Fig. 4

Preoperative performance and computer simulation of patients, model of rapid prototyping by 3D printer, one-stage repair of mandibular defect by CAD/CAM technique, and the follow-up of CAD/CAM assisted individualized repair of complex segmental defects in mandible. a The scope of invasion (transverse section); b The range of simulated surgical excision; c Osteotomy range and repair of simulated fibula flap; d Customize the osteotomy plate according to the model after the rapid prototyping, determine the interception range and location of the fibula; e Pre-bending of titanium plate according to the model after rapid prototyping; f The condition of mandible defect in patients with equal proportions; g The right fibula and osteotomy area of the equal proportions of the patients. h Expanded resection of tumor shows the area to be repaired; i The range of segmental resection of the mandible in the process of enlarged tumor resection is consistent with the preoperative simulation; j Preparation of free fibula flap according to the osteotomy plate model; k Repair of the defect area with free fibula flap and fixed with preformed titanium plate; l Three dimensional reconstruction of CT scan in patients with postoperative lesions and repair and reconstruction; m The degree of occlusion was good and the function of the temporomandibular joint was normal