Fig.2From: Change of the upper airway after mandibular setback surgery in patients with mandibular prognathism and anterior open biteVertical and horizontal positioning of the hyoid bone was measured in CT (mm). The x-axis was defined as the line tangent to the inferior point of the sella turcica and parallel to the FH plane, while the y-axis was defined as the line passing through the nasion and perpendicular to the x-axisBack to article page