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 Ti(3)Ni(4) 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 Ti(3)Ni(4).
journal_name
J Mech Behav Biomed Materauthors
Gil FJ,Espinar E,Llamas JM,Manero JM,Ginebra MPdoi
10.1016/j.jmbbm.2011.11.005subject
Has Abstractpub_date
2012-02-01 00:00:00pages
113-9eissn
1751-6161issn
1878-0180pii
S1751-6161(11)00292-Xjournal_volume
6pub_type
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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journal_title：Journal of the mechanical behavior of biomedical materials
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