Ortho Organizers, Inc.

Ortho Corporation

Chhattar S Kucheria

Stephen M Huff

Lindsay W Brehm

The orthodontic appliance is metal injection molded as a unitary bracket, and is a made of a Stellite cobalt chromium alloy composition formulated to be substantially nickel-free, containing less than 1% nickel, in order to alleviate nickel allergic reactions experienced by a small fraction of the population to nickel. While nickel improved hardness of the bracket, the elements of chromium and molybdenum in the proposed alloy for the bracket also contribute to hardness of the alloy. The orthodontic bracket comprises a unitary metal injection molded body including a bonding base adapted to adhere to a tooth surface, and an archwire slot adapted for receiving an archwire. The preferred composition consists essentially of 59-69% by weight cobalt, 26-30% by weight chromium, 4-8% by weight molybdenum, and 2% or less by weight trace elements. The bonding base has a bottom base pattern in the form of a plurality of rectangular or square pockets that are approximately 0.005 to 0.015 inch in size. In another embodiment, the orthodontic appliance can also have a facebow tube, a primary archwire slot, and an auxiliary archwire slot. In another currently preferred aspect, the primary archwire slot includes an auxiliary archwire slot, and tiewings. The tube can have a round aperture for receiving a cylindrical wire, or a rectangular aperture for receiving an archwire.

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San Diego, CA, United States of America

Chhattar S Kucheria