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Abstract
Introduction: The purpose of this retrospective study, using head and neck Cone-Beam Computed Tomography (CBCT) images, was to measure and compare volumetric, area, and linear changes of the pharyngeal airway space in patients treated with a MARA or Herbst Class II correction appliances. Materials and Methods: Twenty-six patients treated with a MARA (mean age 13.2), nine with a Herbst (mean age 12.12) , and a control group twenty-five orthodontically treated class I patients (mean age 13.11). T1 and T2 CBCT images were measured and compared between the three groups for area, length, and width measurements along the velo-, oro-, and hypopharyngeal airway as well as the overall volume. Results: The ANCOVA showed a significant decrease in the change of B length in the MARA and Herbst groups compared to the control group (P=.003). An additional ANCOVA taking gender, expansion, skeletal and dental classifications into account showed no significant changes in all the measurements in the treatment and control groups. Conclusions: The MARA and Herbst appliance did not show any significant changes in the overall volume, areas, or linear measurements along the pharyngeal airway
