12Jan 2019 EFFICACY OF PLATELET RICH FIBRIN IN COMBINATION WITH ENAMEL MATRIX DERIVATIVE ON PERIODONTAL TISSUES REGENERATION IN RATS. Noraddin R. Almaqtari , Islam Ateia , Menatalla M. Elhindawy , Fatma M. Ibrahim and Jilan M. Youssef. BDS, Faculty of Dentistry, Sana'a University, Yemen. Lecturer of Oral Medicine & Periodontology, Faculty of Dentistry, Mansoura University, Egypt. Lecturer of Oral Biology, Faculty of Dentistry, Mansoura University, Egypt. Professor of Oral Biology, Faculty of Dentistry, Mansoura University, Egypt. Professor of Oral Medicine, Periodontology, Diagnosis and Oral Radiology, Faculty of Dentistry, Mansoura University, Egypt.