Abstract: PURPOSE: Applying geometric simulation and finite element analysis to an unilateral mandibular defect reconstructed with rib graft to evaluate the biomechanical properties and guide the implant restoration for this kind of mandibular defect. METHODS: A geometric and finite element analysis mechanic model of mandibular defect reconstructed with rib graft based on CT scan and graphic processing technique was established. Computer-aided simulation of implantation and finite element analysis were carried out to meet the prosthetic requirement. The feasibility and biomechanical properties of this design were also evaluated. RESULTS: Implant restoration on mandibular defect reconstructed with rib graft was feasible. The implant could be inserted perpendicularly to the rib graft and the stress after implantation was concentrated on the mesial aspect of the left mandibular second premolar area. At the later stage, a prosthetic restoration should be applied to adjust the occlusal relationship. CONCLUSIONS: The accuracy and success rate of an implant restoration on a mandibular defect reconstructed with rib graft can be raised via preoperative design of the location and angulation of implants aided by CT scan, graphic processing technique, biomechanical analysis, as well as stress reduction by prosthetic fabrication and occlusal adjustment at the later stage.

Key words: Mandibular defect, Rib graft, Three-dimensional finite element, Stress analysis, Implant restoration