The incline of the upper guards contacts the inclined plateau of the lower plate and results in a protrusion of the mandible
The double bite jumping plate with preformed guards and integrated screws in the upper and lower jaw The result of the incline of the upper guards contacting the inclined plateau of the lower plate is a protrusion of the mandible. The models are mounted in the fixator according to a construction bite and the retention elements are bent according to the design. The mandibular plate is totally finished. The acrylic plateau in the incisor area is designed 1 mm over the incisal edges. Following the plateau an inclined plane of 60° in relation to the occlusal plane is added as a gliding surface for the guards.
Preformed mandibular expansion screws for double plates can be used when screws are integrated into the double plates. The screw with holder and mounting pattern for the adjustment of the incline is adapted on the lower plaster model, then the acrylic is added and the appliance is finished.
First, the plateau of the finished mandibular plate is covered with a very thin layer of wax and then, the preformed maxillary expansion screw with guards is fixed. After that, the acrylic is scattered on the maxillary plate and both parts of the fixator are set together carefully. Acrylic can be added to the maxillary plate if the expansion screw is not covered adequately.
