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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.)

Comparison of physical and mechanical properties of microwave-polymerized acrylic resin after disinfection in sodium hypochlorite solutions

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Author(s):
Helena de Freitas Oliveira Paranhos [1] ; Letícia Resende Davi [2] ; Amanda Peracini [3] ; Rafael Bellini Soares [4] ; Cláudia Helena da Silva Lovato [5] ; Raphael Freitas de Souza [6]
Total Authors: 6
Affiliation:
[1] University of São Paulo. Dental School of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil
[2] University of São Paulo. Dental School of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil
[3] University of São Paulo. Dental School of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil
[4] University of São Paulo. Dental School of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil
[5] University of São Paulo. Dental School of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil
[6] University of São Paulo. Dental School of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil
Total Affiliations: 6
Document type: Journal article
Source: Brazilian Dental Journal; v. 20, n. 4, p. 331-335, 2009-00-00.
Abstract

This study evaluated the color stability, surface roughness and flexural strength of a microwave-polymerized acrylic resin after immersion in sodium hypochlorite (NaOCl), simulating 20 min of disinfection daily during 180 days. Forty disk-shaped (15 x 4 mm) and 40 rectangular (65 x 10 x 3 mm) specimens were prepared with a microwave-polymerized acrylic resin (Onda-Cryl). Specimens were immersed in either 0.5% NaOCl, 1% NaOCl, Clorox/Calgon and distilled water (control). Color measurements were determined by a portable colorimeter. Three parallel lines, separated by 1.0 mm, were registered on each specimen before and after immersion procedures to analyze the surface roughness. The flexural strength was measured using a 3-point bending test in a universal testing machine with a 50 kgf load cell and a crosshead speed of 1 mm/min. Data were analyzed statistically by ANOVA and Tukey's test (?=0.05). There was no statistically significant differences (p>0.05) among the solutions for color, surface roughness and flexural strength. It may be concluded that immersion in NaOCl solutions simulating short-term daily use during 180 days did not influence the color stability, surface roughness and flexural strength of a microwave-polymerized acrylic resin. (AU)