Implant retained overdenture is a popular treatment for edentulous patients whether splinted or solitary attachments were used. The aim of the study was to examine the difference between bar and telescopic overdenture attachment fabricated from zirconia. Ten male patients were selected to receive implant overdenture retained by two implants at para-sympheseal zone. These patients were categorized into two groups based on the type of attachment used. Group (A) was the barconnected group while group (B) was the telescopic attachment group. Both bone height and bone density were monitored, using cone beam computerized tomography, throughout the follow up periods (at loading time, three, six and twelve months). The results showed the mean values of peri-implant bone height loss of group A were less than group B with statistically significant values (P< 0.05). The mean values of the bone density showed higher bone density values in group A than group B with statistically significant value at (P < 0.05). It could be concluded that the zirconia bar-attachment overdenture showed better treatment outcomes than zirconia telescopic attachment. Accordingly, the bar-clip attachment system showed some preference in preserving peri-implant bone surround the implants.
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