The new Williams appliance makes Class II treatment really easy. The unique threading design allows for incremental advancements of the mandible. A key is placed in the holes built into the tube thus allowing for chairside activation and advancement of the mandible.
No shims, no removal of the appliance, no disengagement needed, just turn the key!
*Invented by Dr. Michael Williams, Gulfport, Mississippi US patent no. 5,919,042. Mexican Patents no. 1999527 and 224167 other international patents.