This Sagittal appliance is designed to move the pre-maxillary segment labially to regain lost cuspid space. Frankel pads have been added to eliminate lip pressure on the anteriors and facilitate alveolar development of the maxilla. Holding the upper lip forward creates the tension needed to stimulate the periosteum over the maxillary labial plate. Note: Many clinicians prefer to add occlusal coverage to these appliances to aid in retention. Occlusal coverage can also be indexed heavily to take advantage of inter-arch anchorage.