Abstract: For oral surgery of dislocated fracture jaw reconstruction, a broken jaw reconstruction method is presented to help doctors for preoperative planning and preparation. Firstly, marching cube algorithm is used to extract facet model from patient’s CT image data, then a sketch-based interactive segmentation method, which combines graph cut algorithm and SDF descriptor and Gaussian mixture models, is presented to allow doctors to segment broken jaw rapidly by simple strokes; at last reconstruction is realized automatically based on the craniofacial symmetry. This method accomplishes reconstruction by reposition of broken jaw so that it can fully keep important fracture information for doctors. The method has been applied in self-developed jaw reconstruction system; patient data from The First Affiliated Hospital of Anhui Medical University has been used for testing, the result demonstrates the effectiveness of this approach.

Key words: computer aided surgery, jaw reconstruction, mesh segmentation, symmetry detection