Changes of the Airway Space and the Position of Hyoid Bone after Mandibular Set Back Surgery Using Bilateral Sagittal Split Ramus Osteotomy Technique.

The increase observed at T1 consistently showed a decreasing trend across patients ( Table 1 ). 2) Change of horizontal position The vertical distance of hyoid from the baseline changed from 14.07±6.70 mm (T0) to 9.71±6.26 mm (T1), and this pattern continued for six months after surgery. 3) Change of the hyoid bone position relative to the symphysis of the mandible The distance between the hyoid bone and the most posterior point of the symphysis of the mandible increased from 40.69±4.68 mm (T0) to 41.94±5.56 mm (T1) as the hyoid bone moved backward postoperatively, but decreased to 39.72±4.97 mm (T3) six months post-surgically. 2.

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