Hasanzadeh Moghaddam Hojjat, Labafchi Ali, Mortazavi Samareh, Khorasanchi Maryam, Tohidi Elahe, Hoseini-Zarch Seyed-Hosein, Samieirad Sahand
Student Research Committee, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Oral and Maxillofacial Radiology, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran.
World J Plast Surg. 2021 May;10(2):46-54. doi: 10.29252/wjps.10.2.46.
This study aimed to investigate the positional changes of the hyoid bone following orthognathic surgery in skeletal class III patients.
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 (<0.05).
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 (<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.
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.
本研究旨在调查骨性III类患者正颌手术后舌骨的位置变化。
本双盲半实验性研究于2019年4月至2020年6月在伊朗马什哈德医科大学开展。纳入所有适合正颌手术的骨性III类患者。他们接受了双侧矢状劈开截骨术进行下颌后缩手术。术前一天（T0）以及术后一周（T1）、六个月（T2）和一年（T3）进行了与舌骨位置和后气道间隙（PAS）相关的头影测量评估，确定舌骨长轴（LAH）、后缩（RGn）、舌骨点（H）、腭平面（PP）、下颌平面（MP）和第三颈椎（C3）等参数。所有头影测量片均使用AudaxCeph、Planmeca软件进行检查。通过SPSS-19进行数据分析（<0.05）。
研究了25例III类患者，包括18例女性（72%）和7例男性（28%），平均年龄为24.32±5.87岁。头影测量分析显示，随访期间除LAH-MP角外（<0.001），各变量角度均有显著下降。下颌后缩手术后，舌骨相对于其原始位置向下和向后移动。然而，术后6至12个月骨逐渐恢复到术前位置。
研究结果显示下颌后缩手术后舌骨向下和向后移动，术后1年接近术前位置。
