Structural characterization, biomechanical properties, and potentiodynamic polarization behavior of nickel-titanium orthodontic wire alloys

Salwa Ebaid Khier, Marquette University

Abstract

The metallurgical structures, biomechanical properties and potentiodynamic polarization behavior for a wide variety of nickel-titanium orthodontic wire alloys have been investigated. These parameters were determined using x-ray diffraction techniques, differential scanning calorimetry, bending and tension tests, and in vitro corrosion equipment. The relative amount of austenite and martensite phases in the wire structure were qualitatively determined at room temperature for both as-received and heat treated wires. The phase transformation temperatures, martensite start M$\sb{\rm s}$, martensite finish M$\sb{\rm f}$, austenite start A$\sb{\rm s}$ and austenite finish A$\sb{\rm f}$ were established for the martensite reactions in all of the NiTi orthodontic wires. The existence or absence of superelastic behavior for these wires was determined along with their activation-deactivation capabilities using bending and tension tests. The potentiodynamic polarization for the different wire alloys was carried out to compare their in vitro corrosion behavior.

Recommended Citation

Salwa Ebaid Khier, "Structural characterization, biomechanical properties, and potentiodynamic polarization behavior of nickel-titanium orthodontic wire alloys" (January 1, 1988). Dissertations (1962 - 2010) Access via Proquest Digital Dissertations. Paper AAI8904270.
http://epublications.marquette.edu/dissertations/AAI8904270

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