The functional orthodontic-orthopedic VDP appliance (Vorschubdoppelplatte, Bite jumping appliance, Sander II). Literature review and typical clinical case presentation.

This paper describes the indications and action mechanisms of the functional orthodontic-orthopedic VDP appliance (Vorschubdoppelplatte, Bite jumping appliance, Sander II) on the basis of modern literature. Special emphasis is placed on comparing the VDP appliance results to those of other functional orthodontic appliances. Furthermore, a typical clinical case where the VDP appliance was used is presented. The effects of this appliance on the dentoskeletal system are mainly of skeletal nature and concern both enhancement of mandibular growth and inhibition of forward maxillary growth. Application of the VDP appliance is overall superior to all other functional orthodontic-orthopedic appliances described in the literature, as it has a combined action on both sagittal and transverse dimensions of the craniofacial complex, while it also controls the vertical facial dimension. Furthermore, depending on individual clinical characteristics, the main functional orthodontic-orthopedic action of the appliance may be combined with simultaneous treatment of problems in groups of teeth, using various components incorporated in the two appliances that constitute the VDP. The appliance maintains its action during sleep, as its arm-guides do not allow disassembling of the two appliances at the normal mandibular opening position. Application of the VDP appliance is indicated in many cases of skeletal Class II malocclusion.