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Three-dimensional study of the upper airway in different skeletal Class II malocclusion patterns

机译：不同骨骼II类错牙合畸形上呼吸道的三维研究

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Objectives: To characterize upper airway volume and morphology in patients with different skeletal patterns of Class II malocclusion compared to Class I. Materials and Methods: A total of 197 individuals who had cone-beam computed tomography were allocated into groups according to ANB, SNA, and SNB angles (Class I, Class II maxillary protrusion, Class II mandibular retrusion), each subdivided into hypodivergent, normal, and hyperdivergent. Nasopharynx (NP), oropharynx (OP), and hypopharynx (HP) were assessed with three-dimensional image reconstruction software. Results: Intergroup comparison did not detect significant differences in volume and morphology of NP, OP, and HP. The males displayed larger OP and HP volume than the females. Positive correlations between age and NP, OP, HP volume and between craniocervical angle and OP and HP volume were observed. Linear regression analysis detected a tendency for OP and HP volume to increase as maxillary and mandibular length increased. Conclusions: Upper airway volume and morphology were similar in different skeletal patterns of Class II malocclusion. Actual upper and lower jaw lengths were more closely related to upper airway volume and morphology than the angles that reflected their position relative to the cranial base.
机译：目的：鉴定与II类相比具有II类错牙合的不同骨骼模式的患者的上呼吸道容积和形态。材料与方法：根据ANB，SNA，和SNB角（I类，II类上颌前突，II类下颌骨后缩），每个细分为低散，正常和超散。用三维图像重建软件评估鼻咽（NP），口咽（OP）和下咽（HP）。结果：组间比较未发现NP，OP和HP的体积和形态有显着差异。雄性显示出比雌性更大的OP和HP量。观察到年龄与NP，OP，HP量以及颅颈角与OP和HP量之间呈正相关。线性回归分析检测到OP和HP量随上颌和下颌长度增加而增加的趋势。结论：II类错牙合的不同骨骼形态的上呼吸道容积和形态相似。实际上颌和下颌的长度与上呼吸道容积和形态的关系更密切，而不是反映它们相对于颅底位置的角度。

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