Objective: the object of this study was to evaluate stresses induced on implant supported ‎cobalt chromium and nylon overdenture bases in free end saddles cases using photoelastic ‎stress analysis. Materials and Methods: Ready-made mandibular stone cast fabricated ‎according to Kennedy Class I with missed 2nd premolar, 1st and 2nd molars. Implant analogue ‎was inserted at site of first molar by using milling machine. Closed tray silicone impression ‎was taken to the stone cast after transfer coping insertion. The transfer coping was inserted on ‎its place in the impression. The implant was placed on its position in the impression. The ‎impression was poured by epoxy resin material and left 24 hour for complete setting. Metallic ‎denture base and nylon denture base was constructed in same design. Forces of 20N, 40N, ‎‎60N, 80N, 100N were applied to detect photoelastic stresses. Results: at application of loads ‎‎(80N and 100N) the nylon framework recorded higher stress values than that of vitalium ‎framework at apical, middle and cervical area for left and right sides. Conclusion: Cobalt ‎chromium denture base showed better stresses distribution in comparison to nylon denture ‎base.‎