الفهرس 
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Abstract
Background: Immediate implant placement into fresh extraction socket has proven to be a safe and successful procedure. When dental implant placed into fresh alveolus, gap will be formed between the implant periphery and surrounding bone. To ensure osseointegration of the entire implants, bone graft materials and membranes have been employed in conjunction with immediate implantation. Objectives: This study was designed to evaluate the efficacy of amniotic membrane versus collagen membrane in guided bone regeneration around immediately placed dental implants into fresh extraction sockets.Methods: Fourteen patients, 4 males and 8 female with a mean age of 28.86±4.33 years, underwent extraction of one maxillary premolar and immediate replacement with dental implant. All patients were equally divided into two groups. In the first group, amniotic membrane was used while in the second group, collagen membrane was used to cover immediate implant and biphasic calcium phosphate bone graft. All patients were evaluated clinically and radiographically at 3, 6 and 9 months postoperatively. All clinical and radiographic parameters were subjected to statistical analysis.Results: During 9 months interval, in both groups, no implant was lost and all implants showed favorable clinical and radiographic findings. Comparison of modified plaque index and modified sulcus bleeding index at different periods of follow up was not found statistically significant difference. Periotest evaluation showed that all implants were well osseointegrated and stable. Radiographic analysis revealed that there was not statistically significant difference between the two groups in vertical and horizontal bone loss.Conclusions: Amniotic membrane is as effective as collagen membrane in guided bone regeneration around immediately placed dental implant.