关键词: 数字化外科技术, 3D打印技术, 下颌骨重建

Abstract: Objective　To evaluate the clinical effect of digital surgical technique in mandibular defect repair. Methods  From July 2018 to June 2019，8 patients with mandibular tumor or cyst were treated in Xuzhou Central Hospital and they were selected. Preoperative Three dimensional CT of jaw and CT angiography（CTA）of lower limbs were performed in all patients. Computer software（Mimics 8.11）was used to design the osteotomy range of the mandibular lesions and to reconstruct the mirror image of the defects. The osteotomy and plastic guide plate were printed by 3D printing technology，and the pre-bending titanium plate was reconstructed according to the printed mirror image of the mandible model. Mandibular resection，vascularization of fibular musculocutaneous flap and immediate repair of mandibular defect were performed according to osteotomy and plastic guide plate during the operation. Postoperative facial shape，degree of mouth opening and occlusal relationship of the patients were evaluated，and osteosynthesis and condyle position were evaluated based on the imaging information. Results    All patients healed at stage Ⅰ and all the grafted vascularized fibular musculocutaneous flaps survived. The facial shape of the patients gradually recovered to symmetry，the occlusal relationship was good，and the degree of mouth opening was restored to 3.0 - 3.8 cm. The condyles of the patients without mandibular extension or condyle involved were all located in the fossa，and the discocondyle relationship was acceptable. The fibula combined well with the mandible without abnormal bone resorption. Conclusion    Digital surgical technique is effective in repairing mandibular defects and it is recommended to be applied in clinic.

Key words: digital surgical technology, 3D printing technology, reconstruction of the mandible