Cheung L K, Fung S C, Li T, Samman N
Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Hong Kong, Hong Kong.
Int J Oral Maxillofac Surg. 1998 Oct;27(5):346-51. doi: 10.1016/s0901-5027(98)80062-3.
The most common site of haemorrhage in maxillary osteotomies is the posterior maxilla. Better understanding of the anatomy in this region may minimize possible vascular complications. The aim of the study was to study the osteology of the posterior maxillary region and establish clinical safety guidelines for the Le Fort I osteotomy Thirty human dry skulls were selected and assessed by a combination of direct inspection, computerized imaging and computed tomography (CT) scan analysis. Results showed that the presence of maxillary third molars influenced the transverse angulation of the posterior vertical cut. Synostosis of the pterygomaxillary junction was noted in 12% of samples. The mean length of the medial sinus wall from the piriform rim to the descending palatine canal at the Le Fort I level was 34 mm. The three-dimensional CT-reconstructed descending palatine canal ran at 60 degrees anteroinferiorly to the palatine plane and slightly medially to the exit through the greater palatine foramen.
上颌骨截骨术中最常见的出血部位是上颌后部。更好地了解该区域的解剖结构可能会将潜在的血管并发症降至最低。本研究的目的是研究上颌后部区域的骨学，并为Le Fort I型截骨术制定临床安全指南。选择了30个干燥的人类颅骨，通过直接检查、计算机成像和计算机断层扫描（CT）扫描分析相结合的方式进行评估。结果显示，上颌第三磨牙的存在影响了后垂直切口的横向角度。在12%的样本中发现了翼上颌连接的骨性融合。在Le Fort I水平，从梨状缘到腭降管的内侧窦壁平均长度为34毫米。三维CT重建的腭降管向前下与腭平面呈60度角，且略向内侧通向腭大孔的出口。
