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| Difference of the Upper Airway Morphology and Hyoid Position among Adults with Sagittal Skeletal Malocclusions by CBCT Analysis |
| ZHENG Ying, CAI Xingwei, WANG Yafeng, YANG Yongjin, LI Tao |
| The Teaching Unit at Rocket Force General Hospital of PLA of Jinzhou Medical University, Beijing 100088, China |
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Abstract Objective To investigate the difference of the upper airway morphology and hyoid position among different sagittal skeletal patterns, so as to guide the treatment of micromaxillary deformity and airway disease.Methods Class Ⅰ, Ⅱ, Ⅲ patients with sagittal skeletal malocclusions (30 cases in each) were selected , scaned by CBCT, and Invivo Dental 5 software was used for three dimensional reconstruction. The anteroposterior and lateral dimensions, the cross-sectional areas, length, volume, height of airway and the position of hyoid were measured.Results The total height and length of airway ﹝ (65.83± 7.24) mm, (69.19±7.57) mm respectively﹞in class Ⅱ were greater than those﹝(61.91±7.40)mm,(65.15±6.90)mm respectively﹞in class Ⅰ(P＜0.05) and those﹝(57.75±6.85)mm,(60.14±5.88)mm respectively﹞in class Ⅲ(P＜0.01). The total volume and minimum sectional area of airway were (15.07±2.29)ml, and (171.33±42.67)mm2 respectively﹞in class Ⅱ, and significantly smaller than than those in class Ⅰ﹝(16.53±1.78)ml,(223.83±61.73)mm2 respectively﹞(P＜0.05)and Ⅲ﹝(25.55±2.89)ml,(300.45±64.99)mm2 respectively﹞(P＜0.01). At the same time the Hy-C3Me and Hy-MP had significant differences among class Ⅰ, Ⅱ and Ⅲ groups(P＜0.01).Conclusion Differences of upper airway morphology and hyoid position are statistically significant among adults with different sagittal bones types. Hyoid position moves backward with the movement of mandibular far to next, then airway morphology changes.
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Published: 01 September 2016
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2016, Vol. 34 
