title: Two-couple orthodontic appliance systems: activations in the transverse dimension.
abstract: Partially bracketed arch wires can be activated in the transverse dimension to produce first-order rotations of the molars and constriction or expansion of intermolar width. A 2 x 6 arch wire is ideal for such activations because of the minimal side effects to the anterior teeth. As with other two-couple orthodontic appliance systems, symmetrical V-bends, asymmetrical V-bends and step bends are used to generate moments of the couples whose associated equilibrium forces can be used to produce desired tooth movement.
authors.affiliation: Department of Orthodontics, Virginia Commonwealth University, Richmond 23298-0566, USA.
authors.forename: J
authors.initials: J
authors.lastname: Rebellato
mesh_terms: D003481:Cuspid; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D010347:Patient Care Planning; D014087:Tooth Movement Techniques / Q000295:instrumentation*