The effect of polymerization cycles on porosity of microwave-processed denture base resin

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dc.contributor.authorCompagnoni, Marco Antonio [UNESP]
dc.contributor.authorBarbosa, D. B.
dc.contributor.authorde Souza, R. F.
dc.contributor.authorPero, Ana Carolina [UNESP] [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:22:46Z
dc.date.available2014-05-20T15:22:46Z
dc.date.issued2004-03-01
dc.description.abstractStatement of problem. Although most of the physical properties of denture base resin polymerized by microwave energy have been shown to be similar to resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem.Purpose. This study evaluated the effect of different microwave polymerization cycles on the porosity of a denture base resin designed for microwave polymerization.Material and methods. Thirty-two rectangular resin specimens (65 X 40 X 5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized resin) and I control group (T; Classico, heat-polymerized resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes + 500 W for 90 seconds, (C) 320 W for 3 minutes + 0 W for 4 minutes + 720 W for 3 minutes, and (T) 74degreesC for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (alpha = .05).Results. The mean values and SDs of the percent mean porosity were: A = 1.05% +/- 0.28%, B = 0.91% +/- 0.15%, C = 0.88% +/- 0.23%, T = 0.93% +/- 0.23%. No significant differences were found in mean porosity among the groups evaluated.Conclusion. Within the limitations of this study, a denture base resin specifically designed for microwave Polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized denture base resin tested.en
dc.description.affiliationSão Paulo State Univ, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, Araraquara, Brazil
dc.description.affiliationAracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, Araraquara, Brazil
dc.format.extent281-285
dc.identifierhttp://dx.doi.org/10.1016/j.prosdent.2004.01.006
dc.identifier.citationJournal of Prosthetic Dentistry. St Louis: Mosby, Inc., v. 91, n. 3, p. 281-285, 2004.
dc.identifier.doi10.1016/j.prosdent.2004.01.006
dc.identifier.issn0022-3913
dc.identifier.lattes8921196002764597
dc.identifier.urihttp://hdl.handle.net/11449/33694
dc.identifier.wosWOS:000220582300016
dc.language.isoeng
dc.publisherMosby, Inc
dc.relation.ispartofJournal of Prosthetic Dentistry
dc.relation.ispartofjcr2.347
dc.relation.ispartofsjr1,087
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleThe effect of polymerization cycles on porosity of microwave-processed denture base resinen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderMosby, Inc
unesp.author.lattes8921196002764597
unesp.author.lattes2999722781960616[4]
unesp.author.orcid0000-0001-8439-0816[1]
unesp.author.orcid0000-0001-8437-9991[3]
unesp.author.orcid0000-0002-0203-2386[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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