Palatal arch

Palatal arch on a working model

A palatal arch (from Latin palatum " palate ", Syn: TPA from English T rans p alatal a rch) is a fixed treatment device in orthodontics . The palatal arch consists of a wire bracket which by means of straps to the large jaw teeth ( molars is attached). The arch runs across the roof of the mouth and is usually soldered or welded to the ligaments.

function

The main function of the palatal arch is to anchor the molars. This is done through several mechanisms: On the one hand, the distance between the two fastening teeth is fixed. A drifting of the teeth in a mesial direction is prevented by the fact that the dental arch is narrower "at the front". On the other hand, the tongue presses the arch against the roof of the mouth with every swallowing process . This intruding (pressing) movement also prevents mesial drift. If the anchor teeth are actually to be intruded, the arch can be designed so that it is 5-7 mm from the roof of the mouth. This way, the tongue pressure gets more effective. In addition, the arch can be moved as far distally as possiblebe relocated. This is called distal eccentric. This design prevents the anchoring teeth from tilting, or tilted teeth can be straightened. Clinical studies have shown, however, that a palatal arch can only be viewed as an anchorage reinforcement. Despite the use of a palatal arch, loss of anchorage must be expected. 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 plate, about the size of a thumbnail, is supported on the sloping part of the hard palate and thus also counteracts any movement of the anchoring teeth in the mesial direction.
• Goshgarian : If the distance between the anchoring teeth is not only to be maintained, but also increased (expansion), an arch with a central loop is used. Often this bow is not soldered to the ribbons, but sits detachably on the ribbons. This enables the sling to be activated.

Individual evidence

1. ↑ Bengt Mohlin, Marie Follin Catharina Hagberg: ortodonti. Gothia Förlag, 2008, ISBN 978-91-7205-589-6 , p. 164ff.
2. ^ G. Fiorelli, B. Melsen, R. Giorgetti: Biomechanical fundamentals in the use of the transpalatal arch and the ligual arch. PMID 2074877
3. ↑ I. Feldman, L. Bonde Mark: Anchorage capacity of osseointegrated and Conventional anchorage systems: a randomized controlled trial. PMID 18331927 .
4. ^ WR Proffit ao: Contemporary Orthodontics 4th edition. Mosby Elsevier, 2007, ISBN 978-0-323-04046-4 , pp. 474-476.

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