The achievement of a stable, functional, and esthetic arch form has long been one of the prime objectives of orthodontics, since the time of Edward Angle. A key aspect in the achievement of this goal is the identification of a suitable arch form to use in the treatment of each case. Many clinicians tend to adopt one particular arch form for the treatment of all malocclusions. The arch form chosen is often the one that creates, in the orthodontist's opinion, the optimum esthetic and functional occlusion.