Osama H Alali1. 1. a Assistant Professor, Department of Orthodontics, School of Dentistry, University of Aleppo, Al-Shahbaa, Aleppo, Syria.
Abstract
OBJECTIVE: To assess the net dentofacial effects of the fixed lingual mandibular growth modificator (FLMGM). MATERIALS AND METHODS: The study sample comprised 38 patients with Class II/1 malocclusion and retrognathic mandible. All were in the pubertal growth spurt. Whereas FLMGM was applied to the treatment group (n=21, mean age=13.2 years), no treatment was performed on the control group (n=17, mean age=12.5 years). Skeletal and dentoalveolar changes were assessed on digital lateral cephalograms obtained at the beginning and end of the treatment/observation period of 8 months. Paired and independent t-tests were used to assess the differences within and between groups. RESULTS: Maxillary growth was not affected by FLMGM treatment, which resulted in a significant overjet reduction of 4.1 mm, an increase in total mandibular length (Co-Gn) of 2.3 mm, chin advancement of 1.6°, and upper incisor retroclination of 4.0°. A reduction of 2.4° in ANB was largely due to an increase of 1.8° in SNB. Favorably, the lower incisors were obviously retroclined by 4.5°. The changes in the vertical skeletal relationships were negligible. CONCLUSION: FLMGM was effective in treating growing Class II/1 patients and produced favorable dentofacial effects, with the matched untreated sample showing minimal changes. Lower incisor retroclination was a benefit of FLMGM treatment.
OBJECTIVE: To assess the net dentofacial effects of the fixed lingual mandibular growth modificator (FLMGM). MATERIALS AND METHODS: The study sample comprised 38 patients with Class II/1 malocclusion and retrognathic mandible. All were in the pubertal growth spurt. Whereas FLMGM was applied to the treatment group (n=21, mean age=13.2 years), no treatment was performed on the control group (n=17, mean age=12.5 years). Skeletal and dentoalveolar changes were assessed on digital lateral cephalograms obtained at the beginning and end of the treatment/observation period of 8 months. Paired and independent t-tests were used to assess the differences within and between groups. RESULTS: Maxillary growth was not affected by FLMGM treatment, which resulted in a significant overjet reduction of 4.1 mm, an increase in total mandibular length (Co-Gn) of 2.3 mm, chin advancement of 1.6°, and upper incisor retroclination of 4.0°. A reduction of 2.4° in ANB was largely due to an increase of 1.8° in SNB. Favorably, the lower incisors were obviously retroclined by 4.5°. The changes in the vertical skeletal relationships were negligible. CONCLUSION: FLMGM was effective in treating growing Class II/1 patients and produced favorable dentofacial effects, with the matched untreated sample showing minimal changes. Lower incisor retroclination was a benefit of FLMGM treatment.
Authors: Paola Cozza; Tiziano Baccetti; Lorenzo Franchi; Laura De Toffol; James A McNamara Journal: Am J Orthod Dentofacial Orthop Date: 2006-05 Impact factor: 2.650
Authors: Kevin O'Brien; Jean Wright; Frances Conboy; YeWeng Sanjie; Nicky Mandall; Stephen Chadwick; Ivan Connolly; Paul Cook; David Birnie; Mark Hammond; Nigel Harradine; David Lewis; Cathy McDade; Laura Mitchell; Alison Murray; Julian O'Neill; Mike Read; Stephen Robinson; Dai Roberts-Harry; Jonathan Sandler; Ian Shaw Journal: Am J Orthod Dentofacial Orthop Date: 2003-08 Impact factor: 2.650