Comparative cephalometric study of dental and skeletal effects caused by MPA3 (Mandibular Protraction Appliance) and Jasper Jumper appliances in initial phase and immediately after mandible advancement

Nasser G. KAMACHE, Tania M. S. IANI, Antônio G. OLIVEIRA, Gilberto OLIVEIRA JR., José N. OLIVEIRA, José N. OLIVEIRA JR.

Aim: to observe the dental and skeletal effects occurred after use the MPA and Jasper Jumper. Methods: the sample of 34 patients, with both genders, 11 years and 8 months of middle age, during the growth, presenting Class II malocclusion with retraction of mandible. The patients were divided in three groups. Group 1 - 14 patients treated with MPA; group 2 - 10 patients treated with Jasper Jumper appliance; and group 3 (control group) - 10 patients without orthodontic treatment. In both groups 1 and 2, was made a cephalometric radiograph before the installation of any appliance and immediately after the advancement of mandible. In the group 3 (control) the patients were observed by a period of 8 months and 29 days. IMPA, 1.PP, Nperp-A, Nperp-P and FMA were the cephalometric measurements used. Results and Conclusions: 1) there were no dental and skeletal changes in group 1 (MPA 3) in relation group 3 (control); 2) there were a vestibular inclination of lower incisors in group 2 (Jasper Jumper) bigger than group 3 (control) and none skeletal changes; 3) although there were no significant alterations between groups 1 and 2 (MPA and JASPER JUMPER), there were a tendency of vestibular inclination of lower incisor in group 2 (Jasper Jumper); and there were no skeletal differences between two experimental groups.

Keywords: Class II malocclusion. Cephalometric study. MPA. Jasper Jumper.

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