Comparison of the dentoskeletal and soft tissue changes with the cervical headgear and Jones Jig followed by fixed appliances in Class II malocclusion patients: A retrospective study.

Abstract

OBJECTIVE:

To retrospectively compare the dentoskeletal and soft tissue changes of patients with Class II malocclusion treated with cervical headgear and Jones Jig appliances, followed by fixed appliances.

MATERIAL AND METHODS:

The sample comprised 46 Class II malocclusion patients divided into two groups. Patients with Class II malocclusion based on the ANB angle and plaster model analyses, needing non-extraction orthodontic treatment, absence of mandibular crowding and no previous orthodontic treatment were eligible to be selected. Group 1 consisted of 25 patients treated with cervical headgear (CH) followed by fixed appliances for a mean period of 3.26 years and group 2 consisted of 21 patients treated with the Jones Jig (JJ) appliance for a mean of 4.29 years. Lateral cephalograms were evaluated at the beginning and at the end of orthodontic treatment. For intergroup comparisons, t and Mann-Whitney tests were performed.

RESULTS:

The cervical headgear group produced significantly greater maxillary anterior displacement restriction (SNA; CH: -0.97°±1.33; JJ: 0.07°±1.73; P=0.025), apical base discrepancy improvement (ANB; CH: -1.52°±1.25; JJ: 0.36°±1.46; P=0.006), FMA reduction (CH: -0.78°±2.68; JJ: 1.07°±2.84; P=0.028) and distal mandibular molar angulation (Md6.PM; CH: 6.97°±3.66; JJ: 2.77°±6.87; P=0.013) than the Jones Jig group.

CONCLUSIONS:

Both distalizers followed by fixed appliances were effective to correct Class II malocclusion. The cervical headgear group presented skeletal effects with less treatment time and there were no significant intergroup differences regarding soft tissue changes.

• Authors: Fernanda Pinelli Henriques Fontes, Silvio Augusto Bellini-Pereira, Aron Aliaga-Del-Castillo, Mayara Paim Patel, Marcos Roberto de Freitas, José Fernando Castanha Henriques, Guilherme Janson
• Journal: International orthodontics (Int Orthod) Vol. 18 Issue 3 Pg. 424-435 (Sep 2020) ISSN: 1879-680X [Electronic] France
• PMID: 32278665 (Publication Type: Journal Article)
• Copyright: Copyright © 2020 CEO. Published by Elsevier Masson SAS. All rights reserved.

Topics

• Adolescent
• Anatomic Landmarks
• Brazil
• Cephalometry
• Child
• Extraoral Traction Appliances
• Female
• Humans
• Male
• Malocclusion, Angle Class II (therapy)
• Mandible
• Maxilla
• Molar
• Orthodontic Appliance Design
• Orthodontic Appliances, Fixed
• Orthodontics, Corrective (instrumentation)
• Retrospective Studies
• Tooth Movement Techniques (instrumentation, methods)