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VOLUME 16 , ISSUE 2 ( February, 2015 ) > List of Articles


Deflection Evaluation of Thermoactivated Nickel-Titanium Archwires after Heat Treatment on their Distal Ends

Mateus Rodrigues Tonetto, Alvaro Henrique Borges, Rudys Rodolfo de Jesus Tavarez, Júlio de Araújo Gurgel, Etevaldo Matos Maia Filho, Matheus Coelho Bandeca, Fausto Silva Bramante, Francisco Machado da Fonseca, Célia Regina Maio Pinzan-Vercelino

Citation Information : Tonetto MR, Borges AH, de Jesus Tavarez RR, de Araújo Gurgel J, Filho EM, Bandeca MC, Bramante FS, da Fonseca FM, Pinzan-Vercelino CR. Deflection Evaluation of Thermoactivated Nickel-Titanium Archwires after Heat Treatment on their Distal Ends. J Contemp Dent Pract 2015; 16 (2):91-95.

DOI: 10.5005/jp-journals-10024-1642

Published Online: 01-06-2015

Copyright Statement:  Copyright © 2015; The Author(s).



This study evaluated in vitro the mechanical changes of 0.018” (0.45 mm) and 0.016 × 0.022” (0.40 × 0.55 mm) thermoactivated nickel-titanium archwires subjected to heat treatment on their distal ends.

Materials and methods

Ten archwires in diameters 0.018” and 0.016 × 0.022” by different manufacturers Ormco, Morelli, Orthometric and Unitek were tested. Each tested archwire had an experimental side, submitted to heat treatment, and an annealing-free control. Tests for load/deflection were performed using a universal testing machine, with temperature control in the austenitic transformation phase through temperaturecontrolled chamber. The variables showed normal distribution (Kolmogorov-Smirnov), the t-student test was applied in order to observe the difference between the experimental and control groups. Statistical significance was set at p < 0.05.


There were no statistically significant differences between the groups.


Heat treatment carried out in the region corresponding to the first molar distal region on thermoactivated nickel-titanium archwires did not influence the load/deflection values in adjacent portion.

How to cite this article

Bramante FS, da Fonseca Junior FM, Pinzan-Vercelino CRM, de Araújo Gurgel J, de Jesus Tavarez RR, Filho EMM, Tonetto MR, Borges AH, Bandéca MC. Deflection Evaluation of Thermoactivated Nickel-Titanium Archwires after Heat Treatment on their Distal Ends. J Contemp Dent Pract 2015;16(2):91-95.

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