The Open Dentistry Journal

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Effects of Mandibular Protraction Appliance and Jasper Jumper in Class II Malocclusion Treatment

Rafael P. Henriques1, José F. C. Henriques2, Guilherme Janson2, Marcos R. de Freitas2, Karina M. S. Freitas2, 3, *, Manoela F. Francisconi1, Fernanda P. H. Fontes1
1 Department of Orthodontics, FACOP, Piratininga, São Paulo, Brazil
2 Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo,Brazil
3 Department of Orthodontics, Uninga University Center, Maringa, Parana, Brazil



This study aimed to compare the effects of Mandibular Protraction Appliance (MPA) and Jasper Jumper (JJ), associated with fixed orthodontic appliances for Class II malocclusion treatment.

Materials and Methods:

Sample comprised of 71 subjects, divided into 3 groups: Group 1: 24 patients, mean initial age 12.36 years, treated with MPA for 2.74 years; Group 2: 25 patients, mean initial age 12.72 years, treated with JJ for 2.15 years; Control Group: 22 subjects, mean age of 12.67 years, with untreated Class II malocclusion, followed for 2.12 years. Initial and final variables and treatment changes were compared between groups by ANOVA and Tukey tests.


JJ group presented greater restriction of growth and maxillary retrusion and MPA showed a greater increase of mandibular effective length. MPA and JJ groups showed improvement of maxillomandibular relationship. Maxillary incisors showed greater retrusion and retroclination in MPA group. MPA presented greater proclination of mandibular incisors and JJ showed greater protrusion. MPA and JJ groups presented a decrease in overbite and overjet.


MPA showed a significant increase in mandibular effective length and great dentoalveolar compensation. JJ showed significant restriction of maxillary anterior displacement and also important dentoalveolar compensations. JJ must be indicated mainly in cases with maxillary protrusion, and MPA, especially in cases with mandibular deficiency.

Keywords: Cephalometrics, Class II malocclusion, Functional appliances, Maxillary incisors, Jasper Jumper (JJ), Maxillomandibular relationship.

Article Information

Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 53
Last Page: 60
Publisher Id: TODENTJ-13-53
DOI: 10.2174/1874210601913010053

Article History:

Received Date: 20/11/2018
Revision Received Date: 2/01/2019
Acceptance Date: 24/1/2019
Electronic publication date: 28/02/2019
Collection year: 2019

© 2019 Henriques et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru - SP - Brazil - 17012-901/; Department of Orthodontics, Uninga University Center, Maringa, Parana, Brazil; Tel: 551432358333; E-mail:

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