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利用X线头影测量技术，对28例骨性下颌前突症患者接受下颌后退术后的咽腔气道改变进行研究，手术方法均为坚固内固定的下颌升支矢状劈开术（RIF－SSRO）。结果表明：（1）RIF－SSRO可导致患者咽腔气道的宽度和面积显著减小（P＜0.01），咽腔气道的缩小以咽腔下部最为突出。（2）RIF－SSRO术后5～12月，咽腔气道的缩小有不同程度地回复，但均未达到术前水平（P＜0.01），提示RIF－SSRO术后患者咽腔气道的缩小可能是永久性的。（3）下颌骨的后退量与咽腔气道变化之间没有明显的相关关系。（4）RIF－SSRO术后复发十分微小，并且气道变化的大小与术后复发之间没有明显的相关关系。（5）尽管RIF－SSRO可使咽腔气道发生明显缩小，并且可能为永久性的，然本研究所有病例术后均未出现睡眠呼吸暂停综合征症状，提示手术造咸的环境改变所引起的舌骨、舌、咽腔及颈部等相关肌肉的功能性反射性再调节机制，可能对于患者咽腔气道的维持发挥了重要作用。
28 cases of patients with mandibular prognathism underwent mandibular retrogressive pharyngeal airway changes were studied by X-ray cephalometric technique. The surgical methods were rigid internal fixation of mandibular ascending ramification sagittal split (RIF- SSRO). The results showed that: (1) RIF-SSRO could significantly reduce the width and area of the pharyngeal airway (P <0.01), and the narrowing of the pharyngeal airway was the most prominent in the pharyngeal cavity. (2) In 5 ~ 12 months after RIF-SSRO, the narrowing of the pharyngeal airway responded with different degrees, but they did not reach the preoperative level (P <0.01), suggesting that the pharyngeal airway Shrinking may be permanent. (3) there is no obvious correlation between the amount of retreat of mandible and the change of pharyngeal airway. (4) The recurrence after RIF-SSRO was very small, and there was no significant correlation between the size of airway changes and postoperative recurrence. (5) Although RIF-SSRO significantly reduced pharyngeal airways and may be permanent, none of the patients in this study developed symptoms of sleep apnea syndrome, suggestive of a change in the environment caused by surgery The functional reflex re-adjustment mechanism of the hyoid bone, tongue, pharynx, neck and other related muscles may play an important role in the maintenance of pharyngeal airway in patients.