Finite element analysis of stress behaviour in a novel implant platform under axial and non-axial loading conditions-an in vitro study

Background & Rationale: The most common technical complication observed in a dental implant prosthesis post-opera-tively, is screw loosening and occasionally, screw fracture. The aim of this study is to develop a novel implant-abutment connection which eliminates the use of a prosthetic screw and to evaluate the stress response of this novel connection under axial and non-axial loads simulating the mechanical loads present intraorally. Materials & Methods: Three dimensional models of implants with the conventional platform and the new bayonet mount platform were designed. The stress behaviour of the two models were evaluated using finite element analysis under axial and non-axial loading conditions. Results: Von Mises stresses are higher in the new model in the platform region of the implant fixture. Stress levels were maintained well below the yield limit for the new model under all loading conditions while the conventional design exceeded the yield limit for cortical bone under non-axial loading and in the fastening screw under all loading conditions. Conclusion: Despite the limitations of the method, it can be observed that the bayonet mount can serve as a suitable alternative implant-abutment connection in commercial implant systems. Further studies need to be performed to evaluate the feasibility of incorporating this platform design in commercial dental implants.