Lingual arch

A palatal (from Latin palatum " palate ", Syn. Engl TPA of transpalatal arch ) is a stuck treatment device in orthodontics. The palatal arch consists of a wire bracket which is fastened by straps to the large back teeth ( molars ). The arch runs across the palate and is soldered usually with the bands or welded.

Function

The main function of the palatal arch is the anchor of the molars. This is achieved by several mechanisms: Firstly, the distance between the two fixing teeth is fixed to each other. Drifting of the teeth mesial is prevented that the dental arch "front" is narrower. Second, the tongue pushes the bow with each swallow against the palate. This intrusive ( imprinting ) movement also prevents the mesial drift. If the anchoring teeth are actually to be intruded, the sheet can be designed so that it lies within 5-7 mm of the palate. In this way, the tongue pressure gets more action. In addition, the sheet can be displaced as far as possible distally. This is known as distalexzentrisch. With this design, a tilting of the anchor teeth is prevented or tilted teeth can be straightened. Clinical studies have shown, however, that a palatal arch is to be regarded merely as an anchorage reinforcement. Despite the use of a palatal arch to be reckoned with anchorage loss. A palatal arch can be combined with a headgear.

Variants

• Nance plate: To achieve a better anchoring effect, the palatal arch can be combined with a Nance plate. This thumbnail- large plate supported on the falling portion of the hard palate and thus acts also movement of the anchor teeth mesially contrary.
• Goshgarian: If the distance between the anchoring teeth are not only maintained but can be enlarged ( expansion), an arc with a central loop is employed. Frequently this arc is not soldered to the bands, but sits on the removable straps. This allows the loop to be activated.