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The Scientific World Journal - Volume 2015 2015, Article ID 919142, 8 pages -

Research Article

Department of Restorative Dentistry and Dental Materials, Dental School, Federal University of Goiás, Praça Universitária Esquina com 1a Avenida, s-n, Setor Universitário, 74605-220 Goiânia, GO, Brazil

Department of Dental Materials, Piracicaba Dental School, State University of Campinas, Avenue Limeira, 901 Vila Rezende, 13414-903 Piracicaba, SP, Brazil

Department of Restorative Dentistry and Dental Materials, Dental School, State University of Londrina, Rua Pernambuco 540, Centro, 86020-120 Londrina, PR, Brazil

Received 30 July 2014; Accepted 15 September 2014

Academic Editor: Romeo Umberto

Copyright © 2015 Rodrigo Borges Fonseca et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to evaluate the flexural strength of acrylic resin bars by varying the types of resin polymerization and reinforcement methods. Fourteen groups were created by the interaction of factors in study: type of resin self-cured SC or heat-cured HC and reinforcement method industrialized glass fiber Ind, unidirectional glass fiber Uni, short glass fiber Short, unidirectional and short glass fiber Uni-Short, thermoplastic resin fiber Tpl, and steel wire SW. Reinforced bars  mm were tested in flexural strength 0.5 mm-min and examined by scanning electron microscopy SEM. Data MPa were submitted to factorial analysis, ANOVA, and Tukey and T-student tests % showing significant interaction , for SC: Uni , Uni-Short , Ind , SW , Short , Tpl , Control SC and for HC: Ind , Uni , Short , Uni-Short , Tpl , SW , and Control HC . SEM analysis showed better fiber-resin interaction for HC. Nonimpregnated fibers, irrespective of their length, tend to improve fracture strength of acrylics.





Autor: Rodrigo Borges Fonseca, Amanda Vessoni Barbosa Kasuya, Isabella Negro Favarão, Lucas Zago Naves, and Márcio Grama Hoeppner

Fuente: https://www.hindawi.com/



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