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Changes of hyoid, tongue and pharyngeal airway after mandibular setback surgery by intraoral vertical ramus osteotomy

 Soonshin Hwang  ;  Chooryung Judi Chung  ;  Yoon-Jeong Choi  ;  Jong-Ki Huh  ;  Kyung-Ho Kim 
 ANGLE ORTHODONTIST, Vol.80(2) : 302-308, 2010 
Journal Title
Issue Date
AirwayObstruction/etiology ; Cephalometry ; Cervical Vertebrae/anatomy & histology ; Confidence Intervals ; Female ; Head ; Humans ; Hyoid Bone/anatomy & histology* ; Male ; Malocclusion, Angle Class III/surgery* ; Mandible/surgery* ; OrthognathicSurgicalProcedures*/adverse effects ; Osteotomy ; Osteotomy, Le Fort ; Pharynx/anatomy & histology* ; Posture ; Recurrence ; Statistics, Nonparametric ; Tongue/anatomy & histology* ; Treatment Outcome ; Young Adult
Hyoid ; Tongue ; Pharyngeal airway ; Mandibular setback ; Intraoral vertical ramus osteotomy
OBJECTIVE: To assess changes in hyoid, tongue, pharyngeal airway, and head posture in patients who had mandibular setback surgery by intraoral vertical ramus osteotomy (IVRO) and to investigate the influence of LeFort I osteotomy.

MATERIALS AND METHODS: Sixty patients with skeletal Class III malocclusion were evaluated. All patients had mandibular setback surgery via IVRO, and 45 patients had additional maxillary impaction surgery via LeFort I osteotomy. Lateral cephalograms were taken before, immediately after, approximately 1 month after, and at least 1 year after surgery. Parameters indicating the hyoid, tongue, pharyngeal airway, and head posture were evaluated.

RESULTS: The hyoid significantly moved inferoposteriorly immediately after surgery and relapsed superoanteriorly during observation periods. The tongue significantly moved posteriorly during all periods. The final position of the hyoid and tongue was significantly posterior, and the final pharyngeal airway was significantly narrower compared with its presurgical position. Significant cervical hyperflection occurred during observation periods and was strongly correlated with anterior movement of the hyoid. The hyoid and tongue showed similar positions regardless of the presence of different genders or LeFort I osteotomy after the long-term observation period.

CONCLUSIONS: The hyoid and tongue moved posteriorly after mandibular setback surgery via IVRO, and there was a tendency to relapse back to its original position. However, the final pharyngeal airway width remained narrower after the long-term observation period. Based on our results, careful monitoring of the airway may be needed after mandibular setback surgery via IVRO.
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2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Ho(김경호) ORCID logo https://orcid.org/0000-0002-8154-2041
Chung, Chooryung J.(정주령) ORCID logo https://orcid.org/0000-0001-9399-7193
Choi, Yoon Jeong(최윤정) ORCID logo https://orcid.org/0000-0003-0781-8836
Huh, Jong Ki(허종기) ORCID logo https://orcid.org/0000-0002-7381-3972
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