수종 구치부 충전용 복합레진의 물리적 성질에 관한 실험적 연구
An Experimental Study on Physical Properties of Various Posterior Restorative Composite Resins
최현우, 황의환, 김정범, 홍정표,
소속 상세정보
최현우 ( ) - 경희대학교
황의환 ( ) - 경희대학교
김정범 ( ) - 경희대학교
홍정표 ( ) - 경희대학교
KMID : 0362319860120010007
Abstract
The purpose of this study was to observe the compressive strength, compressive fatigue strength, surface hardness, water sorption and solubility of eight different posterior restorative composite resins.
Eight composite resins were tested for their strength of the compressive and compressive fatigue with prepared two different types of specimens (I and T-type) using a Instron universal testing machine (model No. 1332).
The hardness was measured with a Knoop hardness tester (MVH-2, Tokyo) for each cylindrical specimen, 7mm in diameter and 5mm thick.
The water sorption and solubility were evaluated with the prepared composite resin disks, 20mm in diameter and 1mm thick.
The results were as follows :
1. The compressive strength, compressive fatigue strength and hardness were noticed to be increased by increasing the volume content of filler.
2. The compressive strength was appeared to be independent on the type of specimen, but the compressive fatigue strength was found to be greatly influenced by the type of specimens.
3. The composite resins having higher compressive strength had also higher compressive fatigue limits.
4. The compressive fatigue limits at 10^5 stress cycles were about 50-80% of the compressive strength and were showen to be dependent on the materials and type of specimens.
5. The larger the filler particle size was, the lower was the water sorption. And the water sorption of BIS-GMA resin was higher than that of urethane resin
6. The visible light-cured composite resin had a higher value of solubility than the chemically- cured composite resin.
And the solubility tended to decrease by increasing the volume content of filler.
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