Functional Appliances - Twin Block

Article Index Functional Appliances Bionator Twin Block Frankel Herbst All Pages Page 3 of 5 The Twin Block incorporates the use of upper and lower bite blocks to position the mandible forward for  Class II correction. The basic appliances are separate upper and lower plates. The upper plate includes an expansion screw for lateral development and occlusal pads to cover the molars. The lower plate includes occlusal pads to cover the lower bicuspids. These plates interface at 70 degree angles to lock in the desired forward position of the mandible.  The Twin Block   << Prev - Next >>