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Year : 2020  |  Volume : 10  |  Issue : 1  |  Page : 29-34

Elastic deflection study of nickel-titanium orthodontic wires: 3-point bending test X clinical simulation device

1 Department of Dentistry, Hospital for Rehabilitation of Craniofacial Anomalies, São Paulo, Brazil
2 Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil
3 Department of Mechanical Engineering, Faculty of Engineering, Universidade Estadual Paulista Júlio De Mesquita Filho, São Paulo, Brazil
4 Department of Orthodontics, University of North Parana, Parana, Brazil

Correspondence Address:
Dr. Renata Sathler
Hospital for Rehabilitation of Craniofacial Anomalies, R. Silvio Marchione, 3 20, Vila Universitaria, Bauru, Sao Paulo 17012-900
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jid.jid_78_18

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Introduction: The purpose of this study was to compare the most usual types of bending tests used to evaluate nickel-titanium orthodontic wires: the 3-point bending test and the clinical simulation device (CSD). Materials and Methods: Eleven groups of 0.014-inch nickel-titanium orthodontic wires of six different brands were tested. A 3342 Instron universal testing machine with a 10 N load cell was used, and the ISO 15.841 regulation was followed. T-tests were used to compare the evaluations. Results: At a deflection of 0.5 mm, the device released significantly lighter forces then the 3-point test. However, at deflections of 1; 2 and 3 mm, the device released significantly heavier forces. Conclusion: Because of the several differences between the tests and the inconsistency of the CSD, the 3-point bending test was elected the most reliable method to evaluate the elastic deflection of nickel-titanium orthodontic wires.

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