Labial bow 0.8 mm spring hard, Adams clasp with spring for extraoral traction 0.8 mm spring hard, ball clasp 1.0 mm spring hard, Adams clasp 0.7 mm hard
Function:
Correction of mandibular retrognathism
Description:
The mandibular position is determined with a construction bite and is fixed through inclined bite planes
In the upper plate the labial bow is passed between the second premolar and the first molar into the acrylic base. The Adams clasp is bent over two teeth, including a spring in the centre to anchor the headgear. The lower plate only includes ball clasps in the anterior region and Adams clasps in the posterior region.
First, the lower plate is finished. It includes a small bite block in the premolar area which is sloped distally. In the upper plate the bite block is sloped in the opposite direction and therefore fits exactly onto its counterpart.
Through these two inclined planes the occlusion is fixed and the mandible is determined in its position.
