibited the maximum flexural strength (p <0.0005).
2. The flexural strengths in no treatment group J1/ere slightly increased with time elapsed, but its difference was not significant, statistically.
3. The flexural strengths in Fuji varnish application group were increased with time elapsed (p <0.05).
4 The flexural strengths in Fuji varnish application group and vaseline storage group were greater than that in no treatment group (p <0.0005).
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