关键词: 下颌骨, 髁突骨折, 螺旋CT, Mapping技术, 三维形态学

Abstract:

Objective Through three-dimensional morphological analysis of the distribution of three-dimensional fracture lines of mandibular condylar fractures, the distribution and alignment characteristics of condylar fractures were revealed, in order to provide re-ference for diagnosis and treatment and surgical plans in maxillofacial surgery. Methods The imaging data of 37 cases of mandibular condylar fractures undergoing spiral CT examination were selected for retrospective analysis. The spiral CT image data of the patients were imported into Mimics and 3-matic software to isolate, model and simulate the repositioning of the mandibular fracture block, and the fracture lines were copied on a healthy standard mandibular model to obtain the distribution map of the condylar fracture lines. Results The coronal condylar fracture had an oblique alignment, with no obvious fracture line in the superior interior and no obvious difference between the right and left lateral condylar fracture lines;the horizontal condylar fracture line had an external high and internal low alignment around the condylar neck, with a markedly reduced fracture line in the superior interior. Conclusion By analyzing the condylar fractures and using 3D Mapping technology, it was concluded that condylar fractures were mainly concentrated in the lateral aspect of the condyle accompanied by fracture fragments and detachment from the condylar process, which often required surgical threaded nail fixation. 3D Mapping technology could be used to provide preoperative virtual guidance on the angle, direction, and length of threaded nails, which could provide a direction to improve surgery accuracy.

Key words: mandible, condylar fracture, spiral CT, Mapping technology, three-dimensional morphology