Effect of denture cleansers on physical properties of heat-polymerized acrylic resin

Autor(es)

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

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Dent Ribeirao Preto, Dept Dent Mat & Prosthodont, Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHODONTIC RESEARCH; v. 54, n. 2, p. 78-83, APR 2010.
• Citações Web of Science: 45

Resumo

Purpose: This study aimed to measure the color change, surface roughness and flexural strength of heat-polymerized acrylic resin after its immersion in denture cleansers, simulating a 180-day use. Methods: Thirty disk-shaped (15 mm x 4 mm) and 30 rectangular samples (65 mm x 10 mm x 3.3 mm) were prepared from heat-polymerized acrylic resin and immersed in Corega Tabs, Bony Plus, and distilled water. Color measurements (DE) were determined by a portable colorimeter. A surface analyzer was used to measure the roughness before and after immersion (DRa). The flexural strength (S) was measured using a 3-point bending test. The DE values were submitted to statistical analysis by the Kruskal-Wallis test, followed by Dunn's Multiple Comparisons test. The DRa and S values were submitted to statistical analysis by ANOVA, followed by a Student-Newman-Keuls test (alpha =.05). Results: The color changes were significantly higher for the Corega Tabs than for the control group. The mean DE values quantified by the National Bureau of Standards (NBS) were classified as Trace (0.0-0.5). The Bony Plus group had significantly higher surface roughness than the other groups. Corega Tabs and Bony Plus groups presented lower flexural strength than the control group. Conclusions: Although the color changes after the immersion in denture cleansers were clinically insignificant, the Corega Tabs group showed higher color differences. The Bony Plus group showed significantly increased surface roughness. Both effervescent tablets Corega Tabs and Bony Plus significantly diminished the flexural strength of the acrylic resin. (C) 2009 Japan Prosthodontic Society. Published by Elsevier Ireland. All rights reserved. (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