Fig. 1

Surgical simulation and the manufacture of a surgical device for advancement genioplasty. a The final osteotomy line was established on the chin of the mandible. The copied, initial osteotomy line was moved superiorly, the displacement equaling the thickness of the surgical guide. b The cut bone segment was moved anteriorly, according to the desired degree of movement required. c The original mandibular data was purged in the displaced segment. The surgical device was designed, after cutting the segment, using the initial osteotomy line. d The surgical guide was computer-rendered. e Advancement of genioplasty was performed with the designed surgical guide. f Simulation surgery was confirmed and then compared with final surgical plan