Ethics approval and consent to participate
This study was approved by the Institutional Review Board at the Faculty of Dentistry, Alexandria University, Alexandria, Egypt (IRB:00010556–IORG:0008839) Manuscript Ethics Committee number (0418-03/2022). The trial was registered on ClinicalTrials.gov, with the name of the registry being “CEPHALOMETRIC CHANGES IN PHARYNGEAL AIRWAY DIMENSIONS AFTER FUNCTIONAL TREATMENT WITH TWIN BLOCK VERSUS MYOBRACE APPLIANCES IN DEVELOPING SKELETAL CLASS II PATIENTS: A RANDOMIZED CLINICAL TRIAL.” The trial registration number is NCT05610150 on 02/11/2022, and the URL is 