Composition and Transitional Temperature Range of Several Nickel-Titanium Alloy Wires in Orthodontic Treatment

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 17°C to 59°C. 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.

• Periodical: Applied Mechanics and Materials (Volume 87)
• Pages: 20-25
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.87.20
• Online since: August 2011
• Authors: Rutchadakorn Isarapatanapong, Surachai Dechkunakorn, Niwat Anuwongnukroh, Nattiree Chiranavanit, Julathep Kajorchaiyakul, Anak Khantachawana
• Keywords: Composition, NiTi Alloy, Transitional Temperature Range

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