An orthodontic appliance has sliding rods for the treatment of a lower jaw that is offset relative to the upper jaw. A sleeve is inserted between opposite ends of the tow rods, each of which being associated with one of the jaws. The second rod is screwed into the sleeve at one end, while the first rod is slidably mounted in the sleeve at the opposite end, with the adjustment of the position of the second rod relative to the sleeve being made by screwing and unscrewing.
