الفهرس 
Title: The effect of platelet rich fibrin (PRF) versus xenograft in closed sinus lift with implant placement on implant stability in maxillary posterior area Randomized clinical trial
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Abstract
The most common problem after extraction of upper posterior teeth are maxillary sinus Pneumatization with resorption of its underling alveolar ridge and decrease in bone quality in upper posterior region.The present study was conducted to evaluate the primary stability of implant in closed sinus lifting cases using PRF as a grafting material in comparison to xenograft using Ostell based on the concept of resonance frequency analysis in assessing primary stability.he sample of this study consisted of sixteen maxillary partially edentulous patients who were examined clinically and radiographically.The patients were chosen from the outpatient Dental Implant Clinic, Faculty of Dentistry, Cairo University based on the inclusion-exclusion criteria previously mentioned.Patients were divided in to two equal groups group A: closed sinus lifting by Osteotome using PRF as grafting material with implant placement in 8 partially edentulous patients group B: Closed sinus lifting by osteotome using xenograft as a grafting material with implant placement in 8 partially edentulous patients.After implant placement, Smart peg was placed on implant and Ostell is used to record ISQ. Implant stability was measured intraoperative and at week 2, 4, 6, 8 and 10 for both groups.The collected results were tabulated and statistically analyzed. The study results showed that there was no statistically significant difference between (PRF) and (Xenograft) groups in ISQ reading