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

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[1] USP, Ribeirao Preto Sch Dent, Dept Dent Mat & Prosthodont, BR-14040904 Ribeirao Preto, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: GERODONTOLOGY; v. 27, n. 4, p. 297-302, DEC 2010.
Web of Science Citations: 25
Abstract

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)