The deactivation force of superelastic nickeltitanium alloy wire stimulated by the direct electric resistance heat treatment method

Authors

Sarawadee Kunlayanapak
Vachara Phetcharakupt
Chintana Sirichompun

Publication Date

2005-01-01

Abstract

Objectives To study the deactivation force of superelastic nickel-titanium alloy wires treated by the direct electric resistance heat treatment method and to compare the deactivation forces of treated and non-treated groups in the same brand. Materials and methods The distal ends of 0.016x0.022 inches2 preformed rectangular archwires, Sentalloy Heavy type (Tomy Co. Ltd.) and NiTi (Ormco Co. Ltd.) were cut into 21.5 millimeters and tested by three-point bending method to study the deactivation force at 4 deactivation distances (2.0, 1.5, 1.0 and 0.5 millimeters). The optimum electric currents for wire bending in 3, 4 or 5 seconds were used for treating the wires. Calculated by using the Law of Energy Conservation, the theoretical temperatures were referred. Results The means of the deactivation forces were analytically compared by a One-way ANOVA at p = .05. In each brand and every deactivation distance, the deactivation forces between the treated and non-treated groups were significantly different. Conclusion The deactivation forces in the treated group were higher than those in the untreated group of each brand. In addition, the increasing in the deactivation forces of the treated group varied in accordance with the theoretical temperatures between 421.4 and 520.5oC.

DOI

10.58837/CHULA.CUDJ.28.1.3

First Page

19

Last Page

28

Recommended Citation

Kunlayanapak, Sarawadee; Phetcharakupt, Vachara; and Sirichompun, Chintana (2005) "The deactivation force of superelastic nickeltitanium alloy wire stimulated by the direct electric resistance heat treatment method," Chulalongkorn University Dental Journal: Vol. 28: Iss. 1, Article 3.
DOI: 10.58837/CHULA.CUDJ.28.1.3
Available at: https://digital.car.chula.ac.th/cudj/vol28/iss1/3