Cephalometric evaluation in different phases of Jasper jumper therapy

Introduction: The aim of this study was to evaluate the dentoskeletal and soft-tissue effects of Class II malocclusion treatment with the Jasper jumper followed by Class II elastics at the different stages of therapy.

Methods: The sample comprised 24 patients of both sexes (11 boys, 13 girls) with an initial age of 12.58 years, treated for a mean period of 2.15 years. Four lateral cephalograms were obtained of each patient in these stages of orthodontic treatment: at pretreatment (T1), after leveling and alignment (T2), after the use of the Jasper jumper appliance and before the use of Class II intermaxillary elastics (T3), and at posttreatment (T4). Thus, 3 treatment phases could be evaluated: leveling and alignment (T1-T2), use of the Jasper jumper (T2-T3), and use of Class II elastics (T3-T4). Dependent analysis of variance (ANOVA) and Tukey tests were used to compare the durations of the 3 treatment phases and for intragroup comparisons of the 4 treatment stages. Results: The alignment phase showed correction of the anteroposterior relationship, protrusion and labial inclination of the maxillary incisors, and reduction of overbite. The Jasper jumper phase demonstrated labial inclination, protrusion and intrusion of the mandibular incisors, mesialization and extrusion of the mandibular molars, reduction of overjet and overbite, molar relationship improvement, and reduction in facial convexity. The Class II elastics phase showed labial inclination of the maxillary incisors; retrusion, uprighting, and extrusion of the mandibular incisors; and overjet and overbite increases. Conclusions: The greatest amount of the Class II malocclusion
anteroposterior discrepancy was corrected  with the Jasper jumper appliance. Part of the correction was lost during Class II intermaxillary elastics use after use of the Jasper jumper appliance. (Am J Orthod Dentofacial Orthop 2011;140:e77-e84)

FROM THE DEPARTMENT OF ORTHODONTICS, BAURU DENTAL SCHOOL, UNIVERSITY OF SAO PAULO, BAURU, BRAZIL.
APOSTGRADUATE STUDENT. BPROFESSOR. CPROFESSOR AND HEAD.
THE AUTHORS REPORT NO COMMERCIAL, PROPRIETARY, OR FINANCIAL INTEREST IN THE PRODUCTS OR COMPANIES DESCRIBED IN THIS ARTICLE.
REPRINT REQUESTS TO: GUILHERME JANSON, DEPARTMENT OF ORTHODONTICS, BAURU DENTAL SCHOOL, UNIVERSITY OF S~AO PAULO, ALAMEDA OCTAVIO PINHEIRO BRISOLLA 9-75, BAURU, SP, 17012-901, BRAZIL; E-MAIL, JANSONG@TRAVELNET.COM.BR.
SUBMITTED, SEPTEMBER 2010; REVISED AND ACCEPTED, MARCH 2011.
0889-5406/$36.00
COPYRIGHT
2011 BY THE AMERICAN ASSOCIATION OF ORTHODONTISTS.
DOI:10.1016/J.AJODO.2011.03.018