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Maxillary “en masse” high-pull traction in Class II division 1 subjects: Which kind of skeletal outcomes does it produce?
 

Type:  Articles

Pubblication date:  31/2020

Authors:  F. Silvestrini-Biavati, L. Lazzarotti, S. Bini, M. Migliorati, A. Ugolini

Language:  English

Institution:  Department of Orthodontics, University of Genoa, Genoa, Italy

Publication:  European Journal of Paediatric Dentistry

Publisher:  Ariesdue Srl

Keywords:  Class II malocclusion; Orthopaedic high-pull traction; Maxillary distal movement; Stephenson plate; Orthopaedic force.

Email:  [email protected]

URL:  https://ejpd.eu/EJPD_2020_21_04_03.pdf


Title:  Maxillary “en masse” high-pull traction in Class II division 1 subjects: Which kind of skeletal outcomes does it produce?

Abstract:  Aim The aim of the present prospective study was to evaluate if the treatment performed using high-pull traction on a Stephenson plate had real orthopaedic outcomes in subjects with severe Class II Division 1 malocclusion due to maxillary protrusion. Materials and methods Twenty-three growing patients showing Class II Division 1 malocclusion (Stephenson plate group, SPG) were treated and compared with an untreated Class II control group (CG – 21 subjects selected from the database of Bolton-Brush Growth Study). Lateral cephalograms at T0 and T1 for both groups were analysed using cephalometric tracing by Jarabak, Pancherz and Ghosh-Nanda. Results Orthopaedic forces were applied in SPG. SPG group showed significantly greater decrease than CG group of SNA° (-1.4° vs +0.7°), ANB° (-1.3° vs +0°), WITS (-1° vs 0.6°), overjet (-4.1 mm vs +0.3 mm), molar relationships (–6.1° mm vs -0.1 mm) and upper incisors proclination (1/SpP, -10.3° vs -1°). The maxilla substantially maintained its position (A/OLp +0.3 mm, SNA° -1.4°) while the mandible slightly grew (Pg/OLp +1.7 mm; SNB° + 0.7°). Facial pattern and AFA/AFP ratio did not change. Conclusions The high-pull traction on the Stephenson plate produced more dental than skeletal outcomes in growing subjects, despite of the application of orthopaedic forces.

 
 
 
 
 
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