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.
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
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.
The high-pull traction on the Stephenson plate produced more dental than skeletal outcomes in growing subjects,
despite of the application of orthopaedic forces.
Vol.21 – n.4/2020
Harvard: F. Silvestrini-Biavati, L. Lazzarotti, S. Bini, M. Migliorati, A. Ugolini (2020) "Maxillary “en masse” high-pull traction in Class II division 1 subjects: Which kind of skeletal outcomes does it produce?", European Journal of Paediatric Dentistry, 21(4), pp271-276. doi: 10.23804/ejpd.2020.21.04.3
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