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objective: This study was conducted to evaluate the bone changes that may occur around Legacy I implants and NanoTite Tapered implants supporting mandibular overdentures utilizing cone beam computed tomography (CBCT). materials and methods: Fourteen completely edentulous male patients were randomly divided into two equal groups. Group I: Each patient received two Legacy I implants. Group II: Each patient received two NanoTite Tapered Implants. All implants were inserted bilaterally in the mandibular canine region. For all patients conventional complete dentures were constructed before implants placement. After complete osseointegration of implants, dome shaped healing collars were screwed to the implants upon which mandibular overdentures were fitted. Once patients were comfortable to the prosthesis, they were placed on a zero, six, and twelve months follow-up periods. Radiographic evaluation of peri-implant bony changes was made using CBCT. Measurements were taken for bone density and crestal bone height surrounding the implants. results: Both groups showed reduction in the crestal bone height however, Legacy I implants showed more bone resorption than NanoTite tapered implants. While bone density measurements showed statistically non-significant difference between the two groups. conclusion: NanoTite Tapered Implant System is more compatible with crestal bone height however, regarding bone density there is no difference between using NanoTite Tapered Implant System and Legacy I Implant System in cases of implant-retained mandibular overdenture.