Torque expression of self-ligating brackets

Study of the Relationship of Smile Esthetics Between Torque and Dental Arch Width of Posterior Teeth in Orthodontics

“…As showed in Zachrisson [5,6] research, a neutral posterior torque should be achieved, as it is a key factor for smile and face aesthetics. In accordance with the conclusions in the works of Zachrisson [5] and Badawi et al [9], a negative torque in posterior sectors gives a compression appearance to the maxillary arch, as the crown inclination of this posterior superior area is a key factor for a bright and full smile [6].…”

“…It is known that expression of the torque is achieved by filling the slot of the bracket and progressively increasing the size of the wires during treatment (wires sequence) [9]. In this study, all cases were applied a progressive increase in the sequence of archwires used during treatment.…”

“…As Zachrisson [6] said, torque control is one of the weaknesses of the preadjusted bracket systems [6]. And, as many authors have suggested, the expression of torque is the result of interaction of many factors [9,11,24]. In this research, variables, such as individual biological variation, the deformation of the slot of the bracket during treatment, the amount of resin between the bracket base and the tooth, possible defects in wires and brackets or the starting torque of the posterior teeth, could not be controlled.…”

Comparison of Torquing Ability of 0.019” × 0.025” Nickel Titanium and Fiber Composite Archwires -A Cone Beam Computed Tomography Study

“…2016; 11(2):e5967. (28)(29)(30)(31)(32)(33)(34), none of the studies took into account the curved section of the arch as simulation models were done using straight pieces of wire. In the absence of in-vivo studies, extrapolating, the result so obtained, to various clinical settings may not be accurate for any given bracket and archwire combination.…”

Self-Ligating Brackets: An Overview

“…Passively ligated brackets produce less frictional resistance; however, this decreased friction may result in decreased control compared with actively ligated systems. Badawi et al, 2008, measured the torque expressed from two passive (Damon 2 and SmartClip) and two active (In-Ovation and Speed) self-ligating orthodontic brackets. Results showed that active self-ligating brackets demonstrated better torque control due to their active clip forcing the wire into the bracket slot.…”