In orthodontics, the "ABC apparatus" is a treatment device for simultaneous dental treatment of the teeth in the dentition of the upper and lower jaw. The appliance serves to ensure correct occlusion, as the jaw and the periodontium form a unit for anchoring the teeth in the jawbone.
In dentistry, the ABC apparatus is an orthodontic treatment device for simultaneous adjustment of the correct bite with "intermaxillary elastics" of the upper and lower jaw. ABC contacts are the localization of antagonist contacts, which are essential for stable occlusion in the posterior region.
Antagonists are dental antagonists of the teeth in the upper and lower jaw. Elongated teeth" are elongated teeth which are formed reactively by a missing opposing tooth or the antagonist.