Effects of Denture Cleansers on Heat-Polymerized Acrylic Resin: A Five-Year-Simulated Period of Use

Author(s)

Carolina Noronha Ferraz Arruda ^[1] ; Danilo Balero Sorgini ^[2] ; Viviane de Cássia Oliveira ^[3] ; Ana Paula Macedo ^[4] ; Cláudia Helena Silva Lovato ^[5] ; Helena de Freitas Oliveira Paranhos ^[6]

Affiliation

^[1] Universidade de São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthetics - Brasil

^[2] Universidade de São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthetics - Brasil

^[3] Universidade de São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthetics - Brasil

^[4] Universidade de São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthetics - Brasil

^[5] Universidade de São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthetics - Brasil

^[6] Universidade de São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthetics - Brasil

• Document type: Journal article
• Source: Brazilian Dental Journal; v. 26, n. 4, p. 404-408, 2015-08-00.

Abstract

<p>This study evaluated color stability, surface roughness and flexural strength of acrylic resin after immersion in alkaline peroxide and alkaline hypochlorite solutions, simulating a five-year-period of use. Sixty disc-shaped (16x4 mm) and 60 rectangular specimens (65x10x3.3 mm) were prepared from heat-polymerized acrylic resin (Lucitone 550) and assigned to 3 groups (n=20) of immersion (20 min): C1: distilled water; AP: warm water and one alkaline peroxide tablet; SH: 0.5% NaOCl solution. Color data (∆E) were determined by a colorimeter and also quantified according to the National Bureau of Standards units. A rugosimeter was used to measure roughness (μm) and the flexural strength (MPa) was measured using a universal testing machine. Data were evaluated by Kruskal-Wallis followed by Dunn tests (color stability and surface roughness) and by one-way ANOVA and Bonferroni test (flexural strength). For all tests was considered α=0.05. AP {0.79 (0.66;1.42)} caused color alteration significantly higher than C1 {0.45 (0.37;0.57)} and SH {0.34 (0.25;0.42)}. The mean ∆Ε values quantified by NBS were classified as "trace" for C1 (0.43) and SH (0.31) and "slight" for AP (0.96). SH {-0.015 (-0.023;0.003)} caused significantly higher ΔRa than the C1 {0.000 (-0.004;0.010)} and AP {0.000 (-0.009;0.008)} groups. There was no statistically significant difference among the solutions for flexural strength (C1: 84.62±16.00, AP: 85.63±12.99, SH: 84.22±14.72). It was concluded that immersion in alkaline peroxide and NaOCl solutions simulating a five-year of 20 min daily soaking did not cause clinically significant adverse effects on the heat-polymerized acrylic resin.</p> (AU)

• FAPESP's process: 11/22898-3 - Complete denture hygiene solutions: adverse effects on heat-polymerized acrylic resin
• Grantee: Carolina Noronha Ferraz de Arruda
• Support Opportunities: Scholarships in Brazil - Scientific Initiation