Influence of thermal and mechanical stresses on the strength of intact and relined denture bases

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dc.contributor.authorSeo, Rosangela Seiko
dc.contributor.authorMurata, Hiroshi
dc.contributor.authorHong, Guang
dc.contributor.authorVergani, Carlos Eduardo [UNESP]
dc.contributor.authorHamada, Taizo
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionHiroshima Univ
dc.date.accessioned2014-05-20T13:46:19Z
dc.date.available2014-05-20T13:46:19Z
dc.date.issued2006-07-01
dc.description.abstractStatement of problem. Denture bases may become increasingly weaker as a result of thermal stress and flexural cyclic loading. Information regarding this potential problem and its relationship to the denture base reline is limited.Purpose. This study evaluated the influence of thermal and mechanical stresses on the strength of intact and relined denture bases.Material and methods. Twenty-eight microwave-polymerized (Acron MC) intact denture bases were prepared in the shape of a 3-mm-thick maxillary denture. Additionally, fifty-six 2-mm-thick denture bases were relined with 1 mm of autopolymerizing resin (Tokuyama Rebase Fast II or New Truliner) (n = 28). Intact and relined specimens were divided into 4 groups (n = 7) as follows: without stress (control); a mechanical stress at 0.8 Hz for 10,000 cycles; 5000 thermal cycles between 5 degrees C and 55 degrees C; or a combination thermo-mechanical stress. The specimens were vertically loaded in compression with a rounded rod at 5 mm/min until failure, using a universal testing machine. Data on maximum fracture load (N), deflection at fracture (%), and fracture energy (N-mm) were analyzed by 2-way analysis of variance and Student-Newman-Keuls tests (alpha = .05).Results. The strength of the denture bases relined with New Truliner was not significantly affected by any of the experimental conditions, but comparing the control groups, New Truliner exhibited the lowest maximum fracture load values. The maximum fracture load of intact denture bases (P = .002) and those relined with Tokuyama Rebase Fast II (P = .01) showed a significant decrease after thermal stress. Additionally, cyclic loading significantly decreased the maximum fracture load (P < .001), deflection at fracture (P = .025), and fracture energy (P < .001) of intact denture bases and those relined with Tokuyama Rebase (P values of .002, .039, and .001, respectively).Conclusion. Thermal and mechanical stresses exert deleterious effects on the strength of intact and/or relined denture bases, which vary according to the relining material used.en
dc.description.affiliationUNESP, Fac Odontol Araraquara, Dept Mat Odontol & Protese, Araraquara Dent Sch, BR-14801903 São Paulo, Brazil
dc.description.affiliationHiroshima Univ, Grad Sch Biomed Sci, Dept Prosthet Dent, Hiroshima, Japan
dc.description.affiliationUnespUNESP, Fac Odontol Araraquara, Dept Mat Odontol & Protese, Araraquara Dent Sch, BR-14801903 São Paulo, Brazil
dc.format.extent59-67
dc.identifierhttp://dx.doi.org/10.1016/j.prosdent.2006.05.007
dc.identifier.citationJournal of Prosthetic Dentistry. St Louis: Mosby, Inc., v. 96, n. 1, p. 59-67, 2006.
dc.identifier.doi10.1016/j.prosdent.2006.05.007
dc.identifier.issn0022-3913
dc.identifier.lattes3003130522427820
dc.identifier.orcid0000-0002-7375-4714
dc.identifier.urihttp://hdl.handle.net/11449/16378
dc.identifier.wosWOS:000239498900009
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.titleInfluence of thermal and mechanical stresses on the strength of intact and relined denture basesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderMosby, Inc
unesp.author.lattes3003130522427820[4]
unesp.author.orcid0000-0002-7375-4714[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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