Abstract: Objective　To discuss the methods and efficacy of digital guide to assist accurate reduction and fixation of mandibular comminuted fracture. Methods 10 patients of mandibular comminuted fracture from January 2016 to December 2017 were involved. Preoperative design was made by digital technology and surgery guides were manufactured using 3D printer. By means of surgery guides, mandibular comminuted fractures were fixed with reconstruction titanium plate in surgery. Image fusion and clinical evaluation were conducted to investigate treatment after surgery. Results Primary healing was obtained in all patients. Image fusion showed a less-than-2mm deviation. Occlusion relation recovery and reduction of fracture were in good condition, and nothing abnormal was detected in the mouth opening. Conclusion Surgery guide can shorten the operation time, precisely restore mandibular comminuted fractures and has definite clinical application efficacy.

Key words: surgery guides , 3D printing , mandiblular comminuted fracture, precision