The Open Dentistry Journal

ISSN: 1874-2106 ― Volume 14, 2020

Effect of Clinical Use and Sterilization Process on the Transition Temperature Range of Thermally NiTi Alloys

Bruno da Silva Vieira1, Rodrigo H. Cançado2, *, Karina M.S. Freitas3, Fabrício P. Valarelli3, Renata C. Gobbi3, Ricardo C. Gobbi de Oliveira3
1 Department of Orthodontics, Bauru Dental School. University of São Paulo, Brazil / Alameda Octávio Pinheiro Brisolla 9-75, ZIP CODE 17012-901, Cidade Universitária, Bauru, São Paulo, Brazil
2 Department of Restorative Dentistry, Discipline of Orthodontics, Federal University of Minas Gerais (UFMG) / Belo Horizonte, Minas Gerais, Brazil
3 Department of Orthodontics, Uningá University Center. Rodovia PR 317, 6114, ZIP CODE 87035510, Maringá, Paraná, Brazil



Thermally activated nickel-titanium wires have been widely used by orthodontists due to more constant forces, generation over longer activation spans, greater resistance to permanent deformation, superelasticity characteristics when cyclically loaded, better spring-back and less hysteresis.


The purpose of this study was to evaluate the influence of clinical use and sterilization process on the Transition Temperature Range (TTR) of thermoset nickel-titanium wires using Differential Scanning Calorimetry (DSC).


Sections from four nickel-titanium wires (0.019 × 0.025-inch) belonging to four different brands were assessed in four different states. Two of the wires were assessed in the “as received” state, one after 60 days of clinical use, and one after 60 days of clinical use and subjected to a sterilization process (autoclaving). The segments of each archwire were tested using DSC at temperatures ranging from −80°C to 150°C at a rate of 10°C/min.


All the nickel-titanium memory thermoset wires presented with desirable property for clinical use. The shape memory property was not influenced by clinical use and sterilization process.


There was no change in TTR of the nickel-titanium wires after clinical use and sterilization.

Keywords: Orthodontic wires, Calorimetry, Materials testing, Differential scanning calorimetry, Sterilization, Alloys.

Article Information

Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 261
Last Page: 266
Publisher Id: TODENTJ-13-261
DOI: 10.2174/1874210601913010261

Article History:

Received Date: 22/02/2019
Revision Received Date: 11/06/2019
Acceptance Date: 04/07/2019
Electronic publication date: 31/07/2019
Collection year: 2019

© 2019 da Silva Vieira et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Restorative Dentistry, Discipline of Orthodontics, Federal University of Minas Gerais (UFMG), Av. Presidente Antônio Carlos, 6627, Pampulha, Belo Horizonte - MG – 31270-901, Brazil; Tel: +55 31 3409-2426; E-mail:

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