الفهرس 
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Abstract
Aim: This study aims at evaluating the efficacy of PRF, as a membrane, on the amount of bone fill in dehiscence defects, in comparison to collagen membrane.Materials and methods: 20 patients were selected and randomly assigned to either the PRF group (test) or collagen membrane group (control). The dehiscence defects were covered by xenograft, afterwards, the selected membrane was applied.
Results: At the re-entry surgery all implants were clinically osseointegrated. The control group showed ≥ 60 % defect fill in 77.8% of cases, while in the test group only ≥ 50% defect fill was achieved in 33% of group cases. CM group showed statistically significantly lower mean defect surface area than PRF group.
Conclusions: The use of PFR in GBR procedures may not be of great benefit. Further research work is recommended.