Restorative Dentistry and Endodontics
- Volume 22 Issue 2
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- Pages.751-760
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- 1997
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- 2234-7658(pISSN)
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- 2234-7666(eISSN)
BI-AXIAL FRACTURE STRENGTH OF RESIN MODIFIED GLASS IONOMERS
레진강화형 글라스아이오노머의 2 축 굽힘강도
- Lee, Yong-Keun (Dept. of Dental Materials, College of Dentistry Wonkwang University) ;
- Im, Mi-Kyung (Dept. of Conservative Dentistry, College of Dentistry Wonkwang University) ;
- Koo, Dae-Hoi (Dept. of Conservative Dentistry, College of Dentistry Wonkwang University) ;
- Lee, Chung-Sik (Dept. of Conservative Dentistry, College of Dentistry, Seoul National University)
- 이용근 (원광대학교 치과대학 치과재료학교실) ;
- 임미경 (원광대학교 치과대학 치과보존학교실) ;
- 구대회 (원광대학교 치과대학 치과보존학교실) ;
- 이정식 (서울대학교 치과대학 치과보존학교실)
- Published : 1997.09.30
Abstract
Resin-modified glass ionomers were introduced in 1988 to overcome the problems of moisture sensitivity and low early mechanical strengths of the conventional glass ionomers, and to maintain their dinical advantages. The purpose of this study was to evaluate the bi-axial fracture strength of four resinmodified glass-ionomers(Fuji II LC, Vitremer, Dyract, VariGlass), one resin composite material(Z-100), and one conventional glass-ionomer(Fuji II). Three specimens of each material and shade combination were made according to the manufacturers' instructions. Materials were condensed into metal mold with a diameter of 10mm and a thickness of 2.0mm and pressed between two glass plates. Resin-modified glass ionomers were polymerized using a Visilux II light curing unit by irradiating for 60 seconds from both sides, and conventional glass ionomer was cured chemically. After specimens were removed from the molds, surfaces were polished sequentially on wet sandpapers up to No. 600 silicone carbide paper. The specimens were thermocycled for 2,000 cycles between
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