Produção Nacional
Revisado por pares
Deformation of nickel-titanium closed coil springs: an in vitro study
2017; Dental Press Editora; Volume: 22; Issue: 1 Linguagem: Inglês
10.1590/2177-6709.22.1.038-046.oar
ISSN2177-6709
AutoresCamilla Ivini Viana Vieira, José Maurício dos Santos Nunes Reis, Luı́s Geraldo Vaz, Lídia Parsekian Martins, Renato Parsekian Martins,
Tópico(s)Orthopaedic implants and arthroplasty
ResumoThe aim of this paper was to determine the amount of deformation in four commercial brands of nickel-titanium closed springs.A total of 130 springs were divided into 13 subgroups, according to their features and manufacturers (Morelli, Orthometric, Ormco and GAC) and activated from 100% to 1000% of the effective length of the nickel-titanium portion present at the spring, at 37 °C. Deactivation data were plotted and deformation was found graphically. The values were compared by analysis of variance and Tukey's post-hoc test.Springs manufactured by Morelli had the same amount of deformation when they were activated up to 700% of Y activation; springs by Orthometric had the same amount of deformation up to 600-700% of Y; springs by Ormco had the same amount of deformation up to 700-800% of Y; and finally, the majority of springs by GAC had similar deformation up to 800%-1000% of activation. All springs tested could be activated up to 700% without rupture.Most subgroups were similarly deformed up to 700% of activation, without rupture of springs. Subgroups 4B, 4C, 4D and 4E showed the same amount of deformation up to 1000% of activation without any rupture at all.
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