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J Korean Acad Pediatr Dent. 2001;28(1): 146-153.
A STUDY ON CHANGE OF COMPRESSIVE STRENGTH AND FLEXURAL STRENGTH OF DENTAL COMPOSITE RESIN AFTER WATER STORAGE
정내정, 김정욱, 이상훈
서울대학교 치과대학 소아치과학교실 및 치학연구소
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ABSTRACT
The difference of composition of composite resin may affect the mechanical properties of composite resin and the environment is important for the properties of materials. The composite resin restoration is always exposed to fluid in oral cavity and the composite resin matrix is able to absorb water, which is accompanied by some swelling of the composite The uptake of water by composites has been correlated with decreases in surface hardness and wear resistance. The purpose of this study was to investigate the effects of water storage in 37℃ distilled water after 7days, 30days, 60days, 120days on compressive strength and flexural strength of dental composite resin, Z-100(group 1) Spectrum(group 2), Clearfil AP-X(group 3), Pyramid(group 4), Heliomolar(group 5). The compressive and flexural strength were measured by instron machine. The following results were obtained: 1. There were significant reduction of compressive strength as water storage time increased, 7days, 30days, 60 days, 120days(p<0.05). 2. There were significant reduction of flexural strength as water storage time increased, 7days, 30days, 60days, 120days(p<0.05). 3. Group 1, 2, 3 -hybrid type showed higher compressive and flexural strength than group 5-microfine type which had lower filler contents.
Keywords: Composite resin | Matrix | Water absorption | Compressive strength | Flexural strength
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