Khalil Rehab A, Salem Walid S
Department of Orthodontics, Faculty of Dentistry, Beni-Suef University, Beni-Suef, Egypt.
Department of Oral Radiology, Faculty of Dentistry, Beni-Seuf University, Beni-Suef, Egypt.
Int Orthod. 2025 Mar;23(1):100936. doi: 10.1016/j.ortho.2024.100936. Epub 2024 Oct 29.
This study aimed to assess the changes in the pharyngeal airway morphology after premolar extraction and maximum anchorage retraction of the anterior segments in adult bimaxillary protrusion patients by using CBCT.
Twenty-one subjects (mean age 23.8±4.6 years) requiring extraction of four first premolars and en masse retraction of the anterior segments using maximum anchorage participated in the study from July 2022 to May 2024 with an average treatment duration of 19.9 months. CBCT scans were taken before treatment (pre) and after en masse retraction (post). Airway volume was measured by using Relu software. The pre- and post-CBCT scans were superimposed by using Romexis 1 software. The cross-sectional area (CSA) was measured at the level of the hard palate, soft palate, and epiglottis. The most constricted area (MCA) was recorded. The hyoid bone position was evaluated by using 5 linear measurements. The upper and lower incisor angulations to the Frankfort horizontal plane (FH) were measured before and after retraction. Paired t-test was used to analyse the measurements and correlation analyses were made using Spearman's rank-order correlation coefficient (rs). The significance level was set at P<0.05 within all tests.
Twenty-one participants (16 females, 5 males) followed the inclusion criteria and enrolled in the analysis. There were no significant differences in airway volume, cross-sectional areas, or hyoid bone position between before treatment and after en masse retraction (P>0.05). There was a significant retraction of the incisors after treatment (P<0.001). The change in the most constricted area had a large positive correlation with the change in the airway volume (rs=0.509*) and the area of the soft palate (rs=0.653*).
Maximum anchorage retraction had no significant effect on airway volume, cross-sectional area, or hyoid bone position.
本研究旨在通过锥形束计算机断层扫描（CBCT）评估成年双颌前突患者拔除前磨牙并采用强支抗内收前牙段后咽气道形态的变化。
2022年7月至2024年5月，21名（平均年龄23.8±4.6岁）需要拔除四颗第一前磨牙并采用强支抗整体内收前牙段的受试者参与了本研究，平均治疗时长为19.9个月。在治疗前（pre）和整体内收后（post）进行CBCT扫描。使用Relu软件测量气道容积。使用Romexis 1软件对治疗前和治疗后的CBCT扫描进行叠加。在硬腭、软腭和声门水平测量横截面积（CSA）。记录最狭窄区域（MCA）。通过5项线性测量评估舌骨位置。测量内收前后上下切牙与法兰克福水平面（FH）的夹角。采用配对t检验分析测量结果，并使用Spearman等级相关系数（rs）进行相关性分析。所有检验的显著性水平设定为P<0.05。
21名参与者（16名女性，5名男性）符合纳入标准并纳入分析。治疗前与整体内收后在气道容积、横截面积或舌骨位置方面均无显著差异（P>0.05）。治疗后切牙有显著内收（P<0.001）。最狭窄区域的变化与气道容积变化（rs=0.509*）和软腭面积变化（rs=0.653*）呈显著正相关。
强支抗内收对气道容积、横截面积或舌骨位置无显著影响。
