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Changes in position of the hyoid bone and volume of the pharyngeal airway after mandibular setback: three-dimensional analysis

Authors
 Jin Hoo Park  ;  Hee-Sung Kim  ;  Sung-Hwan Choi  ;  Young-Soo Jung  ;  Hwi-Dong Jung 
Citation
 British Journal of Oral & Maxillofacial Surgery, Vol.57(1) : 29-35, 2019 
Journal Title
 British Journal of Oral & Maxillofacial Surgery 
ISSN
 0266-4356 
Issue Date
2019
Keywords
Intraoral vertical ramus osteotomy ; hyoid bone ; mandibular setback surgery ; pharyngeal airway ; three-dimensional analysis
Abstract
Important aspects of orthognathic surgery are the effects of skeletal movement and changes in the position of the hyoid bone, tongue, soft palate, and dimensions of the pharyngeal airway. Our aims were to evaluate the 3-dimensional changes in the pharyngeal airway and in the position of the hyoid bone after mandibular setback in 30 patients who were diagnosed with mandibular prognathism and were treated by intraoral vertical ramus osteotomy (IVRO). Three-dimensional cone-beam computed tomographic (CT) images were obtained preoperatively, one month postoperatively, and one year postoperatively. The total pharyngeal volume decreased between the preoperative state and one month and one year afterwards. The hyoid bone had moved 2.0mm posteriorly and 3.15mm superiorly by one month postoperatively. The position of the hyoid bone was affected by changes in posterior and superior movement of the B point at one month (r=0.44, p=0.015 and R=0.63, p=0.000, respectively) and also by superior movement of the B point at one year (r=0.57, p=-0.001). There was an advantageous relation between posterior positional changes in the B point (mandibular setback), and volumetric changes in the hypopharyngeal and total pharyngeal airway, so maxillofacial surgeons should consider the reduction in airway when planning excessive mandibular setback.
Full Text
https://www.sciencedirect.com/science/article/pii/S0266435618306740
DOI
10.1016/j.bjoms.2018.12.003
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
Yonsei Authors
박진후(Park, Jin Hoo) ORCID logo https://orcid.org/0000-0003-2337-9554
정영수(Jung, Young Soo) ORCID logo https://orcid.org/0000-0001-5831-6508
정휘동(Jung, Hwi Dong) ORCID logo https://orcid.org/0000-0003-1025-8323
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/167573
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