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Type: Artigo de periódico
Title: Relining of prosthesis with auto-polymerizing hard denture reline resins: effect of post-polymerization treatment on flexural strength
Author: Takahashi, JMFK
Machado, FM
Nunez, JMC
Consani, RLX
Mesquita, MF
Abstract: Background: It has been suggested that microwave irradiation and prosthesis immersion in hot water after its polymerization may improve mechanical and viscoelastic properties of acrylic resins. Purpose: This study was proposed to verify the influence of microwave post-polymerization (PP) treatment over the flexural strength of thermo-polymerizing acrylic resin specimens (QC-20) relined or not with two different composition hard chairside auto-polymerizing reliners [Kooliner (K) and New Truliner (NT)]. Materials and Methods: For this study, 50 specimens of 64 x 10 x 3.3 mm were polymerized and distributed into five groups. G1 (control) specimens without relining and PP; G2 specimens relined with K, without PP; G3 specimens relined with NT, without PP; G4 specimens relined with K, with PP (microwave irradiation with 650 W for 5 min); G5 specimens relined with NT, with PP. Tests were performed on a universal testing machine Instron 4411 with compression speed of 5 mm/min. Results: Specimens of K without PP did not show statistically different results (p < 0.05) when compared with control. However, when submitted to PP these specimens showed a significant increase in flexural strength. Specimens of NT showed the lowest flexural strength of all groups, with or without PP when compared with control and K groups. Conclusion: Microwave PP (650 W for 5 min) proved to be an effective method of improving the flexural strength of K relined prosthesis. However, it did not seem to affect NT specimens.
Subject: denture rebasing
material resistance
denture bases
denture liner
Country: EUA
Editor: Wiley-blackwell Publishing, Inc
Citation: Gerodontology. Wiley-blackwell Publishing, Inc, v. 26, n. 3, n. 232, n. 236, 2009.
Rights: fechado
Identifier DOI: 10.1111/j.1741-2358.2008.00270.x
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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