Vol. 13 – Number 49 – 2020 Original Article Page 86-95 Orthodontic Nickel-Titanium wires load deflection study: addressing pseudoelasticity and influence of the standard deviation Renata Sathler1 Marcos Roberto de Freitas2 Thais Maria Freire Fernandes3 Olga Benário Vieira Maranhão4 Daniela Gamba Garib5 Guilherme Janson6 Abstract Proposition: The purpose of this study is to check the pseudoelasticity phenomena on nickel-titanium orthodontic wires, used to treat dental crowding. Methods: Eleven groups of nickel-titanium orthodontic wires, caliber 0.36mm (0.014”) of 6 different brands (Abzil conventional and heat-activated; GAC conventional and heat-activated; Morelli conventional and heat-activated; Ormco CuNiTi; Orthometric conventional and heat-activated and Orthosource conventional and heat-activated) were tested by bend testing, at deflections of 0.5mm, 1mm, 2mm and 3 mm. A universal testing machine INSTRON 3342 with a 10N load cell was used and, in order to standardize the tests, the ISO 15.841 regulation was followed. Statistical analysis was performed using the subsequent tests: Kolmogorov-Smirnov to verify normality and ANOVA followed by Tukey test for intergroup comparisons. Results: All groups were classified as pseudoelastic, within a range of maximum. force of 40cN. Conclusions: Among these groups those that presented pseudoelasticity and excellent homogeneity were Morelli heat-activated and Ormco CuNiTi. Descriptors: Orthodontic wires, Orthodontics, corrective Orthodontics. 1 Orthodontist at the Hospital for Rehabilitation of Craniofacial Anomalies – USP. 2 Professor of Orthodontics – FOB-USP 3 Professor, Department of Orthodontics, University of Northern Paraná. 4 MSc and PhD student in Orthodontics – FOB-USP. 5 Associate Professor of Orthodontics, Bauru School of Dentistry and Rehabilitation Hospital for Craniofacial Anomalies – USP. 6 Full Professor of Orthodontics and Vice-Director of the Bauru School of Dentistry – Substitute Superintendent of the Rehabilitation Hospital of Craniofacial Anomalies – USP.
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