Artículos de revistas
Effect of a post-polymerization treatments on the flexural strength and vickers hardness of reline and acrylic denture base resins
Fecha
2007-11-01Registro en:
Journal of Applied Oral Science, v. 15, n. 6, p. 506-511, 2007.
1678-7757
1678-7765
10.1590/S1678-77572007000600010
S1678-77572007000600010
WOS:000256795100009
2-s2.0-38049136617
2-s2.0-38049136617.pdf
3003130522427820
5737127334248549
8867670539105403
8000248781842587
0000-0002-7375-4714
Autor
University of Várzea Grande
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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°C and 100°C for 30 minutes; and long cycle - 9 hours at 71°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°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 (α=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.