ABSTRACT
<p><b>OBJECTIVE</b>To improve the accuracy and safety of the Le Fort I osteotomy.</p><p><b>METHODS</b>Eighty-four patients underwent CBCT scan before maxillary orthognathic surgery. The anatomic structures of maxilla were marked and measured.</p><p><b>RESULTS</b>In 84 cases, there were 3 cases with severe hypoplasia of maxillary sinus, 11 cases with impacted third molar, 8 cases with separation in maxillary sinus, 4 cases with the deviation of nasal septum, and 3 cases with cysts in maxillary sinus. Form CBCT images, the position of the pterygopalatine canal, the thickness of maxillary wall, hidden lesion of maxillary sinus, the location of Impacted molar, the deviation of nasal septum, and other anatomic structure could be accurately localized. CBCT could provide sufficient and valuable information in diagnosis and design for Le Fort I osteotomy.</p><p><b>CONCLUSIONS</b>CBCT imaging technology could provide precise anatomic images for Le Fort I osteotomy. It improves the accuracy and safety of the Le Fort I osteotomy.</p>