Importance

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Abstract

Expansion screw for tooth adjustment having two expansion screw body members each embeddable in a plastic palate plate, these body members being provided with retention grooves for anchoring in the plastic of these palate plates, also having a threaded spindle and two guide pins, wherein the threaded spindle has spindle sections with opposite threads on either side of a central section, these spindle sections engaging in corresponding threaded bores of the expansion screw body members, and wherein the latter have guide openings for the passage of the guide pins extending parallel to the threaded spindle. In order to reduce the size of the two expansion screw body members, the latter are of a hat-shaped design in the side view and provided at their central regions with retention grooves and, in addition, at their facing inner end faces with recesses for accommodating the central section of the threaded spindle, these recesses being designed such that these end faces can abut on one another when the threaded spindle is turned and that in this state of the expansion screw the central section of the threaded spindle provided with a tool attachment point is accessible from the outside.

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First Claim