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Type: Artigo de periódico
Title: An Alternative Method for Thermal Cycling Test: Effect on the Marginal Microleakage and Bond Strength of Dental Polymer Bonded to Dentin
Author: Consani, S
Sinhoreti, MAC
Correr-Sobrinho, L
Leite, RSB
Bortoletto, KJ
Abstract: This study evaluated an alternative method for thermal cycling test on the microleakage and bond strength of the polymer-dentin bond. For the microleakage test the cavities were restored with a TEGDMA+UDMA+bis-EMA composite polymer light cured for 20 s. Samples were immersed in 2% methylene blue solution for 2 h and sectioned. Microleakage scores were submitted to Kruskal-Wallis test. For the shear bond strength test the adhesive was applied to dentin, photoactivated for 10 s and the composite polymer incrementally photoactivated. Samples were submitted to shear bond strength test in a machine with a cross-head speed of 0.5 mm/min and data were submitted to ANOVA and Tukey's test. Studied groups were: 1 - without thermocycling; 2 - thermocycled at 5 degrees C and 55 degrees C with intermediate bath at 37 degrees C; 3 - thermocycled at 5 degrees C and 37 degrees C; 4 - thermocycled at 37 degrees C and 55 degrees C; 5 - thermocycled at 5 degrees C and 55 degrees C (traditional test). Cold baths promoted greater microleakage when compared to control and hot bath, whereas control and hot bath were similar. Cold baths presented significant lower shear bond strength than those submitted to hot bath and control. It was concluded that the alternative method for thermal cycling test showed that cold temperatures increased the microleakage and decreased the bond strength of the polymeric adhesive.
Subject: dentin bond strength
marginal microleakage
thermocycling temperatures
Country: Brasil
Editor: Univ Fed Sao Carlos, Dept Engenharia Materials
Rights: aberto
Identifier DOI: 10.1590/S1516-14392012005000114
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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