Composition and transitional temperature range of several nickel-titanium alloy wires in orthodontic treatment
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Author list: Isarapatanapong R., Dechkunakorn S., Anuwongnukroh N., Chiranavanit N., Kajorchaiyakul J., Khantachawana A.
Publisher: Trans Tech Publications
Publication year: 2011
Volume number: 87
Start page: 20
End page: 25
Number of pages: 6
ISBN: 9783037852309
ISSN: 1660-9336
eISSN: 1662-7482
Languages: English-Great Britain (EN-GB)
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Abstract
Objective: The study aimed to clarify the compositions of 14 brands of superelastic NiTi orthodontic wires. Materials and Methods: The compositions were analysed through scanning electron microscopy and energy-dispersive X-ray microanalysis. The wires were tested in differential scanning calorimetry to find the transitional temperature range. Results: The compositions were nickel (50.085%-51.605%), titanium (46.675%-48.140%), copper (0.995%-1.155%), aluminum (0.220%-1.325%), chromium (0%-0.275%) and iron (0%-0.030%). None contained cobalt. G&H, Ormco, AMDG, IMD, Smart, TruFlex, Force 1, NIC, Sentalloy, Ortho Supply and Flexwire were almost or completely austenitic in the oral environment, whereas Highland, Grikin and Unitex were a mixture of austenitic and martensitic phase. The wires showed austenitic finish temperatures ranging from 17ฐC to 59ฐC. Conclusions: The results show that NiTi orthodontic arch wires have differences in composition and phase transformation. This information is valuable to evaluate differences in NiTi orthodontic wires for clinical use. ฉ (2011) Trans Tech Publications.
Keywords
Composition, NiTi alloy, Transitional temperature range
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