AIM: The aim of this study was to evaluate the skeletal and dentoalveolar effects of the Class II malocclusion treatment with the Jasper Jumper appliance associated with fixed orthodontic appliances, compared to an untreated control group. METHODS: The sample comprised 47 subjects, divided into two groups: Group 1, with 25 patients at a mean age of 12.72 years, treated with the Jasper Jumper appliance for a mean period of 2.15 years; Group 2 (Control), including 22 subjects at a mean age of 12.67 years, who were not submitted to orthodontic treatment and presenting Class II malocclusion, observed by a mean period of 2.12 years. It was evaluated the cephalograms before and after orthodontic treatment for Group 1 and observational period for Group 2. Initial and final cephalometric variables and changes with treatment were compared between the groups by independent t tests. RESULTS: When compared to the control group, the Jasper Jumper group presented greater restriction of anterior displacement of the maxilla and a greater maxillary retrusion, improvement of maxillomandibular relationship, reduction of facial convexity, greater protrusion and intrusion of mandibular incisors and a greater extrusion of mandibular molars, besides a greater reduction of overjet and overbite and improvement of molar relationship. CONCLUSION: The correction of the Class II in the group treated with the Jasper Jumper and fixed appliances was mainly due to restriction of maxillary growth, protrusion and intrusion of mandibular incisors and extrusion of mandibular molars.
Class II malocclusion; Cephalometrics; Functional appliance
