Maxillofacial Plastic and Reconstructive Surgery

Korean Association of Maxillofacial Plastic and Reconstructive Surgeons (대한악안면성형재건외과학회)
권호 표지

CHANGES OF THE HYOID BONE POSITION AND THE UPPER AIRWAY DIMENSION AFTER ORTHOGNATHIC SURGERY IN SKELETAL CLASS III PATIENTS

골격성 3급 부정교합자의 악교정 수술 후 설골 위치와 상기도 크기의 변화

  • Kim, Ji-Yong (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Yongdong Severance Hospital) ;
  • Ahn, Je-Young (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Yongdong Severance Hospital) ;
  • Lim, Jae-Hyung (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Yongdong Severance Hospital) ;
  • Huh, Jong-Ki (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Yongdong Severance Hospital) ;
  • Park, Kwang-Ho (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Yongdong Severance Hospital)
  • 김지용 (연세대학교 치과대학 구강악안면외과학교실 영동세브란스병원) ;
  • 안제영 (연세대학교 치과대학 구강악안면외과학교실 영동세브란스병원) ;
  • 임재형 (연세대학교 치과대학 구강악안면외과학교실 영동세브란스병원) ;
  • 허종기 (연세대학교 치과대학 구강악안면외과학교실 영동세브란스병원) ;
  • 박광호 (연세대학교 치과대학 구강악안면외과학교실 영동세브란스병원)
  • Published : 2006.01.31
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Abstract

After orthognathic surgery in skeletal class III patients, the hyoid bone position and the upper airway dimension could be changed due to mandibular setback. There has been many studies about airway dimension of the patients with skeletal class II malocclusion or obstructive sleep apnea. but not with skeletal class III. The purpose of this study was to examine the change of position of the hyoid bone and the consequent change of airway space as the result of retrusion of mandible after orthognathic surgery in skeletal Cl III malocclusion patients. It is also to apply this results in predicting, diagnosing and treating the subsequent obstructive sleep apnea. Forty patients who were diagnosed as skeletal Cl III maloccusion, received orthoganthic surgery of both jaws including mandibular setback, and were followed up post-operatively for more than 6 months were selected. There were 10 male patients 30 female patients. The preoperative and postoperative lateral cephalograms were traced and the distances and angles were measured. The nasopharyngeal space increased postoperatively while the oropharyngeal space decreased. Except for the change of oroparyngeal space, the changes in male patients were greater than female patients. The hyoid bone moved in the posterior-inferior direction, and the change was greater in males than in females. If the postoperative mandibular setback is great, then a significant decrease of airway space and posterior and inferior movement of the hyoid bone were observed. This can result in symptoms related to obstructive sleep apnea. This result should be considered in the diagnosis and treatment planning of orthognathic surgery patients.

Keywords

References

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