Fig. 4

Surgical simulation and the manufacture of a surgical device for reduction genioplasty. a The two osteotomy lines were established according to the reduction of chin area required. b The gap between the inferior and superior osteotomy lines equaled the thickness of the surgical guide. The distance between the two osteotomy lines dictates the amount 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 two osteotomy lines. d The surgical guide was then computer-rendered. e Reduction of genioplasty was performed in silico, using the surgical guide. f Simulation surgery was confirmed and compared with final surgical plan