Orthodontic bracket
An orthodontic bracket mountable on a tooth for use in retraction mechanics to facilitate movement of teeth along an arch, which includes an archwire-receiving member rotatably mounted on a base and structured to freely rotate when tipping a tooth during sliding of the bracket along an archwire thereby minimizing friction between the archwire and bracket to significantly decrease the required retraction force, and treatment time, thereby minimizing the possibility of root resorption and maintaining the integrity of the root and surrounding bone. A locking pin for locking the member against rotation is employed when uprighting the tooth from a tipped position.
1. An orthodontic bracket mountable on a tooth and adapted to receive an archwire for obtaining corrective movement to the tooth comprising:
a base adapted to be mounted to the surface of a tooth;
a body mounted for rotatable movement with respect to said base and having an archwire receiving slot, the body having a central aperture below the archwire slot, the central aperture having wall portions including a curved arc portion and a straight wall portion;
an axle inserted through said aperture into the base, said axle having a bearing portion adapted to engage said wall portions of said central aperture, said axle having a curved arc bearing surface and a flat surface; and
a pin insertable into said aperture between said flat surface of said axle and said straight wall portion of said body to lock said body into a fixed rotary position relative to said base.