가시광선중합화에 따른 충전용 Glass Ionomer Cement의 물리적 성질에 관한 연구
서병설, 이종철,
소속 상세정보
서병설 ( ) - 서울대학교
이종철 ( ) - 서울대학교
KMID : 0362319920170020307
Abstract
The aim of this study was to investigate the physical properties of visible light curing Glass Ionomer cement for restorative esthetic filling.
The control group was the autopolymerizing GC Fuji II Glass Ionomer cement (2.2:1 P/L ratio) and the experimental groups were made by following procedure. To induce the polymerization by visible light, the powder of GC Fuji II GI cement and the
liquid
of Vitrabond for base & liner were mixed in an amalgam capsule with 2.5:1, 3.0:1, 3.5:1 P/L ratio (% wt/wt).
After fabrication of specimens, compressive strength, fracture toughness (KIC), Scanning Electron Microscope and X-ray Diffraction, water-leachable content, marginal leakage and surface roughness were studied.
@ES The results were as follows:
@EN 1. Only experimental No. 1 group (visible light curing) showed less compressive strength than control group 1 hour after curing. Strength was increased with aging in all groups, to the compressive strength of light curing groups was no less
than
that of autopolymerizing group
2. Experimental No. 3 group (visible light curing) was inferior to No. 2 group (visible light curing) in fracture resistance but light curing groups were more resistant to fracture than auto-polymerizing group and showed ductile fracture pattern
as
compared with the brittle fracture pattern of autopolymerizing group.
3. From scanning electron microscopic image, various sized unreacted powder particles, surrounded by silica gel, were embedded in polysalt matrix. Light curing groups showed little crack and more dense unreacted particles than autopolymerizing
group.
4. From X-ray diffraction analysis, GC Fuji II Glass Ionomer cement powder and all groups showed glassy appearance but light curing groups seemed to be more intensive in crystaline than autopolymerizing group.
5. The most significant dissolution was shown in early setting period in all group. Light curing groups were dissolved less than autopolymerizing group.
6. Marginal leakage was not different significantly in case of cavity margin composed of same tooth structure (ex. only enamel margin, only dentin margin) but much more leakage was shown in dentin/cementum margin than enamel margin. In only case
of
only enamel margin, light curing groups were superior to autopolymerizing group.
7. All groups showed relatively smooth surface, which irregularity was less than 1 μm. Light curing groups were smoother than autopolymerizing group.
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