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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Rosangela Seiko Seo [1] ; Carlos Eduardo Vergani [2] ; Eunice Teresinha Giampaolo [3] ; Ana Claudia Pavarina [4] ; Ana Lucia Machado [5]
Total Authors: 5
Affiliation:
[1] University of Várzea Grande. Dental School - Brasil
[2] São Paulo State University. Dental School of Araraquara. Department of Dental Materials and Prosthodontics - Brasil
[3] São Paulo State University. Dental School of Araraquara. Department of Dental Materials and Prosthodontics - Brasil
[4] São Paulo State University. Dental School of Araraquara. Department of Dental Materials and Prosthodontics - Brasil
[5] São Paulo State University. Dental School of Araraquara. Department of Dental Materials and Prosthodontics - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Applied Oral Science; v. 15, n. 6, p. 506-511, 2007-12-00.
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 73ºC and 100ºC for 30 minutes; and long cycle - 9 hours at 71ºC). 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 55ºC 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. (AU)