Dentistry – Orthodontics – Bracket
Patent
1995-12-06
1997-11-11
O'Connor, Cary E.
Dentistry
Orthodontics
Bracket
A61C 700
Patent
active
056857110
ABSTRACT:
An orthodontic bracket comprises a bracket body with a mesial distal extending arch wire slot and a two-armed ligating latch spring member mounted thereon. The two arms comprise a ligating inner portion and a latching outer portion joined by a connecting portion and the spring member is movable between an unlatched slot open position and a latched slot closed position in which the slot is closed by the ligating portion and the spring member is latched to the bracket body by the latching portion. The bracket body may be made as two mirror image parts between which the spring member is mounted, the two body parts thereafter being fastened together. Each body part may carry a cylindrical mesial distal extending pivot post, the spring member being mounted on the posts for pivoting movement relative to the bracket body, the posts and spring member being frictionally engaged as it moves between slot open and closed positions for frictional damping of the pivoting movement. The latches between the spring member and the bracket body may comprise notches in the spring edges that are engaged by latch sears on the body, and preferably the latch sears have cam acting labial faces producing gingival movement until the latches are engaged. Preferably the spring member is made of a nickel titanium shape memory alloy. The bracket body may have one or two hook members for attachment of a traction spring member. It may instead have two pairs of tie wings for reception of an external ligature between which the spring member is disposed.
REFERENCES:
patent: 3871096 (1975-03-01), Walshein
patent: 4144642 (1979-03-01), Wallshein
patent: 4725229 (1988-02-01), Miller
patent: 5059119 (1991-10-01), Snead
patent: 5094614 (1992-03-01), Wildman
patent: 5516284 (1996-05-01), Wildman
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