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Martensitic transformation of austenitic stainless steel orthodontic wires during intraoral exposure.
Izquierdo, Paula P; de Biasi, Ronaldo S; Elias, Carlos N; Nojima, Lincoln I.
Afiliação
  • Izquierdo PP; Departamento de Ortodontia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
Am J Orthod Dentofacial Orthop ; 138(6): 714.e1-5; discussion 714-5, 2010 Dec.
Article em En | MEDLINE | ID: mdl-21130328
INTRODUCTION: Our purpose was to study the mechanical properties and phase transformations of orthodontic wires submitted to in-vivo exposure in the mouth for different periods of time. METHODS: Stainless steel wires were tied to fixed orthodontic appliances of 30 patients from the orthodontics clinic of Universidade Federal do Rio de Janeiro School of Dentistry in Brazil. According to the duration of the clinical treatment, the patients were divided into 3 groups. After in-vivo exposure, the samples were studied by mechanical testing (torsion) and ferromagnetic resonance. Statistical analyses were carried out to evaluate the correlation between time of exposure, mechanical properties, and austenite-to-martensite transformation among the groups. RESULTS: The results were compared with as-received control samples. The torque values increased as time in the mouth increased. The increase in torque resistance showed high correlations with time of exposure (P = 0.005) and austenite-martensite phase transformation. CONCLUSIONS: The resistance of stainless steel orthodontic wires increases as the time in the mouth increases; this effect is attributed to the austenite-to-martensite transformation.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fios Ortodônticos / Aço Inoxidável / Ligas Dentárias / Boca Tipo de estudo: Clinical_trials Limite: Humans Idioma: En Revista: Am J Orthod Dentofacial Orthop Assunto da revista: ODONTOLOGIA / ORTODONTIA Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fios Ortodônticos / Aço Inoxidável / Ligas Dentárias / Boca Tipo de estudo: Clinical_trials Limite: Humans Idioma: En Revista: Am J Orthod Dentofacial Orthop Assunto da revista: ODONTOLOGIA / ORTODONTIA Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos