Abstract: The appliance includes a first member and a second member, with the second member being free of a permanent connection with the first member. The first member has an abutment/obstruction element including an abutment surface and an obstruction surface, and a mounting element for mounting the first member to a tooth on one of the maxillary or mandibular jaws. The second member has a buccally extending projection and a mounting member for mounting the second member to a tooth on the other one of the maxillary or mandibular jaws. The first and second members are mounted on the teeth so as to place the obstruction surface in generally vertical alignment with the buccally extending projection when the mandibular jaw is in its uncorrected position. This orientation causes the obstruction surface and buccally extending projection to strike one another when the patient attempts to close the mandibular and maxillary jaws with the mandibular jaw in its uncorrected position.

Abstract: An improved orthodontic appliance of the type generally referred to as headgear, for applying a force to a tooth to move the tooth bodily and/or rotationally, and for pushing outward the cheek to encourage spontaneous jaw growth. The appliance comprises an outer bow intended to be retained adjacent the user's face by a neck strap and an inner bow attached to the outer bow intended to fit within the user's mouth proximate to his cheeks. The inner bow includes left and right activating arms, which arms include shoulder portions to push the cheeks outwardly, and which arms also include noncircular engagement means adapted to fit snugly within tubes fixed to a left and a right rear tooth. The activating arms are formable and sufficiently resilient that they can be selectively deformed to apply a force to the teeth to achieve the desired movement.