الفهرس 
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Abstract
To evaluate the clinical and radiographic outcomes after implant placement over one year follow up in patients with a history of chronic periodontal disease. Patients and Methods: Patients previously treated for chronic periodontitis were involved in the study. They were classified into 2 groups randomly. Immediate loading (IL) group which received implant into the site of missing tooth and immediately loaded by placed provisional crown while the delayed loading (DL) group received implant and placed the crown after 3 months. Implant surgery included bilateral missing posterior teeth, and implant placement done by the aid of computer guided surgical stent. Cone beam CT was taken before implant placement, 6 and 12 months after surgery. The distance between the alveolar crest and the implant was measured at the mesial and distal aspects of each implant. Bone changes were calculated for the first year as a primary outcome. As a second concern, the implant stability quotient (ISQ) was measured at implant insertion and after three, six, nine and twelve months. Finally, the peri-implant probing pocket depth was measured at the same timing. Results: The marginal bone loss (MBL) showed a statistical significant difference between the studied groups in mesial side at 6 and 12 month. While there was no significant difference between the studied groups in distal side at 6 and 12 months. By comparing the two groups regarding the mean implant stability quotient (ISQ), there was no statistically significant difference between them at any follow-up period. The peri-implant probing depth (PPD) evaluation between immediate and delayed loading groups the mean values revealed a statistically significant at all follow up periods. Conclusions: Implant survival rate for one year in patients suffering from chronic periodontitis is not affected by time of dental implant loading (immediate loading or delayed loading) according to clinical and radiograph assessment.