Assessment of aesthetic bracket torque in the roth prescription

Currently, metallic and aesthetic brackets can be found on the market in various prescriptions, with Roth's being the most used. The present study aimed to analyze whether the torque values ​​of the esthetic brackets of the Roth Technique are in accordance with the values ​​prescribed by the authors of the technique. A total of 160 esthetic brackets, Morelli and Orthometric (Brazilian), were evaluated using the Torque Real technique, with 0.022" slots and torque at the base, divided into groups: Central Incisor Morelli, Lateral Incisor Morelli, Central Incisor Orthometric, Lateral Incisor Orthometric, Upper Canine Morelli, Orthometric upper canine, Morelli lower canine and Orthometric lower canine. The pieces were glued on a wooden template, later scanned by Optical Microscopy, and the torque angle analyzed in ImageJ® software. The data were tabulated and compared between them and with the torque values ​​of the Roth prescription. The measured torque values ​​were submitted to the Student t-test or the Mann-Whitney test to compare the experimental groups to the Roth prescription values. There were significant differences between the brands and the recommended technique. It is concluded that the brackets analyzed have torque angles different from each other and also different from those recommended by Roth.