Abstract: Objective: To evaluate th

Abstract: Objective: To evaluate the presence of upper airway stenosis in patients with bilateral anterior disc displacement, and to further demonstrate the relationship between temporomandibular 10 joint, airway, and hyoid bone. Methods: 64 patients with bilateral anterior disc displacement shown by CBCT in the joint specialty of Stomatological Hospital of Lanzhou University from June 2020 to August 2021 were selected as the patient group, 65 patients with normal joints diagnosed by arthrologists were selected as the control group. The included patients were 18-44 years old, with normal BMI index and skeletal class I. The number of patients with high angle and low angle in the 15 experimental group was the same as that in the control group. First, Dolphin11.8 was used to measure joint space, airway volume, and cross-sectional area. It also reconstructed lateral cranial radiographs were used to measure the parameters of the mandibular and hyoid bone. last, we analyzed the correlation. Results: There was no difference in segmentation parameters among all patients. In patients with bilateral anterior disc displacement, the airway is narrow, the mandible retracts, and the hyoid 20 bone is lower and more posterior. The linear ratio of condylar sagittal position （LR） was correlated with the airway volume of palatopharynx and glossopharynx, and with the length of the mandibular body and the sagittal position of mandible. Conclusions: Patients with bilateral anterior disc displacement and patients with OSAHS show similar changes in the position of mandible and hyoid bone. When meeting patients with joint problems, stomatologists should pay attention to asking them 25 whether they have problems with airway obstruction.Key words: TMD, airway, mandible, hyoid, correlation analysis