Orthodontic bracket with rotary ligating cover
The present invention provides designs for a self-ligating orthodontic bracket. The self-ligating orthodontic bracket includes a mounting base for attachment to a tooth surface, an archwire slot, a rotary ligating cover permitting access to the archwire slot, and one or more locking features for holding the rotary ligating cover in a closed position. In one embodiment, the bracket includes one or more locking tabs on the rotary ligating cover aligned in coplanar relation to and cooperatively mating with cutout portions in the base. In one embodiment, the bracket includes at least one resilient retention mechanism which may include one or more relief channels permitting flexing of at least portions of the rotary ligating cover adjacent to the one or more locking tabs.
1. A self-ligating orthodontic bracket having:
a) a mounting base for attachment to a tooth surface;
b) an archwire slot formed upon said base and sized for receiving an orthodontic archwire; and
c) a rotary ligating cover selectively rotatable within a plane of rotation between an open position permitting access to said archwire slot and a closed position covering said archwire slot, said rotary ligating cover rotatable about an axis that is oriented perpendicular to said tooth surface and transverse to said plane of rotation; and
(d) one or more locking tabs disposed on said rotary ligating cover for holding said rotary ligating cover in said closed position, said one or more locking tabs aligned in coplanar relation to said rotary ligating cover and said plane of rotation, said one or more locking tabs oriented across said archwire slot from said axis of rotation when said rotary ligating cover is in said closed position,
(e) wherein said at least one locking tab comprises a resilient portion of said rotary ligating cover adapted to flex inwardly toward said axis of rotation and having a protruding surface engageable by a depression in said mounting base.
2. The bracket of claim 1 , further comprising a pair of tie wings extending from said base and defining said archwire slot between said tie wings.
3. The bracket of claim 2 , wherein said rotary ligating cover is rotatable about an axial member comprising a retaining pin insertable into a hole in said base for rotatably fastening said cover to said base, said hole being sized for receiving said retaining pin.
4. The bracket of claim 3 , further including a bushing formed upon said base.
5. The bracket of claim 2 , wherein said axial member comprises a stud formed upon said base and coined to rotatably fasten said cover to said base.
6. The bracket of claim 1 , wherein said resilient portion of said rotary ligating cover comprises a channel journalled in said cover inwardly of said locking tab to permit said tab to flex toward said axis of rotation.