Intraoral dental appliance to correct retrusive mandibles orthopedically in the treatment of Class II malocclusions

Intraoral appliances for producing a forward force on the mandible of a person having retrusive mandible and lower occlusion, comprising two pairs of hinged, semi-collapsible two-bar linkages, one in each side of the mouth, each pivotably anchored through mounting blocks with are pre-positioned and cemented to bands on teeth functioning as the lower and upper first molars, said linkages having freedom of movement along a prescribed arc when the mouth is initially closing, freedom of movement laterally when side to side jaw movement occurs and a toggle action near closure, permitting closure forces to develop a horizontal force vector along the mandible to correct its retrusion and a spring bias to maximize the duration of corrective forces by maintaining them during periods when the wearer of the appliance is relaxed as, for example, during sleep.

Intraoral appliances for producing a forward and corrective force on the lower jaws of persons having retrusive mandibles comprising:

• upper and lower hinged blocks movably connected to bands cemented to upper and lower teeth, links extending from said upper hinged blocks and terminating at pivotably mounted cylinders, threaded fixtures rotatably attached to said lower hinged blocks and mating with partially-threaded pistons the unthreaded portions of which extend into the other end of said cylinders, whereby fine adjustment of the allowed piston-travel distance into the cylinder can be made by turning and locking the threaded portion of said partially-threaded piston within said threaded fixture thus altering the amount of corrective force applied to the mandible.