Implant overdenture treatment is a popular line of treatment in edentulous patients where a hybrid implant-supported bridge is unsuitable. Telescopic attachment is considered one of the successful type of attachment used in overdenture patients. This study is conducted to clarify the value of using Calcium Carbonate graft material to enhance osseointegration and peri-implant bone. Zirconia was used as telescope material prepared by CAD CAM technology to maximize quality of attachment used. Ten completely edentulous male patients were selected according to predetermined criteria to receive twenty root-form endosseous implants (Protem/secure implant systemDio implant Dio corporation 1464, U-dong Haeundae-gu Busan, Korea) at the mandibular canine areas. As a within subject study, implants were categorized into two groups, graft material received group and control group. Overdentures were constructed after incorporating the telescopic attachment and finally the peri-implant bone was monitored using cone-beam CT (CBCT) at loading time, after 3, 6, and 12 months to measure the amount of marginal bone height loss and quality change around each implant. The results showed improvement in both peri-implant bone height and quality. Accordingly, within the limitation of the present study, the use of Calcium Carbonate graft material is an effective measure to enhance and stabilize peri-implant bone in implant overdenture patients.