Case report: modified use of the Jasper Jumper appliance in a skeletal Class II mixed dentition case requiring palatal expansion.

The Jasper Jumper appliance provides a method of Class II correction with an active force component that the patient cannot remove. A modification of classic Jasper Jumper usage is illustrated in a mixed dentition case where full banding is impractical. This report shows how Jasper Jumper springs can be attached to a fixed maxillary expansion appliance and a lower lingual holding arch for correction of a Class II malocclusion. Cephalometric analysis revealed that despite seemingly adequate anchorage for the springs, treatment changes were largely dentoalveolar, with minimal improvement in the underlying skeletal structures. Some restraint of maxillary growth was found, but most of the overjet correction was due to forward movement of the mandibular dentoalveolar complex and retraction of the maxillary dentoalveolar complex.