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NiTi superelastic orthodontic archwires with polyamide coating

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Abstract

Twenty orthodontic archwires with 55.2 % Ni and 44.8 % Ti (% weight) were subjected to a dipping treatment to coat the NiTi surface by a polyamide polymer. It has been selected a Polyamide 11 due to its remarkable long lasting performance. The transformation temperatures as well as the transformation stresses of the NiTi alloy were determined in order to know whether the coating process can alter its properties. The adhesive wear tests have been demonstrated that the wear rates as well as the dynamic friction coefficients μ of polymer coated wires are much lower than metallic wires. The corrosion studies have shown that the use of this polymer, as coating, seals the NiTi surface to prevent corrosion and the release of nickel ions. The average decrease of Ni ions release due to this coating is around 85 %.

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Acknowledgements

The authors want to thank the Spanish government for their financial support through project CYCIT MAT2012-30706.

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Authors and Affiliations

  1. Unidad Docente de Ortodoncia, Facultad de Odontología, Universidad de Murcia, Murcia, Spain

    L. A. Bravo

  2. Biomateriales, Biomecànica e Ingeniería de Tejidos, Dept. Ciencia de Materiales e Ingeniería Metalúrgica, ETSEIB, Centre de Recerca Nanoenginyeria, Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028, Barcelona, Spain

    A. González de Cabañes, J. M. Manero, E. Rúperez & F. Javier Gil

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  1. L. A. Bravo
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  2. A. González de Cabañes
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  3. J. M. Manero
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  4. E. Rúperez
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  5. F. Javier Gil
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Correspondence to F. Javier Gil.

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Bravo, L.A., de Cabañes, A.G., Manero, J.M. et al. NiTi superelastic orthodontic archwires with polyamide coating. J Mater Sci: Mater Med 25, 555–560 (2014). https://doi.org/10.1007/s10856-013-5070-7

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  • DOI: https://doi.org/10.1007/s10856-013-5070-7

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