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The trade name for an orthodontic technique using a succession of clear plastic arch aligners, similar to bleaching trays, which fit over all the surfaces of the teeth and which are designed to move the teeth in a controlled and predetermined direction. Each aligner is constructed to move the teeth 0.25–0.3mm and is changed on a two-weekly basis. The technique has the advantages of ideal aesthetics, improved oral hygiene, and good ease of use and comfort for the patient; the disadvantages include poor control over root movements, a lack of operator control, and an unsuitability for use in anterior–posterior discrepancies greater than 2mm.

Subjects: Dentistry.

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