Effect of disinfection by microwave irradiation on the strength of intact and relined denture bases and the water sorption and solubility of denture base and reline materials

This study evaluated the influence of microwave disinfection on the strength of intact and relined denture bases. Water sorption and solubility were also evaluated. A heat‐polymerized acrylic resin (Lucitone 550) was used to construct 4‐mm‐thick (n = 40) and 2‐mm‐thick (n = 160) denture bases. Dentu...

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Veröffentlicht in:Journal of applied polymer science 2008-01, Vol.107 (1), p.300-308
Hauptverfasser: Seó, Rosangela Seiko, Vergani, Carlos Eduardo, Giampaolo, Eunice Teresinha, Pavarina, Ana Cláudia, Reis, José Maurício dos Santos Nunes, Machado, Ana Lucia
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Sprache:eng
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Zusammenfassung:This study evaluated the influence of microwave disinfection on the strength of intact and relined denture bases. Water sorption and solubility were also evaluated. A heat‐polymerized acrylic resin (Lucitone 550) was used to construct 4‐mm‐thick (n = 40) and 2‐mm‐thick (n = 160) denture bases. Denture bases (2‐mm) were relined with an autopolymerizing resin (Tokuso Rebase Fast, Ufi Gel Hard, Kooliner, or New Truliner). Specimens were divided into four groups (n = 10): without treatment, one or seven cycles of microwave disinfection (650 W for 6 min), and water storage at 37°C for 7 days. Specimens were vertically loaded (5 mm/min) until failure. Disc‐shaped specimens (50 mm × 0.5 mm) were fabricated (n = 10) to evaluate water sorption and solubility. Data on maximum fracture load (N), deflection at fracture (mm), fracture energy (N mm), water sorption (%), and solubility (%) were analyzed by two‐way analysis of variance and Student–Newman–Keuls tests (α = 0.05). One cycle of microwave disinfection decreased the deflection at fracture and fracture energy of Tokuso Rebase Fast and New Truliner specimens. The strength of denture bases microwaved daily for 7 days was similar to the strength of those immersed in water for 7 days. Microwave disinfection increased the water sorption of all materials and affected the solubility of the reline materials. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
ISSN:0021-8995
1097-4628
DOI:10.1002/app.27120