“…However, it is known that major growth factors and growth factor families from PRP, such as tissue growth factor-β (TGF-β), insulin-like growth factor 1 (IGF- 1), bone morphogenetic proteins (BMP), platelet-derived growth factor (PDGF), vascular endothelial growth factor (VEGF), epidermal growth factor (EGF), fibroblast growth factor (FGF), and hepatocyte growth factor (HGF), take part in the process of OA healing [ 42 , 43 , 44 ]. The detailed composition of blood products results not only from the properties of the patient’s blood but also from the method of preparation; hence, apart from PRP used for injection into TMJs cavities, there are also other substances including I-PRF (injectable platelet-rich fibrin) and PRGF (plasma-rich in growth factors) [ 45 , 46 , 47 ]. Various growth factors play a role in the proliferation and differentiation of chondrocytes, chondrocyte mitosis and extracellular matrix synthesis, and vascular structure formation and regeneration, which are the basis for cartilage regeneration [ 43 ].…”