Comparative effects on acrylic resin properties of short- and long-term immersion in alkaline peroxide solution

Author(s)

Ferraz de Arruda, Carolina Noronha ; Salles, Marcela Moreira ; Peracini, Amanda ; Oliveira, Viviane de Cassia ; Macedo, Ana Paula ; Lovato da Silva, Claudia Helena ; Oliveira Paranhos, Helena de Freitas

• Document type: Journal article
• Source: AMERICAN JOURNAL OF DENTISTRY; v. 34, n. 6, p. 5-pg., 2021-12-01.

Abstract

Purpose: To evaluate the color stability (Delta E), surface roughness (Delta Ra), and flexural strength of denture base acrylic resin after short (20 minutes) and long-term (8 hours) immersions simulating a period of 5 years of use. Methods: 120 disk-shaped (16 mm x 4 mm) and 120 rectangular (65 mm x 10 mm x 3.3 mm) specimens were prepared (Lucitone 550) and distributed into three groups (n=20): distilled water (Control); Corega Tabs (CT) and Polident (Po), for immersions of 20 minutes and 8 hours. AE were determined by a colorimeter, ARa by a profilometer and the flexural strength by a universal testing machine. Data were evaluated by two-way ANOVA followed by Tukey's test and Bonferroni correction (alpha= 0.05). Results: Short-term immersions for 20 minutes resulted in significant differences in AE, as CT values (1.46 +/- 1.41) were higher than Po (0.55 +/- 0.25) and Control (0.47 +/- 0.21). Specimens immersed for 8 hours showed more extensive alterations overall than the control (AE [Po: 7.27 +/- 0.53; CT: 5.58 +/- 0.49; Control: 1.26 +/- 0.23]; ARa [Po: 0.16 +/- 0.08; CT: 0.12 +/- 0.11; Control: 0.07 +/- 0.06]; flexural strength [Po: 42.99 +/- 9.34; CT: 63.96 +/- 12.98; Control: 64.59 +/- 12.87]). The tested alkaline peroxide-based solutions promoted significant alteration on acrylic resin properties after overnight immersion. Therefore, short-term immersions seem to be more suitable for daily denture hygiene. (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