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Abstract

A new expansion complex is provided for a mandibular and maxillary arch expander. The arch expander includes first and second forward orthodontic bands and a pair of rear orthodontic bands operatively connected to the forward orthodontic bands. The expansion complex includes an arm extending lingually from a lingual side of the first forward orthodontic band. An expander body is rotationally mounted on the arm to rotate about the arm. A passage extends through the body, and the arm extends into a rear end of the passage. The body passage is internally threaded near the front of the body. An expansion rod is mounted to a lingual side of the second forward orthodontic band. The expansion rod is externally threaded at a rear end thereof to be threadedly received in the threaded portion of the body passage. The expansion rod has a bore extending forwardly from the rear end of the rod which receives the arm. The back end of the body passage can be counterbored to receive a coil spring which is journaled about the arm.

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First Claim