Abstract: Objective: To guide the genioplasty and illustrate its feasibility and validity by a new 3D printing template. Methods: Twelve patients with microgenia deformities were included. The mean age at the time of surgery was 22.6 years (range 18-27 years). Cone beam CT scan was used for each patient to create a 3D mandibular model. The templates were designed in 3-matic 8.0 software and manufactured via 3D printing technique. Results: All patients were operated with the novel method successfully without plate break or deformity. Compared to preoperative virtual position, the actual central point movement distance was (0.12±0.27) mm coronally, (-0.57±0.18) mm sagitally, and (-0.22±0.36) mm perpendicularly, respectively. The angular of pitch, roll, and yaw were (2.14±1.02)°, (0.45±0.64)°, and (0.24±0.17)°, respectively. There was no significant difference statistically. Conclusion: This templates system provides a reliable method for transfer of genioplasty planning.The operation precision of the genioplasty can be improved by using the surgical templates system and better outcome can be available.

Key words: Genioplasty , Computer simulation, Three dimensional printing