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Soft tissue effects of three different Class II/1-camouflage treatment strategies

  • Ezgi AtikEmail author
  • Bengisu Akarsu-Guven
  • Ilken Kocadereli
Original Article

Abstract

Objective

Aim of this retrospective study was to compare soft tissue effects of Class II treatments with the forsus fatigue resistant device (FRD), the pendulum appliance, and the extraction of two maxillary premolars, all of which were combined with pre-adjusted fixed appliances.

Patients and methods

The sample of 54 patients with Class II malocclusions was divided in three groups: group I patients (mean age = 15.91 years) were treated with the FRD concurrently used with fixed appliances; group II patients (mean age = 16.08 years) were treated with the pendulum appliance combined with a Nance and headgear followed by fixed appliances; and group III patients (mean age = 19.04 years) were treated with the extraction of two maxillary premolars with miniscrew anchorage. Soft tissue and dentoskeletal parameters were measured on pretreatment (T1) and posttreatment (T2) lateral cephalograms. The changes from T1 to T2 were compared between the groups using Kruskal–Wallis test, and treatment differences were evaluated with the Wilcoxon test at p < 0.05.

Result

Soft tissue measurement changes related to the upper and lower lips were significantly greater in group II than in group III (p < 0.05). Upper incisor measurement changes were significantly different between groups II and III. Lower incisor measurement changes were significantly different between groups I and III and groups II and III (p < 0.05).

Conclusions

Pendulum and extraction treatment groups showed significant differences in relation with the upper and lower lip positional changes, which were significantly greater in the pendulum group. Treatment time with the extraction treatment was statistically shorter than with the nonextraction protocols.

Keywords

Class II Pendulum Forsus Premolar extraction Treatment time 

Weichteileffekte dreier unterschiedlicher Strategien zur Klasse II/1-Camouflage-Behandlung

Zusammenfassung

Zielsetzung

In dieser retrospektiven Untersuchung sollte verglichen werden, welche Weichgewebeauswirkungen bei drei verschiedenen Klasse-II-Behandlungen entstehen: mittels einer gegen Ermüdung beständig(er)en Forsus-Apparatur (Forsus Fatigue Resistant Device, FRD), einer Pendulum-Apparatur bzw. der Extraktion zweier Prämolaren im Oberkiefer. Jede Behandlungsvariante war kombiniert mit vorher individuell angepassten festsitzenden kieferorthopädischen Apparaturen.

Patienten und Methoden

Insgesamt 54 Patienten mit Klasse-II-Malokklusion wurden in 3 Gruppen aufgeteilt: Patienten der Gruppe I (Altersdurchschnitt 15,91 Jahre) wurden gleichzeitig mit der FRD und festsitzenden Apparaturen behandelt, Patienten der Gruppe II (16,08) mit der Pendulum-Apparatur in Kombination mit einer Nance-Apparatur sowie einem Headgear, und Patienten der Gruppe III (19,04) mit Prämolarenextraktion und Minischrauben-Verankerung. Auf Fernseitenaufnahmen wurden Weichgewebe- und dentoskelettale Parameter vor (T1) und nach (T2) der Behandlung vermessen. Veränderungen zwischen T1 und T2 wurden zwischen den beiden Gruppen mit dem Kruskal–Wallis-Test verglichen, behandlungsbedingte Unterschiede wurden mit dem Wilcoxon-Test evaluiert (p < 0,05).

Ergebnisse

Die Weichgewebeveränderungen in Bezug auf Ober- und Unterlippe waren in der Gruppe II statistisch signifikant stärker ausgeprägt als in Gruppe III (p < 0,05). Die Veränderungen im Bereich der oberen Inzisiven waren in beiden o.a. Gruppen signifikant unterschiedlich. Die Messungen im Bereich der unteren Inzisiven unterschieden sich signifikant sowohl zwischen den Gruppen I und III als auch zwischen den Gruppen II und III (p < 0,05).

Schlussfolgerung

In der Pendulum- und in der Extraktionsgruppe zeigten sich signifikante Unterschiede hinsichtlich der Positionsveränderungen von Ober- und Unterlippe. Diese waren in der Pendulumgruppe deutlich stärker ausgeprägt als in der Extraktionsgruppe. Die Behandlungszeit war bei der Extraktionstherapie signifikant kürzer als bei den Non-Extraktionsbehandlungen.

Schlüsselwörter

Angle-Klasse II Pendulum-Apparatur Forsus-Apparatur Prämolarenextraktion Behandlungsdauer 

Notes

Compliance with ethical guidelines

Conflict of interest

E. Atik, B. Akarsu-Guven, and I. Kocadereli state that there are no conflicts of interest.

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Ezgi Atik
    • 1
    Email author
  • Bengisu Akarsu-Guven
    • 1
  • Ilken Kocadereli
    • 1
  1. 1.Department of Orthodontics, Faculty of DentistryHacettepe UniversityAnkaraTurkey

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