The X-cephalometric Study Of Upper Airway Space And Hyoid Position With Mandible Fracture In Different Parts

Objective:The aim of this study was to analyze the space of the upper airway and changes in hyoid position in different parts of fractures to provide a clinical reference for developing timely and effective treatment programs by measuring lateral skull films in patients with maxillofacial trauma caused by mandibule fractures.Material and Method:1 Subjects: Two groups of patients with single and bilateral condylar fracture were selected respectively, each group consisting of 20 people; two groups with single, bilateral mandibular angle fracture, each group 22 patients; two groups with single, bilateral mandibular body fracture, each group 18 patients; parasymphyseal fracture simple and comminuted fractured groups, each group 30 patients; normal occlusion group with 30 people. Each group is composed of adult males, ages 18 to 35, a total of 210..2 Research Methods: The condylar fracture group, the mandibular angle fracture group, the mandibular body fracture group, parasymphyseal fracture group were compared with normal occlusion group to analyze the space of upper airway and the changes of hyoid position in four kinds of mandible fractures by taking the standard X-ray cephalometry for 210 subjects.Result:Compared with the normal occlusion group:1 Condylar fracture of Group:In unilateral condylar fracture group, H-MP decreased, close to statistical significance, without significant difference (P=0.055). In bilateral condylar fracture group, PAS significantly decreased (P<0.05); H-FH increased, nearing statistically significant difference (P=0.058); H-MP significantly decreased (P<0.05); H-CVP decreased, close to statistical significance (P=0.052); CVT/SN was significantly increased (P<0.05).2 Mandibular angle fracture group: In unilateral angle fracture group, V-LPW decreased, close to statistically significant difference, but no significant difference (P=0.058). In bilateral angle fracture group, V-LPW significantly decreased (P<0.05), CVT/SN significantly increased (P<0.05).3 Mandibular body fracture group: in unilateral body fracture group, V-LPW significantly decreased (P<0.05). In bilateral body fracture group, PAS significantly decreased (P<0.05); V-LPW significantly decreased (P<0.01); H-FH significantly increased (P<0.05); H-CVP and H-S significantly decreased (P<0.05), which indicated a hyoid bone shift backward and downward; CVT/SN significantly increased (P<0.05).4 Parasymphyseal fracture group: In parasymphyseal simple fracture group, H-MP increased (P=0.056), close to statistical significance; H-CVP decreased (P=0.051), close to statistical significance. In comminuted parasymphyseal fracture group, PAS and V-LPW significantly decreased (P <0.05); H-FH and H-MP significantly increased (P<0.05), which showed a hyoid bone displacement backward and downward; H-CVP and H-S significantly decreased (P<0.05), suggesting a hyoid bone backward displacement; CVT/SN significantly increased (P<0.05).Conclusions: The changes of upper airway space with mandibular fractures in different parts were different.1 The upper airway space had no significant changes in unilateral condylar fractures, unilateral mandibular angle fractures, parasymphyseal simple fracture.2 V-LPW narrowed in unilateral mandibular fractures.3 PAS narrowed in bilateral condylar fractures.4 V-LPW narrowed in bilateral mandibular angle fracture.5 The upper airway of bilateral mandibular body fractures and parasymphyseal comminuted fracture, especially PAS and V-LPW significantly narrowed, which consequently affected the ventilation function in patients.