Full palatal coverage with ZERO teeth contact. I believe that skeletal expansion in adults is only feasible if the force is directly applied on the maxilla.
Headgear component used to deliver the upwards force on the appliance.
Headgear component used to deliver the horizontal force. On this picture, there is 500g of forward force applied on the palate with no reciprocal on the mandible.
Final setup of the headgear, used to deliver high forces directly to the maxilla. This version is light enough to sleep with, and can be worn for 8-hour periods comfortably.