Dentistry – Orthodontics – Bracket
Patent
1997-10-27
1999-03-23
Lewis, Ralph A.
Dentistry
Orthodontics
Bracket
433 15, A61C 300
Patent
active
058850740
ABSTRACT:
A ligature for an orthodontic appliance comprising a coil spring hoop of helically wound metal strip or wire or a wave spring hoop of wave wound metal strip or wire, preferably of shape memory metal. Such a metal ligature is simpler and more convenient to use than wire ties and has a life considerably longer than the elastomeric ligatures currently in use; because of this extended life they can be permanently attached to a bracket body to provide a self-ligating bracket. A coil wound ligature has the form of a hoop and is attached to the bracket body via a U-shaped core member threaded through part of the hoop and having its ends fastened to the bracket body. The ligature may have the form of a loop having its ends inserted in respective bores in the bracket body. The ligature may comprise an attachment part by which it is attached to the bracket body and a loop retainer part engageable over a bracket tie wing, the attachment and retainer parts being connected together by two mesially-distally spaced wave wound spring parts.
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