Characterization of two orthodontic NiTi wires regarding their structures and phase transformation temperatures
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Universidade Federal de Minas Gerais
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Artigo de periódico
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NiTi orthodontic wires could be considered part of clinical arsenal as a tool to improve orthodontic treatment. This paper aims at characterizing two different orthodontic NiTi wires by considering their structure and phase transformation temperatures. Nickel Titanium Memory Wire (American Orthodontics, Sheboygan, USA), and Therma-Ti (American Orthodontics, Sheboygan, USA) wires with a rectangular cross section sized 0.48x0.64mm were investigated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Both wires exhibited irregular surfaces, Ni and Ti in equal proportions whereas a β phase was predominantly observed at room temperature. Reverse martensite temperatures obtained in the DSC experiments were in accordance with superelastic properties when considering frequent oral temperatures. These wires will be activated all the time during orthodontic treatment and should be used in cases of good periodontal health.
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Fios ortodônticos, Ortodontia
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https://medcraveonline.com/JDHODT/JDHODT-10-00468.pdf