| 摘要 |
An orthodontic appliance has a base portion having formed on one side thereof a tooth-abutting surface and a bracket portion defining an archwire slot therein. Two tie-wings project outwardly from the bracket portion and extend along one side of the archwire slot. Two hooked tie-wings extend along the other side of the archwire slot and project outwardly therefrom. Each hooked tie-wing defines on an interior side thereof a hook-shaped surface. The hook-shaped surfaces are provided for mounting auxiliary force transmitting members thereto.
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