64 row spiral ct

A preoperative craniofacial CT scan (64-row spiral CT; Philips) was performed. The CT data were imported into the digital design software platform ProPlanCMF 3. 0 (Materialise) for the 3D reconstruction of the skull (Fig. 1A–C). Osteotomy and shaping were performed in the 3D model to determine the osteotomy path, movement direction, and distance. In addition to the extent of the deformity of the skull, the osteotomy path also takes into account the intracranial malformation of the bony crest and the intracranial brain tissue. By trying different planes on the 3D model, the most suitable osteotomy plane can be determined. After that, the final ORH osteotomy guide was printed by a 3D printer (Objet 30; Stratasys) using photosensitive resin. In addition, a 1:1 plaster model of the skull can be printed by a 3D printer (Z Printer 350; 3D System) (Fig. 1D). The osteotomy guide can be placed on the model before surgery to draw the osteotomy line and perform a surgical simulation of osteotomy on the model to verify the suitability of the produced guide.