Abstract：
The relationship between postoperative morphological changes in the inferior nasal cavity and inferior turbinate after Le Fort I osteotomy remains unclear. This study aimed to investigate how the bone volume of the inferior turbinate affects contact with the inferior nasal cavity of patients who underwent superior repositioning. We evaluated the 3-dimensional relationship between the anatomical changes in the inferior nasal passage before and after surgery in 51 patients who underwent Le Fort I osteotomy with an elevation of >4.0 mm in the first molar. The soft tissue and bone volumes of the inferior turbinate and airway volume of the inferior nasal passage were calculated using Proplan CMF 3.0 and compared according to the size of the bone volume of the inferior turbinate. In addition, we reclassified the maxillary movements in the pitch direction and compared the results. The contact rates of the postoperative inferior nasal airway and the inferior turbinate in the large-bone group was 72.3% and that in the small-bone group was 40.0% in the χ2 test. The reduction in the inferior nasal passage volume was significantly greater in the large-bone group (pitch+) than in the small-bone group (pitch+). For patients with well-developed bony tissue of the inferior turbinate, caution is advised if the maxillary elevation is ≥4.0 mm, because the possibility of postoperative obstruction of the inferior nasal passages exist, which may lead to deterioration of nasal ventilation.
摘要：
LeFortI截骨术后下鼻腔和下鼻甲的形态学变化之间的关系尚不清楚。这项研究旨在研究下鼻甲的骨体积如何影响接受了较好的重新定位的患者与下鼻腔的接触。我们评估了51例接受LeFortI截骨术且第一磨牙高度>4.0mm的患者手术前后下鼻道解剖变化之间的三维关系。用ProplanCMF3.0计算下鼻甲的软组织和骨量以及下鼻道的气道体积，并根据下鼻甲的骨量大小进行比较。此外,我们在俯仰方向对上颌运动进行了重新分类，并比较了结果。经χ2检验,大骨组术后下鼻道与下鼻甲的接触率为72.3%,小骨组为40.0%。大骨组（螺距）下鼻道容积的减少明显大于小骨组（螺距）。对于下鼻甲骨组织发育良好的患者，如果上颌标高≥4.0mm，则应谨慎。因为术后存在下鼻道阻塞的可能性，这可能导致鼻腔通气恶化。
