Seo, Rosangela SeikoVergani, Carlos Eduardo [UNESP]Giampaolo, Eunice TeresinhaPavarina, Ana Claudia [UNESP]dos Santos Nunes Reis, Jose MauricioMachado, Ana Lucia [UNESP]2014-05-202014-05-202008-01-05Journal of Applied Polymer Science. Hoboken: John Wiley & Sons Inc, v. 107, n. 1, p. 300-308, 2008.0021-8995http://hdl.handle.net/11449/16534This 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 (2mm) 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 degrees C for 7 days. Specimens were vertically loaded (5 mm/min) until failure. Disc-shaped specimens (50 min x 0.5 mm) were fabricated (n = 10) to evaluate water sorption and solubility. Data on maximum fracture load (N), deflection (%), and solubility (%) were analyzed by two-way analysis of variance and Student-Newman-Keuls tests (alpha = 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. (C) 2007 Wiley Periodicals, Inc.300-308engcrosslinkingdental polymersfractureresinstensionArtigo10.1002/app.27120WOS:000250822200039Acesso restrito30031305224278205737127334248549886767053910540380002487818425870000-0002-7375-4714