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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 20, n. 4, p. 331-335, 2009-00-00.

Resumo

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)

• Processo FAPESP: 06/05694-7 - Efeito de soluções higienizadoras sobre a resistência à flexão de resinas acrílicas termopolimerizáveis
• Beneficiário: Nathália de Queiroz Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 06/56805-3 - Avaliação in vitro da ação do hipoclorito de sódio e de pastilhas efervescentes quanto à alteração de cor, resistência à flexão e ruggosidade superficial em resinas acrílicas termopolimerizáveis
• Beneficiário: Helena de Freitas Oliveira Paranhos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/54119-5 - Avaliação in vitro da ação do hipoclorito de sódio e de pastilhas efervescentes quanto à alteração de cor em resinas acrílicas termopolimerizáveis e de microondas
• Beneficiário: Amanda Peracini
• Modalidade de apoio: Bolsas no Brasil - Mestrado