WORLD JOURNAL OF PLASTIC SURGERY
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Volume 10, Issue 2 (2021)
WJPS 2021, 10(2): 46-54 |
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Moghaddam H H, Labafchi A, Mortazavi S, Khorasanchi M, Tohidi E, Hoseini-zarch S et al . The Effect of Orthognathic Surgery on the Hyoid Bone Position in Skeletal Class III Patients: An Evaluation Using Cephalometric Analysis. WJPS 2021; 10 (2) :46-54
URL: http://wjps.ir/article-1-780-en.html
URL: http://wjps.ir/article-1-780-en.html
Hojjat Hasanzadeh Moghaddam1 
, Ali Labafchi1 , Samareh Mortazavi2 , Maryam Khorasanchi1 , Elahe Tohidi2 , Seyed-Hosein Hoseini-zarch2 , Sahand Samieirad * 3
, Ali Labafchi1 , Samareh Mortazavi2 , Maryam Khorasanchi1 , Elahe Tohidi2 , Seyed-Hosein Hoseini-zarch2 , Sahand Samieirad * 3
1- Student Research Committee, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
2- Oral and Maxillofacial Radiology, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
3- Associate Professor, Oral and Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
2- Oral and Maxillofacial Radiology, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
3- Associate Professor, Oral and Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
Abstract: (2411 Views)
BACKGROUND
This study aimed to investigate the positional changes of the hyoid bone following orthognathic surgery in skeletal class III patients.
METHODS
This double-blinded quasi-experimental study was carried out in Mashhad University of Medical Sciences, Iran, from Apr 2019 to Jun 2020. All skeletal Class III patients who were candidates for orthogenetic surgery were included. They underwent mandibular setback surgery using bilateral sagittal split osteotomy. Cephalometric assessments in relation to hyoid bone position and posterior airway space (PAS) were conducted one day preoperatively (T0), as well as one week (T1), six months (T2) and one year (T3) postoperatively, determining the parameters like the Long axis of the hyoid bone (LAH), Retrognation (RGn), Hyoidale (H), Palatal plane (PP), Mandibular plane (MP) and C3 Vertebrae (C3). All cephalograms were examined using AudaxCeph, Planmeca software. The data analysis was performed via SPSS-19
(P<0.05)
RESULTS
25 class III patients, including 18 females (72%) and 7 males (28%) with a mean age of 24.32±5.87, were studied. The cephalometric analysis demonstrated significant decreases in variable angles during the follow-up periods, except for LAH-MP angle (P<0.001). The hyoid bone moved downward and backward relative to its original position following the mandibular setback surgery. However, the bone gradually returned to the preoperative location between 6 to 12 months postoperatively.
CONCLUSION
The findings revealed the downward and backward movement of the hyoid bone following the mandibular setback surgery, returned near to its preoperative position after 1 year, postoperatively.
This study aimed to investigate the positional changes of the hyoid bone following orthognathic surgery in skeletal class III patients.
METHODS
This double-blinded quasi-experimental study was carried out in Mashhad University of Medical Sciences, Iran, from Apr 2019 to Jun 2020. All skeletal Class III patients who were candidates for orthogenetic surgery were included. They underwent mandibular setback surgery using bilateral sagittal split osteotomy. Cephalometric assessments in relation to hyoid bone position and posterior airway space (PAS) were conducted one day preoperatively (T0), as well as one week (T1), six months (T2) and one year (T3) postoperatively, determining the parameters like the Long axis of the hyoid bone (LAH), Retrognation (RGn), Hyoidale (H), Palatal plane (PP), Mandibular plane (MP) and C3 Vertebrae (C3). All cephalograms were examined using AudaxCeph, Planmeca software. The data analysis was performed via SPSS-19
(P<0.05)
RESULTS
25 class III patients, including 18 females (72%) and 7 males (28%) with a mean age of 24.32±5.87, were studied. The cephalometric analysis demonstrated significant decreases in variable angles during the follow-up periods, except for LAH-MP angle (P<0.001). The hyoid bone moved downward and backward relative to its original position following the mandibular setback surgery. However, the bone gradually returned to the preoperative location between 6 to 12 months postoperatively.
CONCLUSION
The findings revealed the downward and backward movement of the hyoid bone following the mandibular setback surgery, returned near to its preoperative position after 1 year, postoperatively.
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