Aim of the study: is to compare the changes in the sagittal pharyngeal airway dimension (SPAD) and mandibular position before and after the levelling and alignment stage of orthodontic treatment in Class II division 2 patients.
Class II/2 subjects as per the British Standard Institute Classification.
Age ranging from 12-16 years, with Cervical Vertebral Maturational Index (CVMI) stages 4, and 5.
Contact between maxillary and mandibular incisors, with the presence of a deep bite of at least 70%.
Full permanent dentition, aside from the third molars
Previous orthodontic treatment.
Patients with severe transverse problems, pain and/or clicking sound in the temporomandibular joint (TMJ).
Patients with craniofacial anomalies or diagnosed syndromes
Single group
Orthodontic Treatment
Procedure/SurgeryAll the enrolled patients will undergo conventional fixed appliance therapy by bonding straight wire Roth appliance in the maxillary arch. The bonding procedure will be standardized in all patients and performed by the same operator using light-cured composite. Levelling and alignment will then be started using the following wire sequence: 0.014-in nickel titanium (NiTi), 0.018-in NiTi, 17×25-in Niti, and 19×25-in Niti arch wires. The upper arch will then be stabilized using a 19×25-in stainless steel (SS) arch wire for 2 months. This stage will require approximately 6 months of treatment.
Changes in the sagittal pharyngeal airway space (SPAD)
Changes in the mandibular position
Sagittal skeletal measurements
Vertical skeletal measurements
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Nourhan M.Aly
Lead sponsor
University of Alexandria
Sponsor institution
