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ORIGINAL ARTICLE
Year : 2014  |  Volume : 2  |  Issue : 3  |  Page : 142-148

Class II division 1 malocclusions treated with fixed lingual mandibular growth modificator (FLMGM): The mechanism of sagittal occlusal correction


Department of Orthodontics, School of Dentistry, University of Aleppo, Aleppo, Syria

Correspondence Address:
Osama Alali
Department of Orthodontics, School of Dentistry, University of Aleppo, Al-Shahbaa, P.O. Box: 10256, Aleppo
Syria
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Source of Support: This work was supported by University of Damascus and University of Aleppo, Conflict of Interest: None


DOI: 10.4103/2321-3825.140685

Clinical trial registration NCT01853995

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Objectives: The objective of this study is to assess skeletal and dental changes contributing to sagittal correction of Class II malocclusion with fixed lingual mandibular growth modificator (FLMGM). Materials and Methods: A total of 38 patients with dental Class II division 1 malocclusion and retrognathic mandible comprised the study sample. All were in the pubertal growth spurt. While FLMGM was applied to the treatment group (n = 21, 13.2 years), no treatment was performed on the control group (n = 17, 12.5 years). Digital lateral cephalograms obtained at the beginning and end of treatment/observation period of 8 months were evaluated using sagittal occlusal analysis. Paired and independent t-tests were used to assess the differences within and between groups. Results: Fixed lingual mandibular growth modificator treatment resulted in the following significant changes: (1) Total mandibular length increased; (2) sagittal jaw relation enhanced due to chin advancement; (3) overjet reduced (4.06 mm) mainly as a result of skeletal mandibular advancement (83%) in combination with maxillary incisor retraction (17%); (4) Class II molar relation improved (5.56 mm) by a contribution of mandibular advancement (61%) and maxillary molar distalization (39%). Conclusions: Sagittal occlusal relationships efficiently improved by greater skeletal than dental changes. Stable horizontal position of lower molars and incisors was a benefit of FLMGM treatment.


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