Three-dimensional evaluation of changes in the upper airway,natural head position and hyoid bone position in skeletal Class Ⅲ patients after bimaxillary surgery
10.13591/j.cnki.kqyx.2024.08.007
- VernacularTitle:双颌手术后骨性Ⅲ类患者上气道、自然头位和舌骨位置变化的三维评估
- Author:
Yao ZHENG
1
,
2
;
Shaoyang YU
;
Wenli HUANG
;
Lirong DONG
;
Qiang ZHANG
;
Xiao YUAN
Author Information
1. 青岛大学附属医院口腔正畸科,山东青岛(266003)
2. 青岛大学口腔医学院,山东青岛(266023)
- Keywords:
upper airway;
skeletal Class Ⅲ;
bimaxillary surgery;
cone-beam computed tomography
- From:
STOMATOLOGY
2024;44(8):590-595
- CountryChina
- Language:Chinese
-
Abstract:
Objective To assess short-and long-term changes in the upper airway,natural head position and hyoid bone position in skeletal Class Ⅲ patients after bimaxillary surgery.Methods In this retrospective study,the cone-beam computed tomography(CBCT)of skeletal Class Ⅲ patients was taken before surgery(T0),3 months after surgery(T1)and 2 years after surgery(T2).Three-dimensional images were created to assess postoperative changes and the correlation between the upper airway,natural head posi-tion and hyoid bone was analyzed.Results Thirty skeletal Class Ⅲ patients(13 men and 17 women)who underwent bimaxillary sur-gery with a mean(SD)age of 21 years(a range of 17-30 years)were evaluated.A significant decrease was observed in the volume of palatopharynx,glossopharynx and total airway after T1 and T2.There was a significant correlation between changes in the position of the mandible and changes in the volume of the upper airway(P＜0.05).The NSL/OPT angle and the NSL/CVT angle were greater after Tl and T2.The change in the NSL/CVT angle was positively correlated with the change in palatopharyngeal and glossopharyngeal volume(P＜0.05).Conclusion Bimaxillary surgery may cause a decrease in upper airway volume,an increase in the cranio-cervical angle,and a downward and backward movement of the hyoid bone.Changes in the cranio-cervical angle may cause changes in the upper air-way.
