الفهرس 
Clinical evaluationOnly 14 pages are availabe for public view
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Abstract
The study was performed on 10 patients , in which atrumatic extraction of the tooth was performed. Then installation of implant fixture in tooth socket. Preparation of platelet rich fibrin membrane by collection of blood sample from the patient just before the surgery ,its centrifugation,the result was the formation of fibrin clot containing platelets located in tube middle ,just beween RBCSlayer at tube bottom
and acellular plasma at the top.The clot was then removed from the tube by the use of surgical twisser and then placed between 2 napkins and gently squeezed to create PRF membrane. Osteon bone graft particles placed in the gap between alveolar bony socket walls and implant fixture then PRF membrane was placed over them for their confinement ,then the gingival flap was closed by interrupted suture.After 6 months allowed for osseointegration that was confirmed by radiological evaluation,the abutment was prepared and fixed to the fixture ,impression was taken for the preparation of the final prosthesis . The cases were evaluated radiographical by Standardized periapical radiographs for the implant were taken immediately after fixture installation after stage 1 surgery
at 3 ,6 months after implant loading ,then radiographs were digitally subtracted to evaluate bone gain around implant shoulder. The cases were evaluated clinically by Mobility test by the use of the handles of
2 mirrors ,one handle placed from the buccal aspect and the other placed from the palatal aspect , performed after 3,6 months after stage 2 surgery .By Gingival bleeding index in which clinical signs and symptoms of inflammation of periimplant tissues were evaluated using criteria of gingival bleeding index at 3,6 months after stage 2 surgery.And also by, Probing pocket depth measurement by using plastic probe to detect probing depth around the implant ,evaluated at 3,6 months after stage
2 surgery