| 摘要 |
The invention relates to an orthodontic expansion screw for the generation of an expansion force between a first and a second fastening elements, for the fastening to oppositely lying sides of the upper jaw, and an adjusting element connected with the fastening elements for the alteration of the mutual spacing of the fastening element. The invention is characterized in that each fastening element has at least two mounting wires with at least three free ends of the anchoring of teeth of the upper jaw.
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