The wax "working bite" prior to functional appliance construction is made primary with the intention of

Mechanism of action of working bite: Displaces mandible from its rest position causing stretching of the muscles attached to mandible. The reflex activity tends to restore mandible to a postural position that was determined by the unstretched muscles. Most construction or working bites are taken at a vertical dimension beyond freeway space. This increases vertical dimension and also displace the mandible in the sagittal and transverse planes.