Mandibular behavior in the treatment of skeletal Class II malocclusion: a 5-year post-retention analysis

Authors

  • Ana de Lourdes Sá de Lira Federal University of Rio de Janeiro (UFRJ)
  • Antonio Izquierdo Federal University of Rio de Janeiro (UFRJ)
  • Sávio Prado Federal University of Rio de Janeiro (UFRJ)
  • Lincoln Issamu Nojima Federal University of Rio de Janeiro (UFRJ)
  • Matilde Nojima Federal University of Rio de Janeiro (UFRJ)

DOI:

https://doi.org/10.20396/bjos.v8i4.8642036

Keywords:

Skeletal Class II malocclusion, Mandibular behavior, Kloehn cervical headgear, Post-retention

Abstract

Aim: This study aimed to assess mandibular behavior in Class II subjects subjected to full orthodontic treatment with standard edgewise appliance and cervical headgear (Kloehn appliance) during the pubertal growth spurt period. Methods: Lateral cephalometric radiographs of 40 patients (21 females and 19 males) were performed at the beginning of the treatment (T0 ), at its end (T1 ) and at 5-year post-retention phase (T2 ) in order to quantify the cephalometric measurements (8 angular and 3 linear), representing the mandibular behavior in the anteroposterior and vertical senses. The mean age of female patients at T0 , T1 and T2 was 11.4, 15 and 26 years, respectively, and for male patients it was 12.2, 16.7 and 28 years, respectively. All patients were treated in just one phase without extractions and not associating Class II intermaxillary elastics. Results: The effective treatment of skeletal Class II malocclusion with conventional Edgewise fixed appliance and Kloehn cervical headgear did not interfere in the direction and amount of mandibular growth as well as remodeling at it is inferior border, with no influence in anti-clockwise rotation of the mandible. The mandibular growth was also observed after the orthodontic treatment, suggesting that it is influenced by genetic factors. Conclusion: These observations may lead to the speculation that growing patients with skeletal Class II malocclusion and low mandibular plane are conducive to a good treatment and long-term stability.

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Author Biographies

Ana de Lourdes Sá de Lira, Federal University of Rio de Janeiro (UFRJ)

DDS, MS, Doctorate student, Department of Orthodontics, Dental School, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ

Antonio Izquierdo, Federal University of Rio de Janeiro (UFRJ)

DDS, MS, Doctorate student, Department of Orthodontics, Dental School, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ

Sávio Prado, Federal University of Rio de Janeiro (UFRJ)

DDS, MS, Doctorate student, Department of Orthodontics, Dental School, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ

Lincoln Issamu Nojima, Federal University of Rio de Janeiro (UFRJ)

DDS, PhD, Professor, Department of Orthodontics, Dental School, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ

Matilde Nojima, Federal University of Rio de Janeiro (UFRJ)

DDS, PhD, Professor, Department of Orthodontics, Dental School, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ

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Published

2015-12-02

How to Cite

1.
Lira A de LS de, Izquierdo A, Prado S, Nojima LI, Nojima M. Mandibular behavior in the treatment of skeletal Class II malocclusion: a 5-year post-retention analysis. Braz. J. Oral Sci. [Internet]. 2015 Dec. 2 [cited 2022 Dec. 9];8(4):166-70. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8642036

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