Maxillofac Plast Reconstr Surg.  2015 Oct;37(10):38. 10.1186/s40902-015-0039-8.

Retrospective study of changes in pharyngeal airway space and position of hyoid bone after mandibular setback surgery by cephalometric analysis

Affiliations
  • 1Department of Oral and Maxillofacial Surgery, College of Medicine, Inha University, #7-206, 3rd St. Shinheung-dong, Choong-gu, Incheon, 400-711 South Korea. kik@inha.ac.kr
  • 2Department of Oral and Maxillofacial Surgery, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, South Korea.

Abstract

BACKGROUND
The posterior movement of mandible was known as the main cause of the changes in the pharyngeal airway space (PAS) and the postoperative obstructive sleep apnea (OSA). The purpose of this study was to know the changes of PAS and position of hyoid bone.
METHODS
Lateral cephalographies of 13 patients who had undergone sagittal split ramus osteotomy (SSRO) setback surgery were taken preoperatively (T1), postoperatively within 2 months (T2), and follow-up after 6 months or more (T3). On the basis of F-H plane, diameters of nasopharynx, oropharynx, and hypopharynx were measured. The movements of the soft palate, tongue, and hyoid bone were also measured.
RESULTS
The amount of mandible setback was 7.5 +/- 3.8 mm. In the measurements of PAS, there was a statistically significant decrease of 2.8 +/- 2.5 mm in nasopharynx (P < 0.01), and 1.7 +/- 2.4 mm in oropharynx (P < 0.01) were observed after surgery. The hypopharynx decreased 1.0 +/- 2.1 mm after surgery and continuously decreased 1.0 +/- 2.8 mm at follow-up. The changes in hyoid bone position showed the posterior movement only after surgery and posteroinferior movement at follow-up.
CONCLUSIONS
The PAS such as nasopharynx, oropharynx, and hypopharynx showed relatively high correlation with the amount of mandibular setback. The change of resistance in upper airway may be important for the prevention of OSA after mandibular setback surgery.

Keyword

Pharyngeal airway space; Mandibular setback; Hyoid bone; Cephalometric

MeSH Terms

Follow-Up Studies
Humans
Hyoid Bone*
Hypopharynx
Mandible
Nasopharynx
Oropharynx
Osteotomy, Sagittal Split Ramus
Palate, Soft
Retrospective Studies*
Sleep Apnea, Obstructive
Tongue
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