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目的:应用锥形束CT(CBCT)测量成人骨性Ⅱ类错患者口咽气道形态特征,分析上下颌骨的位置对气道的影响,为正畸临床评估骨性Ⅱ类错患者气道三维结构,制定合理有效的治疗方案提供指导。方法:筛选CBCT资料,按纳入标准分为骨性Ⅱ类下颌后缩组和上颌前突组,以骨性Ⅰ类错为对照组(各40例),采用Invivo 5软件测量相关指标并对数据进行统计分析。结果:在气道各段截面积、体积、矢状径、冠状径、气道角度及舌骨位置等测量项目上,骨性Ⅱ类下颌后缩组相对于骨性Ⅱ类上颌前突组及骨性Ⅰ类组有较显著的统计学差异(P<0.05)。骨性Ⅱ类下颌后缩患者明显呈现狭长、向后倾斜的口咽气道形态,而骨性Ⅰ类患者气道形态更为直立,且骨性Ⅱ类下颌后缩患者口咽气道截面最狭窄。结论:成人不同骨性错畸形口咽气道三维特征不同,下颌骨矢状位置、长度较上颌骨对口咽气道形态影响更为显著。
OBJECTIVE: To evaluate the orographic characteristics of oropharyngeal airway in adult patients with skeletal Class Ⅱ malocclusion by cone beam computed tomography (CBCT), analyze the influence of upper and lower jaw position on the airway, and evaluate the effect of orthodontic on patients with skeletal Class Ⅱ malocclusion Road three-dimensional structure, to develop a reasonable and effective treatment programs to provide guidance. Methods: The CBCT data were screened and divided into skeletal class Ⅱ mandibular retrusion group and maxillary protrusion group according to the inclusion criteria. The skeletal class Ⅰ malocclusion group was used as the control group (40 cases each). Invivo 5 software was used to measure the related indexes Data for statistical analysis. Results: In the measurement items of cross-sectional area, volume, sagittal diameter, coronal diameter, airway angle and hyoid position in each section of airway, The skeletal class Ⅰ group had statistically significant difference (P <0.05). Ossification of the skeletal Class Ⅱ mandibular rectum showed a slender, backward tilted oropharyngeal airway morphology, whereas the skeletal Class Ⅰ patients had a more upright airway shape, and the skeletal Class Ⅱ mandibular retrusion had the narrowest oropharyngeal airway cross-section. CONCLUSION: The three-dimensional characteristics of oropharyngeal airway in adult patients with different skeletal malformations are different. The sagittal position and length of the mandible are more significant than those in the maxilla.