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Seo RS, Vergani CE, Giampaolo ET, et al. Effect of a post-polymerization treatments on the flexural strength and Vickers hardness of reline and acrylic denture base resins. J Appl Oral Sci. 2007;15(6):506-11doi: 10.1590/s1678-77572007000600010.
Seo, R. S., Vergani, C. E., Giampaolo, E. T., Pavarina, A. C., & Machado, A. L. (2007). Effect of a post-polymerization treatments on the flexural strength and Vickers hardness of reline and acrylic denture base resins. Journal of applied oral science : revista FOB, 15(6), 506-11. https://doi.org/10.1590/s1678-77572007000600010
Seo, Rosangela Seiko, et al. "Effect of a post-polymerization treatments on the flexural strength and Vickers hardness of reline and acrylic denture base resins." Journal of applied oral science : revista FOB vol. 15,6 (2007): 506-11. doi: https://doi.org/10.1590/s1678-77572007000600010
Seo RS, Vergani CE, Giampaolo ET, Pavarina AC, Machado AL. Effect of a post-polymerization treatments on the flexural strength and Vickers hardness of reline and acrylic denture base resins. J Appl Oral Sci. 2007 Dec;15(6):506-11. doi: 10.1590/s1678-77572007000600010. PMID: 19089189; PMCID: PMC4327500.
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J Appl Oral Sci. 2007 Dec;15(6):506-11. doi: 10.1590/s1678-77572007000600010.

Effect of a post-polymerization treatments on the flexural strength and Vickers hardness of reline and acrylic denture base resins.

Journal of applied oral science : revista FOB

Rosangela Seiko Seo, Carlos Eduardo Vergani, Eunice Teresinha Giampaolo, Ana Claudia Pavarina, Ana Lucia Machado

Affiliations

  1. Dental School, University of Várzea Grande, Várzea Grande, MT, Brazil.

PMID: 19089189 PMCID: PMC4327500 DOI: 10.1590/s1678-77572007000600010

Abstract

This study evaluated the effect of water-bath and microwave post-polymerization treatments on the flexural strength and Vickers hardness of four autopolymerizing reline resins (Duraliner II-D, Kooliner-K, Tokuso Rebase Fast-TR and Ufi Gel Hard C-UGH) and one heat-polymerized acrylic resin (Lucitone 550-L), processed using two polymerization cycles (short cycle - 90 minutes at 73 degrees C and 100 degrees C for 30 minutes; and long cycle - 9 hours at 71 degrees C). For each material, thirty specimens (64 x 10 x 3.3 mm) were made and divided into 3 groups (n=10). Specimens were tested after: processing (control group); water-bath at 55 degrees C for 10 minutes (reline materials) or 60 minutes (L); and microwave irradiation. Flexural strength tests were performed at a crosshead speed of 5 mm/min using a three-point bending device with a span of 50 mm. The flexural strengths values were calculated in MPa. One fragment of each specimen was submitted to Vickers hardness test. Data were analyzed by 2-way ANOVA followed by Tukey's HSD test (alpha=0.05). L microwaved specimens (short cycle) exhibited significantly higher flexural strength means than its respective control group (p<0.05). Water-bath promoted a significant increase (p<0.05) in flexural strength of K and L (long cycle). The hardness of the tested materials was not influenced by the post-polymerization treatments. Post-polymerization treatments could be used to improve the flexural strength of some materials tested.

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