Effect of the physical properties of acrylic resin of overnight immersion in sodium hypochlorite solution

Autor(es)

Davi, Leticia Resende ^[1] ; Peracini, Amanda ^[1] ; Ribeiro, Nathalia de Queiroz ^[1] ; Soares, Rafael Bellini ^[1] ; Lovato da Silva, Claudia Helena ^[1] ; Oliveira Paranhos, Helena de Freitas ^[1] ; de Souza, Raphael Freitas ^[1]

Afiliação do(s) autor(es)

^[1] USP, Ribeirao Preto Sch Dent, Dept Dent Mat & Prosthodont, BR-14040904 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GERODONTOLOGY; v. 27, n. 4, p. 297-302, DEC 2010.
• Citações Web of Science: 25

Resumo

Objectives: This study evaluated colour stability, surface roughness and flexural strength of microwave-polymerised acrylic resin after overnight immersion in sodium hypochlorite, simulating 180 days use. Materials and methods: Forty disc-shaped (15 mm x 4 mm) and 40 rectangular specimens (65 mm x 10 mm x 3 mm) were prepared from microwave-polymerised acrylic resin. The specimens were immersed in 0.5, 1% sodium hypochlorite, Clorox/Calgon and distilled water. Colour measurements (Delta E) were determined by a portable colorimeter. A surface analyser was used to measure roughness (mu m). The flexural strength (MPa) was measured using a three-point bending test in a universal testing machine. Data were evaluated by one-way anova, followed by Student-Newman-Keuls test (alpha = 0.05). Results: Statistical analysis found significantly higher colour changes (SNK, p < 0.001) for the 1% sodium hypochlorite, but mean Delta E value quantified by National Bureau of Standards was classified as slight. When comparing the surface roughness, no statistical significance was found among the solutions (anova, p = 0.637). The 1% sodium hypochlorite presented significantly lower flexural strength compared with the control group (SNK, p = 0.034). Conclusion: It was concluded that immersion in 1% sodium hypochlorite solutions for 8 h does influence the colour stability and flexural strength of microwave-polymerised acrylic resin, during the simulated period of 180 days. (AU)

• 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
• 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