A practical introduction to fixed appliances. The straightwire appliance. 1: Design principles

The straightwire appliance, by the refinements of its design, has revolutionized fixed-appliance orthodontics. Treatment is facilitated by the use of many preformed components and the use of unsightly and troublesome auxiliary springs is largely removed. However, the straightwire appliance is a precision instrument and must be used precisely, or the results of treatment will be seriously compromised. This is the first of two articles, in which the design principles and clinical management of the straightwire appliance (in one dental arch only) will be considered.