The Balters Bionators are the original Bionator designs. Their base of operation is the acrylic that is lingual to the dentition. This particular appliance is designed to open a closed bite in Class I and Class II malocclusions, and to correct Class II skeletal relationships. To accomplish this, the lower anterior teeth are covered with acrylic to act as a bite plane, hold the bite open, and prevent anterior super-eruption. An extended labial bow acts as a buccal shield to keep the buccal musculature away from the posterior teeth. Controlling these muscles encourages eruption. The lingual acrylic prevents the tongue from interposing in the inter-occlusal space. Upon delivery of the appliance, the posterior acrylic is carefully ground-in to permit controlled eruption of the molars and bicuspids until the closed bite is corrected.