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Physical properties (thermal, thermomechanical, magnetic, and adhesive) of some smart orthodontic wires

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Abstract

Thermal, thermomechanical, and caloric properties of commercial orthodontic wires (produced by Natural Orthodontics Corp., USA) with cylindrical and rectangular geometry were studied. Depending on the applied forces, there were identified the range of elasticity, the elasticity–viscoelasticity coexistence domain and the domain in which a maximum force of 18 N is applied, for the orthodontic wires. When increasing the thickness of orthodontic wires, deformation decreases. The Controlled Force Module, in the tension mode, was used for the determination of the orthodontic wires elongation at application of the stretching forces from 0 to 13 N, at 35 °C, maintaining each static force value for 3 min. The increase in the cross-sectional area of the orthodontic wires disfavors the process of elongation of the sample, at the same applied static force. Using the Multi-Frequency–Strain–Stress modulus, in the tension mode, DMA cyclic heating–cooling measurements were performed. The measured physical quantities for orthodontic wires were Storage Modulus, Loss Modulus, Tanδ and Stiffness, at heating and cooling. Thus, the characteristic temperatures of the phase transitions (As, Af, Ms, Mf), of all the studied orthodontic wires were identified. Also, the values of the elasticity modulus (Young’s Modulus) of the orthodontic wires were calculated at 35 °C. With the DSC Q200 device, using temperature-modulated differential scanning calorimetry method, a multi-step temperature variation program, was applied to a rectangular wire, in three stages (cooling–heating–cooling). Through the interpretation of heat fluxes (reversible, irreversible and total), the phase transitions in the formation of martensite, austenite, but also of the rombohedral phase (R-phase), were identified. Formations of austenite and martensite were also evidenced by the classical DSC method, but the classical DSC method also enabled the R-phase identification. The adherence of some food dyes on the orthodontic wires, as well as the modification of the surface roughness of the orthodontic wire after the deposition of the food dye, was also studied. By magnetic measurements, it was established that the orthodontic wires had paramagnetic properties at room temperature, and nitinol was a mixture of 49.2% austenite and 50.8% martensite.

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Authors and Affiliations

  1. Department of Physics, University of Craiova, 13 AI Cuza Street, 200585, Craiova, Romania

    G. Florian, Gabriela Iacobescu, I. Petrişor, M. Leulescu & P. Rotaru

  2. National Institute for Research and Development in Chemistry and Petrochemistry, 202 Independentei, 060021, Bucharest, Romania

    Augusta Raluca Gabor & C. A. Nicolae

  3. Ilie Murgulescu Institute of Physical Chemistry of Romanian Academy, 202 Independentei, 060021, Bucharest, Romania

    N. Stănică

  4. Department of Dentistry, University of Medicine and Pharmacy Craiova, 2-4 Petru Rareş Street, 200349, Craiova, Romania

    P. Mărăşescu

  5. Department of Electromechanics, Environment and Applied Informatics, University of Craiova, 13 AI Cuza Street, 200585, Craiova, Romania

    Sonia Degeratu

  6. Department of IMST, University of Craiova, 1st Calugareni Street, 220037, Drobeta Turnu Severin, Romania

    Oana Gîngu

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  1. G. Florian
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Florian, G., Gabor, A.R., Nicolae, C.A. et al. Physical properties (thermal, thermomechanical, magnetic, and adhesive) of some smart orthodontic wires. J Therm Anal Calorim 134, 189–208 (2018). https://doi.org/10.1007/s10973-018-7580-5

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