Produção Nacional
Revisado por pares
Effect of the physical properties of acrylic resin of overnight immersion in sodium hypochlorite solution
2009; Wiley; Volume: 27; Issue: 4 Linguagem: Inglês
10.1111/j.1741-2358.2009.00336.x
ISSN1741-2358
AutoresLetícia Resende Davi, Amanda Peracini, Nathália de Queiroz Ribeiro, Rafael Bellini Soares, Cláudia Helena Silva‐Lovato, Helena de Freitas Oliveira Paranhos, Raphael Freitas de Souza,
Tópico(s)Endodontics and Root Canal Treatments
ResumoThis study evaluated colour stability, surface roughness and flexural strength of microwave-polymerised acrylic resin after overnight immersion in sodium hypochlorite, simulating 180 days use.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 (ΔE) were determined by a portable colorimeter. A surface analyser was used to measure roughness (μm). 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 (α = 0.05).Statistical analysis found significantly higher colour changes (SNK, p < 0.001) for the 1% sodium hypochlorite, but mean ΔE 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).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.
Referência(s)