It does not require wires or rubber to tie or lock the brackets permanently because it has a "trap-door" device which stays in place together with the Ni-Ti wire. This "trap-door" mechanism loosely holds the brackets and the wire together but with minimal movement and stable tooth manipulation.
Orthodontists prefer this type of treatment today because it requires lesser clinic appointments but with excellent occlusion improvements within weeks or months depending on the case. It also allows the patient to suffer less with having to have the elastics changed from time to time as this doesn't need any.
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