| 摘要 |
An orthodontic device comprises a face bow member which includes generally diverging outer arms adapted for connection to an orthodontic headpiece and inner arms extending between the outer arms and adapted to project into the mouth of the user. A stem member is rotationally connected with each of the inner arms and is biased toward a given rotational position. An annular collar adapted for engagement with a tooth is removably connected on each of the stem members so that rotation of each stem member is transmitted into arcuate movement of the associated collar. When the collars are engaged on the teeth, the stem members are each located out of their normally biased position, so that the biasing force serves to arcuately move the collar. In use, the device applies a linear force to the body of the tooth to move the tooth toward the back of the mouth and another linear force to the body of a tooth to tip the crown of the tooth relative to the root while simultaneously applying a rotational force to the body of the tooth by virtue of the arcuate movement of the collars in response to the biasing force to also tip the root of the tooth in the same direction as the crown.
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