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Purpose: The purpose of this study was to evaluate flexural strength, composite surface and fractured surface of three different indirect composite resins. Methods: Fifteen bar-shaped specimens ($25mm{\times}2mm{\times}2mm$) were fabricated for each FL group (Flow type and Light curing) and PLP group (Putty type and Light, Pressure curing) and PL group (Putty type and Light curing) according to manufacturer's instructions and ISO 10477. Fabricated specimens were stored in the distilled water for 24 hours at the temperature of $37^{\circ}C$. Three-point bending strength test was performed to measure flexural strength using universal testing machine at a crosshead speed of 1mm/min (ISO 10477). Surface and fractured surface of specimens were observed by digital microscope. Results were analyzed with Kruskal-wallis tests (${\alpha}=0.05$). Results: Mean (SD) of three different indirect composite resins were 83.38 (6.67) MPa for FL group, 139.90(16.53) MPa for PLP group and 171.72(16.74) MPa for PL group. Flexural strength were statistically significant (p<0.05). Differences were not observed at fractured surface among three groups. However, many pores over $100{\mu}m$ were observed at PL group in observing surface of specimen. Conclusion: Flexural strength of composite resins was affected by second polymerization method and content of inorganic filler.
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참고문헌 (32)
참고문헌 신청
Asmus sen E. / 1982 / Restorative resins: hardness and strength vs. quantity of remaining double bonds / Eur J Oral Sci 90(6):484~489
Bertolotti RL / 1997 / A new polymer glass utilized for modification and repair of fixed partial dentures / Quintessence Int 28(7):437~439
Callaghan DJ / 2006 / Effect of fiber volume fraction and length on the wear characteristics of glass fiberreinforced dental composites / Dent Mater 22(1):84~93
Chee W W / 1988 / The effect of vacuum-mixed autopolymerizing acrylic resins on porosity and transverse strength / J Prosthet Dent 60(4):517~519
Condon JJ / 1997 / Ferracane. In vitro wear of composite with varied cure, filler level, and filler treatment / J Dent Res 76(7):1405~1411
Bertolotti RL / 1997 / A new polymer glass utilized for modification and repair of fixed partial dentures / Quintessence Int 28(7):437~439
Callaghan DJ / 2006 / Effect of fiber volume fraction and length on the wear characteristics of glass fiberreinforced dental composites / Dent Mater 22(1):84~93
Chee W W / 1988 / The effect of vacuum-mixed autopolymerizing acrylic resins on porosity and transverse strength / J Prosthet Dent 60(4):517~519
Condon JJ / 1997 / Ferracane. In vitro wear of composite with varied cure, filler level, and filler treatment / J Dent Res 76(7):1405~1411
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