Effect of stress relaxation in two different preactivation methods of beta-titanium T-loops: bends vs. continuous curvature

Registro completo de metadados
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorCaldas, Sergei Godeiro Fernandes Rabelo-
Autor(es): dc.creatorMartins, Renato Parsekian-
Autor(es): dc.creatorde Araújo, Marcela Emílio-
Autor(es): dc.creatorGalvão, Marília Regalado-
Autor(es): dc.creatorReis, José Maurício dos Santos Nunes-
Autor(es): dc.creatorMartins, Lídia Parsekian-
Data de aceite: dc.date.accessioned2021-03-11T00:45:55Z-
Data de disponibilização: dc.date.available2021-03-11T00:45:55Z-
Data de envio: dc.date.issued2018-12-11-
Data de envio: dc.date.issued2018-12-11-
Data de envio: dc.date.issued2017-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.ejwf.2017.08.002-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/175143-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/175143-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionProcesso FAPESP: 2008/07258–5-
Descrição: dc.descriptionObjective Assess the changes in the force system of T-loop springs (TLSs) preactivated by bends and curvature, when secured in place with a constant strain over time. Materials and Methods A total of 120 TLSs with dimensions 6 x 10 mm, produced out of 0.017 × 0.025-inch TMA, were randomly divided into two groups of 60 TLSs, each according to what preactivation was going to be used, concentrated bends or gradual curvature. Subgroup 1 was tested immediately and the remaining subgroups were tested after they were secured at 5-mm activation for different periods of time in an interbracket distance of 23 mm. Subgroups 2, 3, 4, 5, and 6 were kept activated for 24, 48, and 72 hours, 1 and 2 weeks, respectively. Using a moment transducer coupled to a digital extensometer indicator adapted to a universal testing machine, the amount of horizontal force, moment, and moment-to-force (MF) ratios were recorded. Results Both groups showed a decrease in force levels over time (P < 0.001 and 0.005 for bend and curvature preactivation, respectively), but with different behaviors. The group preactivated by bends showed a reduction in moments over time (P < 0.001), whereas the group preactivated by curvature did not (P = 0.410). The MF ratio has not changed over time in either group. Conclusions The stress-relaxation effect is more evident on group preactivated by bends.-
Formato: dc.format98-104-
Idioma: dc.languageen-
Relação: dc.relationJournal of the World Federation of Orthodontists-
Relação: dc.relation0,196-
Direitos: dc.rightsopenAccess-
Palavras-chave: dc.subjectBeta-titanium-
Palavras-chave: dc.subjectPreactivation-
Palavras-chave: dc.subjectStress relaxation-
Palavras-chave: dc.subjectT-loop-
Título: dc.titleEffect of stress relaxation in two different preactivation methods of beta-titanium T-loops: bends vs. continuous curvature-
Tipo de arquivo: dc.typelivro digital-
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