Change of Upper Airway after Mandibular Setback by BSSRO in Patients with Skeletal Ⅲ Malocclusion

doi:10.13701/j.cnki.kqyxyj.2020.10.012

Abstract

Abstract: Objective: To evaluate the change in pharyngeal airway space and the position of hyoid bone after mandibular setback in patients with skeletal Ⅲ malocclusion. Methods: 25 patients with skeletal Ⅲ malocclusion were collected from Jan. 2016 to Jun.2019 in Xuzhou Stomatological Hospital, in which male were 13 and female were 12. The mean age was 22.15. The bilateral sagittal split ramus osteotomy (BSSRO) was applied. Lateral cephalometric radiographs were taken before and after surgery. The changes of airway in soft palate, tongue, epiglottis region, and hyoid bone position were measured in sagittal direction. Results: After the operation, the soft palate, base of tongue, and posterior area of epiglottis were narrowed, and hyoid bone shifted backwards and downward in all patients. There was no significant statistical difference in upper airway between male and female, while hyoid bone position in males was lower than that in females. Conclusion: The study indicated that BSSRO made upper airway narrow in different degrees and hyoid bone shifting after operation. Obstructive sleep apnea-hypopnea syndrome would be caused by the great amount of mandibular setback

Key words: lateral cephalometric radiograph, upper airway, mandibular setback

LIU Gang, ZHANG Liang, LI Changshun. Change of Upper Airway after Mandibular Setback by BSSRO in Patients with Skeletal Ⅲ Malocclusion[J]. Journal of Oral Science Research, 2020, 36(10): 938-941.

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