레진강화형 글라스아이오노머의 2 축 굽힘강도
BI-AXIAL FRACTURE STRENGTH OF RESIN MODIFIED GLASS OINOMERS
소속 상세정보
1임미경/1Mi Kyung Im
1구대회/2이용근/3이정식/1Dae Hoi Koo/2Yong Keun Lee/3Chung Sik Lee
KMID : 0362319970220020751
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 clinical advantages.
The purpose of this study was to evaluate the bi-axial fracture strength of four
resin-modified 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
manufacturer's 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 sand-papers up to No. 600 silicone carbide paper. The specimens
were thermocycled for 2,000 cycles between 5℃ and 55℃ distilled water. After
thermocycling, bi-axial fracture strengths were measured using a compressive-tensile
tester(Zwick 1456 Z020, Germany) with the cross head speed of 0.5mm/minute.
The results were as follows : 1. Two factors of the kind and color of materials had a
main effect on bi-axial fracture strength (p<0.01), and bi-axial fracture strength was
influenced significantly by the kinds of materials (p<0.01). But there was no significant
interaction between two variables of the kind and color of materials (p>0.05).
2. Comparing the mechanical properties of the materials, the elastic modulus of Z100
was higher than any other material, and there was no difference in the displacement at
fracture among material, The bi-axial fracture strength of Z100 was significantly higher
than any other material, and that of resin-modified glass ionomers was significantly
higher than that of conventional glass ionomer (p<0.05).
3. In the same material group, the color of material had little influence on the
mechanical properties.
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