Computer Assisted Design In Double-step Distraction Osteogenesis Of Unilateral Mandibular Segmental Defects Reconstruction

Objective We investigated the feasibility of using computer assisted design in double-step distraction osteogenesis in the reconstruction of mandibular segmental defects after tumor resection. Methods Six cases of unilateral mandibular segmental defects were reconstructed using distraction osteogenesis secondary to oncologic surgery, with the help of computed tomography(CT) and computer assisted design system. The mandibular body was lengthened first, and then the residual defect of mandibular ramus was restored using a distraction device. Results No incidence of infection or other complications were observed. The maximal amount of the lengthening reached 55 millimeter in the mandibular body, and 45 millimeter in the mandibular ramus. The average amount of the lengthening reached 49 millimeter in the mandibular body, and 36 millimeter in the mandibular ramus. The aesthetic and functional result of bone lengthening was excellent in all cases. The retractor was removed after six months. Conclusion Using computer assisted design in double-step distraction osteogenesis in the reconstruction of unilateral mandibular segmental defects has the advantage in precise determination of the focus, planning optimal surgical project and assuring success of operation. It has the disadvantage of a long period for the overall treatment time, thee times of operation and complicated design.