| 摘要 |
An orthodontic appliance for use with a bracket having a pin opening and an arch wire slot, which comprises an uprighting spring and a pin coacting to lock one or more arch wires to the bracket and to apply an uprighting force to the tooth on which the bracket is mounted. The appliance includes a pin having a head, which coacts with the coil of the uprighting spring wherein the tail of the pin and the tail of the spring are received in the pin opening and the arch wire slot is closed such that free tipping between the arch wire and bracket is possible. The lever arm of the spring terminates in a hook for engaging with the arch wire and the coil of the spring is positioned at the bracket.
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