Comparison of torque expression between aesthetic and conventional nickel wires

Vol. 16 – Number 62 – 2023 Na Visão D’elas Page 97-105 Comparison of torque expression between aesthetic and conventional nickel wires Leniana Santos Neves1 Isadora de Oliveira Silvares2 Rodrigo Hermont Cançado1 Vicente Tadeu Lopes Buono3 Esdras de Campos França4 Abstract The purpose of this study was to compare the torque magnitude of aesthetic and conventional nickel titanium (NiTi) rectangular wires subjected to torsion tests. Commercial esthetic and conventional pre-contoured NiTi wires from 4 brands (American Orthodontics, Eurodonto, Orthometric, and TP Orthodontics) with a cross-section of 0.016” x 0.022” were tested. The tests were carried out in a torsion machine with rotation from 0º to 90° and the behavior in deactivation at 20° and at a maximum torque at 90° was analyzed. At 20° in unloading, American Orthodontics esthetic and conventional wires had higher torque, while conventional Eurodonto and TP Orthodontics esthetic wires had lower torque. At maximum torque (90°), the wires that had the highest torque were conventional TP Orthodontics and aesthetic American Orthodontics, and the wires with the lowest torque were conventional Eurodonto and aesthetic Orthometric. No statistically significant differences were found when the aesthetic threads were compared to each other. When comparing aesthetic and conventional wires from the same brand, the only one that showed a statistically significant difference was Eurodonto. It was concluded that, when comparing the torques of the aesthetic and conventional wires of the same brand, no statistically significant differences were found, except for the Eurodonto brand, which presented lower torque for the conventional wires. Descriptors: Aesthetic orthodontic wires, torsion, nickel titanium. 1 MSc and PhD in Orthodontics – FOB-USP, Adjunct Professor, Department of Restorative Dentistry – Area of ​​Orthodontics – Faculty of Dentistry UFMG. 2 Specialist in Orthodontics – UFMG. 3 Master in Theoretical Physics – Katholieke Universiteit Leuven – Belgium, PhD in Metallurgical and Mining Engineering – UFMG, Full Professor at the Department of Metallurgical and Materials Engineering at the School of Engineering – UFMG. 4 MSc and PhD in Dentistry – UFMG, Substitute Professor, Department of Restorative Dentistry – Areas of Orthodontics and Dental Materials – Faculty of Dentistry – UFMG. DOI: 10.24077/2023;1662-d027323785