Research of different prosthetic designs on dental implants from the point of stress distribution in edentulous mandibuler case by using the method of finite elements stress analysis

In this study,the amount and the area of stress fields generated on implants and bone which arise from incoming forces of four different prosthetic designs on four implants placed in fully edentulous mandible are examined by 3 dimensional finite elements analysis.In our study we prepared four dimentional finite element models representing distal extension mandibular removable partial denture connected to an anterior fixed implant-supported prosthesis, ball retained mandibular overdenture and bar retained mandibular overdenture built over 4 implants. 100 N vertical and 100 N oblique forces from the center of the first mandibular molar teeth were applied on each model. The stress was investigated by using the Algor Pempro programme.While the Stress values were being compared within the limits of our study the highest stress value was seen in the ball design overdenture of the posterior implants and surrounding bone were retained overdenture.On the other hand the lowest stress value occured in the design of the implant bar overdenture. As the implant fixed partial denture prothesis were compared with precision attachments connected to the posterior it was seen that attachments connected to a fixed prosthesis on implants moving the posterior part of dentures Ceka design?s stress values were higher than Bredent dentures design?s. Stresses are concentrated at the level of cortical bone.