Fig. 4.

SEM images of three different parts of L-PRF. A Fiber-like appearance and mature structure of fibrin networks as shown by the arrows with the least cellular components observed. B White arrows point white blood cells with a distinct spherical structure. C Red arrows point the platelets while the white arrows point the leukocyte aggregations that are enmeshed within the immature fibrin networks. D The area around the junction between the two parts shows irregular and indistinct mesh structure, arrows pointed on some erythrocytes in standard shape. SEM: scanning electron microscope; L-PRF: Leukocyte-Platelet Rich Fibrin