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dc.typeArtigo de periódicopt_BR
dc.titleInfluence Of A Cobalt-chromium Metal Framework On Surface Roughness And Knoop Hardness Of Visible Light-polymerized Acrylic Resinspt_BR
dc.contributor.authorDe Souza Jr. J.A.pt_BR
dc.contributor.authorRodrigues Garcia R.C.M.pt_BR
dc.contributor.authorMoura J.S.pt_BR
dc.contributor.authorDel Bel Cury A.A.pt_BR
unicamp.authorRodrigues Garcia, R.C.M., Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Brazil, Av. Limeira, 901, Piracicaba, SP - Cep.: 13414 - 903, Brazilpt_BR
unicamp.authorMoura, J.S., Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Brazilpt_BR
unicamp.authorDel Bel Cury, A.A., Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Brazilpt_BR Souza Jr., J.A., Department of Dentistry, State University of Ponta Grossa (UEPG), Brazilpt
dc.description.abstractAlthough visible light-polymerized acrylic resins have been used in removable partial dentures, it is not clear whether the presence of a metal framework could interfere with their polymerization, by possibly reflecting the light and affecting important properties, such as roughness and hardness, which would consequently increase biofilm accumulation. The aim of this study was to compare the roughness and Knoop hardness of a visible light-polymerized acrylic resin and to compare these values to those of water-bath- and microwave-polymerized resins, in the presence of a metal framework. Thirty-six specimens measuring 30.0 x 4.0 ± 0.5 mm of a microwave- (Onda Cryl), a visible light- (Triad) and a water-bath-polymerized (Clássico) (control) acrylic resins containing a cobalt-chromium metal bar were prepared. After processing, specimens were ground with 360 to 1000-grit abrasive papers in a polishing machine, followed by polishing with cloths and 1-μm diamond particle suspension. Roughness was evaluated using a profilometer (Surfcorder SE 1700) and Knoop hardness (Kg/mm 2) was assayed using a microhardness tester (Shimadzu HMV 2000) at distances of 50, 100, 200, 400 and 800 μm from the metal bar. Roughness and Knoop hardness means were submitted to two-way ANOVA and compared by Tukey and Kruskal Wallis tests at a 5% significance level Statistically significant differences were found (p<0.05) for roughness and Knoop hardness, with light-polymerized resin presenting the highest values (Ra = 0.11 μm and hardness between 20.2 and 21.4 Kg/mm 2). Knoop values at different distances from the metal bar did not differ statistically (p>0.05). Within the limitations of this in vitro study, it was concluded that the presence of metal did not influence roughness and hardness values of any of the tested acrylic resins.en
dc.relation.ispartofJournal of Applied Oral Sciencept_BR
dc.identifier.citationJournal Of Applied Oral Science. , v. 14, n. 3, p. 208 - 212, 2006.pt_BR
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dc.description.provenanceMade available in DSpace on 2015-11-26T14:29:26Z (GMT). No. of bitstreams: 2 2-s2.0-33747858081.pdf: 66140 bytes, checksum: b926b27f02fc9ab152a477f328510a66 (MD5) 2-s2.0-33747858081.pdf.txt: 21947 bytes, checksum: 263cca6b0b7b77b10193025194963b2d (MD5) Previous issue date: 2006en
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