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Reham Lotfy Aggour

leading speakers for dentistry conferences 2017 - Reham Lotfy Aggour

Title: In vitro evaluation of mechanical and structural properties of leukocyte-platelet-rich fibrin and platelet-rich fibrin matrix

Reham Lotfy Aggour

October 6 University, Egypt

Biography

A lecturer of Oral Medicine and Periodontology in the Faculty of Dentistry, October 6 University, Egypt and a member of the Egyptian Association of Esthetic Dentistry. The author has more than fifteen years' experience in the field of Oral Medicine and Periodontology in particular the regenerative and esthetic surgical periodontal therapy. The author published many international researches on the surgical and nonsurgical treatment of periodontal diseases by using a variety of methods including various types of grafts, membranes and local measures. The author is especially interested in the application of autologous platelet concentrates and autologous fibrin-based membranes in periodontal treatment. 

Abstract

Platelet concentrates are classified into four categories; platelet rich plasma (PRP); leukocyte and platelet rich plasma (L-PRP); platelet rich fibrin (PRF) and leukocyte- and platelet rich fibrin (L-PRF). Most studies on platelet concentrates focus on the platelet and growth factor concentrations and rarely analyze the fibrin structure and the mechanical properties of each product. Nevertheless, the fibrin architecture directly influences the biology of all fibrin-based biomaterials and mechanical characteristics of the membrane may affect the final results of guided tissue regeneration (GTR). Thus further investigation is necessary to look further into all features of these biomaterials. This will enable us to comprehend the clinical results obtained and subsequently extend the fields of their therapeutic application. We examined the composition, mechanical properties and structural characteristics of platelet-rich fibrin matrix (PRFM); a variation of PRP that is obtained using a high-speed centrifugation technique, whereby the fibrin matrix is formed by the activation of the clotting cascade by the addition of calcium chloride and a second centrifugation step. Moreover, we compared these characteristics to those of L-PRF. In brief, Sixty three cubic centimeters (cc) venous blood was obtained from 10 male volunteers. Twenty seven cc was used to prepare 3 specimens of L-PRF (group 1), twenty seven cc was used to get 3 specimens of PRFM (group 2) and nine cc for whole blood analysis. After centrifugation, blood analyses were performed on the residual plasma after collecting L-PRF and PRFM. The L-PRF and PRFM membranes were processed for examination by light microscopy and transmission electron microscopy (TEM) and their mechanical properties were measured by a universal testing machine. 
Tensile strength and maximum tensile strain of L-PRF group was discovered to be significantly higher than PRFM group (p < 0.01). PRFM group was significantly stiffer than L-PRF group (p < 0.01). Histological examination revealed that PRFM is formed of a more organized and continuous network of thicker fibrin fibrils than L-PRF. Moreover, platelets were found in groups in the margins of this network. TEM demonstrated that PRFM membrane had many nonactivated platelets versus activated platelets in the L-PRF. We concluded that the structural and mechanical properties of PRFM may fit characteristics desirable for GTR procedures more than that of L-PRF.