Variation of the superelastic properties and nickel release from original and reused NiTi orthodontic archwiresOriginal
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Tipus de documentArticle
Data publicació2012
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Abstract
Reuse of NiTi orthodontic wires has become increasingly common in dental clinics. For
sterilization and recovery of the original superelastic properties of the wires, a heat treatment
is usually performed between 500 and 600 ◦C. The aim of this study was to analyze
the effect of these thermal treatments on the mechanical behavior and the microstructure
of NiTi archwires of different compositions. A reduction of the Ni content was observed in
the matrix of the thermally treated archwires, due to the formation of Ti3Ni4 precipitates.
The nickel-rich precipitates were observed and characterized by Transmission Electron Microscopy
(TEM) and electron diffraction. They were found to alter the mechanical properties
of the wires, decreasing the transformation stresses, and causing a loss of activation of the
NiTi archwires. The release of nickel was higher in the original archwires than in the reused
ones, due to the matrix nickel depletion caused by the precipitation of Ti3Ni4.
CitacióGil, F.J. [et al.]. Variation of the superelastic properties and nickel release from original and reused NiTi orthodontic archwiresOriginal. "Journal of the mechanical behavior of biomedical materials", 2012, vol. 6, núm. 2, p. 113-119.
ISSN1751-6161
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