ARCH FORMS IN ORTHODONTICS The achievement of a stable, functional, and esthetic arch form has long been one of the prime objectives of orthodontics. A key aspect in achieving this goal is the identification of a suitable arch form to be use in the course of treatment. Many clinicians tend to adopt one particular arch form for the treatment of all kinds of malocclusions. The arch form chosen is often the one that creates in the orthodontist's opinion, the optimum esthetic, and functional occlusion.