Aim: This research was planned with the idea that the first problem for implants longevity is occlusion for the dentures supported by osseointegrated implants for edentulous patients. It was aimed to research various occlusions so as to minimize the stresses on the implants by reducing the cusp impaction of different prosthetic restorations by using finite element method. Method: Pseudo three dimensional mathematical model of consisting 6 ITI solid-srew type implants of 14mm lengths were positioned between mental foramens in the mandible consiting of bilateral cantilevers. Totally 600 N of lateral force has been loaded separately on the five different cusps as 120 N on each in order to investigate the group function occlusion and for the mutually protected occlusion disforce has been applied on to one cusp as 600 N. Results: As a result, all the force that has been applied for the mutually protected occlusion created approximately three times more stress at the working side of mandible, although this stress has been distributed homogenously in group function occlusion. Conclusion: For both type of occlusions, the distal cervicals of the third implants were the critical sections for the shear stresses. The results of the stresses that has been evaluated in both occlusions at the spongy bone were found mathematically close to each other.

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