Aim of the study This study assessed prosthetic maintenance and complications over a one-year period for three different construction Co-Cr bar-retained implants overdenture prosthesis. Three different types of Co-Cr construction bars: conventional casting, milling CAD/CAM techniques, and 3D printing CAD/CAM techniques. Material and methods Thirty edentulous patients who needed bar-retained implants for mandibular overdentures were randomly assigned to one of three groups. Group I, consisting of 10 patients, received a Co-Cr conventional casting bar; Group II, also with 10 patients, received a Co-Cr CAD/CAM milled bar; and Group III, with 10 patients, received a Co-Cr CAD/CAM 3D-printed bar. All bars were attached between two implants located bilaterally in the canine region. Patients received their definitive prostheses within two weeks following implant placement. Prosthetic maintenance and complications were evaluated at 3, 6, and 12 months. The results were collected, tabulated, and statistically analyzed. Results Thirty patients participated in this study, with a total of sixty implants inserted-two implants in the canine area on both sides for each of the 30 edentulous patients. The prosthetic maintenance was a statistically significant difference between the three groups regarding the need for replacement of retentive component (P-value = 0.003). The conventional bar group showed the highest percentage of need for replacement of retentive component followed by milled bar group while 3D printed bar group didn’t need replacement of retentive component. Conclusion. The conventional bar group had the highest percentage of cases requiring retentive component replacement, followed by the milled bar group, whereas the 3D printed bar group did not require any replacement of the retentive component