Aim of the study: This work is to biologically and radiographically evaluate the implant supported distal extension partial overdenture corrected by altered cast impression technique and functional relining technique.Biological evaluation: Gingival index, Total Protein measurements: Gingival fluid around the abutment, Implant exudate around the implant.Radiographic evaluation: Crestal bone level around the implant, Bone density around the implant.Material and methods: Patients were divided into two groups according to the method of adaptation of the distal extension part : -first group patients has received partial overdenture done with altered cast impression technique.-second group patients has received the partial denture with functional relining of the finished denture method. Evaluation: Baseline measurements (at the time of the insertion of the prosthesis): Biological evaluation : Gingival index (GI) at teeth and implants, Gingival fluid measurement around the abutments, Implant exudates measurement around the implants.Radiographic evaluation: Crestal bone level around the implant, Bone density around the implant, Biological parameters was repeated at 3, 6 and 9 months intervals (after loading) and compared to the base line measurements. Radiographic parameters were repeated at 6 and 9 months (after loading) period of follow and will be compared to the base line measurements.Results: the study result resulted that there were no statistically significant difference between the two groups through all the parameters. Conclusions: The result conculded that treating patients with implant supported partial overdenture is considered a successful treatment approach. There is no significant difference between the two groups through all the parameters.