Effect of clinical use of nickel-titanium springs

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dc.contributor.authorMagno, Amanda Fahning
dc.contributor.authorMonini, André da Costa
dc.contributor.authorCapela, Marisa Veiga [UNESP]
dc.contributor.authorMartins, Lidia Parsekian [UNESP]
dc.contributor.authorMartins, Renato Parsekian [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-10-21T20:20:59Z
dc.date.available2015-10-21T20:20:59Z
dc.date.issued2015-07-01
dc.description.abstractIntroduction: Our objectives were to determine whether there are changes on the load deflection rate (L/DP) and the average force (FP) of the superelastic pseudoplateau, and whether permanent deformation is changed in nickel-titanium closed-coil springs (CCSs) after 6 months of clinical use. Methods: Twenty-two nickel-titanium CCSs (Sentalloy 100 g; Dentsply GAC, York, Pa) were subjected to tensile mechanical testing at 37 degrees C on activations varying from 3.2 to 16.0 mm before and after 6 months of clinical use. A regression line was fitted over the most horizontal area of the unloading part of the stress-strain graph of every CCS, and its slope was used as L/DP. The FP was determined by the midpoint of the longest segment of the curve that could be fit within the regression line with a R-2 of at least 0.999, and permanent deformation was determined graphically by obtaining the strain value when the measured stress reached zero. The data were analyzed by 3 analyses of variance at 2 levels, with 5% of significance. Results: Time and activation significantly influenced the variables tested (P < 0.001). Time increased the L/DP and permanent deformation but decreased the FP. Activation decreased L/DP, FP, and permanent deformation. Significant interactions between time and activation were detected for FP (P = 0.013) and deformation (P < 0.001). Conclusions: After 6 months of active clinical use, the analyzed springs had a significant but small increase in their L/DP; FP dropped up to 88%, and the CCSs deformed up to 1.26 mm.en
dc.description.affiliationUnespUniversidade Estadual Paulista, Departamento de Físico Química, Instituto de Química de Araraquara
dc.description.affiliationUnespUniversidade Estadual Paulista, Departamento de Clínica Infantil, Faculdade de Odontologia de Araraquara
dc.format.extent76-82
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0889540615004254
dc.identifier.citationAmerican Journal Of Orthodontics And Dentofacial Orthopedics. New York: Mosby-elsevier, v. 148, n. 1, p. 76-82, 2015.
dc.identifier.doi10.1016/j.ajodo.2015.02.028
dc.identifier.issn0889-5406
dc.identifier.lattes2105396012022450
dc.identifier.lattes5782696565602340
dc.identifier.urihttp://hdl.handle.net/11449/129091
dc.identifier.wosWOS:000357100100017
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofAmerican Journal Of Orthodontics And Dentofacial Orthopedics
dc.relation.ispartofjcr1.842
dc.relation.ispartofsjr1,289
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleEffect of clinical use of nickel-titanium springsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes2105396012022450
unesp.author.lattes5782696565602340
unesp.author.orcid0000-0002-9678-0798[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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Artigos - Físico Química - IQ
Artigos - Clínica Infantil - FOAR