Fig. 4

Histological sections stained with Massons’s trichrome stain for platelet-poor and platelet-rich plasma after 1 (T1), 3 (T3), and 6 months (T6) healing time. The myelinated nerve fibers diameter (see arrows) increased with longer healing times for PPP (d–f) and PRP (j–l), but no effect was seen on nerve density (a–c and g–i). All sections were acquired with a light microscope at × 20 or × 40 magnification