Análise de Prescrições Ortodônticas em Molares com Torques Ideais – Estudo Laboratorial

Abstract

INTRODUCTION: There is a diversity of prescriptions of orthodontic appliances that the orthodontist has available to use his clinical practice. Also, there is a lack of evidence regarding the effect of insertion of rectangular strands into orthodontic molar tubes on the final positioning of these teeth when different prescriptions are used. Therefore, this study had the objective of analyzing whether the torque present in the tubes of the pre-adjusted devices of different prescriptions would alter the ideal inclination of the first and second lower and upper molars. METHODS: The sample consisted of gypsum models of 30 patients who presented ideal torques. Tubes with 0.22x0.028 "slot of four prescriptions were used: MBT, Roth, Damon and Edgewise. The tubes were glued on the plaster model, in the center of the clinical crown of each tooth, vestibular face. In addition to this gluing position, the position of one millimeter below the center of the crown was evaluated in the lower models. The gap between the steel rectangular wires (0.019x0.025 "and 0.021x0.025") and the tubes was measured to verify if the initial torque was maintained, and the effective torque was quantified. CONCLUSIONS: In the 0.019 wire x0.025 "there were higher number of optimum torque maintenance, regardless of the prescription tested, when compared to 0.021x0.025" wire. The Roth prescription obtained the closest results to zero in the evaluation of the effective torque, indicating a small average torque change.