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Angle Orthod. 2015 Mar;85(2):270-7. doi: 10.2319/012514-68.1. Epub 2014 Jun 3.

Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances.

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  • 1a Adjunct Professor, Department of Orthodontics, Faculty of Odontology, University Complutense, Madrid, Spain.

Abstract

OBJECTIVE:

To analyze the long-term stability of rapid maxillary expansion (RME) and protraction from chincup therapy in girls with Class III malocclusion.

MATERIALS AND METHODS:

Twenty-two girls (mean age  =  9.1 ± 0.6 years) with Class III malocclusion were treated with combined RME and protraction from a chincup, followed by fixed appliances. Lateral cephalograms were evaluated before treatment, at the end of a two-phase treatment protocol (mean age  =  15.1 ± 1.1 years), and 10.9 ± 0.5 years after the end of treatment (mean age  =  27.5 ± 0.5 years). The control group consisted of 22 matched girls with skeletal Class I malocclusion.

RESULTS:

After treatment, the Class III group showed significant improvement of the Class III malocclusion, mainly due to changes in the mandible (ie, SNB angle decreased 1.8 ± 1.6°) and significant improvement of the sagittal maxillomandibular relationship (Wits appraisal increased 2.6 ± 2.1 mm; ANB angle increased 1.0 ± 0.3 mm). These changes remained stable for an average of 10 years after the end of therapy. No tendency toward relapse was detected, and the mandibular position showed favorable outcomes.

CONCLUSIONS:

RME and protraction from chincup therapy led to successful long-term outcomes in 18 of 22 patients (81.8%). This treatment approach can be considered an efficient therapy in growing girls with mild skeletal Class III malocclusion caused by maxillary retrusion and mandibular protrusion.

KEYWORDS:

Chincup; Class III; Long-term; Maxillary protraction; Stability

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