Comparação da razão carga-deflexão do fio flexy-multi® com fios de aço, beta-titânio e níquel-titânio de diversas marcas comerciais

• Ano de defesa: 2011
• Autor(a) principal: Póvoa, Vinícius Marcelo Aires
• Orientador(a): Lenza, Marcos Augusto
• Banca de defesa: Lenza, Marcos Augusto, Sakima, Maurício Tatsuei, Reges, Rogério Vieira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• dARK ID: ark:/38995/001300000cs7x
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Odontologia (FO)
• Departamento: Faculdade de Odontologia - FO (RG)
• País: Brasil
• Palavras-chave em Português: Ortodontia; Fios ortodônticos; Titânio; Níquel; Ligas de cromo
• Palavras-chave em Inglês: Orthodontics; Orthodontic archwires; Titanium; Nickel; Chromium alloys
• Área do conhecimento CNPq: ODONTOLOGIA::ORTODONTIA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/6020

Flexy-Multi™, a newly introduced finishing wire with the outermost portion of its crosssection composed by nickel-titanium and its core by beta-titanium, was evaluated according to its flexural behavior in bending tests. The aim of this study was to compare the loaddeflection rate of Flexy-Multi™ to stainless-steel, beta titanium and nickel-titanium archwires in three-point bending test. The samples examined included 0.017”x 0.025”-inch stainlesssteel, beta-titanium, nickel-titanium and Flexy-Multi™ wires. Each combination, alloy and manufacturer, was tested 6 times and an average was obtained for comparison. All specimens were tested in a universal testing machine (EMIC DL10.000/700) in a 3-point bending test at a speed of 1mm per minute and deflected for 1.5 mm. Loading and unloading forces were recorded at each 0.5mm of deflection and load-deflection curves were determined. Three self-ligating brackets of lower incisors (In-Ovation – GAC Orthodontics, Roth prescription, slot .022”x.028”) were used as supports to the wires. On loading, there was no difference between Flexy-Multi™ and all nickel-titanium wires tested. On the other hand, Flexy-Multi™ showed lower load-deflection rates than all stainless-steel and betatitanium wires both on loading and unloading (p>0.05). On unloading, Flexy-Multi™ showed lower load-deflection rate than all nickel-titanium wires just to 0.5mm of deflection (p<0.05). Flexy-multi™ presented a lower load-deflection rate than all wires tested, except when compared to nickel-titanium where this difference came up just at the level of 0.5mm of unloading, since this wire lost force by the end of the test.