ABSTRACT
Objective@#To study the effects of platelet-rich fibrin extract (PRFe) and platelet-derived growth factor (PDGF) released from PRFe on the proliferation of human gingival fibroblasts (HGFs) and to provide an experimental basis for its application in promoting gingival soft tissue increment.@*Methods@#Platelet-rich fibrin (PRF) was transformed into PRFe by tissue culture. The three-dimensional structure of PRF was observed by electron microscopy, and the content of PDGF in PRF was quantitatively determined by ELISA. The ratios of PRFe examined were 2.5% PRFe, 5% PRFe, 7.5% PRFe, 10% PRFe, 12.5% PRFe and 15% PRFe. Gingival fibrosis was detected by the CCK-8 method. After determining the optimal concentration of PRFe, flow cytometry was used to detect the effect of PRFe on the proliferation cycle of human gingival fibroblasts, and the effect of PDGF on the proliferative activity of gingival fibroblasts was observed by neutralizing the release of PDGF.@*Results @# PRF is a three-dimensional reticular structure that contains a large number of growth factors. PDGF release peaked on the 7th day. The proliferative activity of HGFs cultured with different concentrations of PRFe was concentration-dependent, but the effect was optimal at 5% PRFe (P < 0.05). There were no significant differences in the effect of subsequent concentration increases on the proliferation of HGFs (P > 0.05). The flow cytometry results showed that 5% PRFe could significantly stimulate the S-phase division and proliferation of gingival fibroblasts, while the PDGF neutralization test showed that the proliferation of gingival fibroblasts was significantly inhibited by the neutralization of PDGF.@*Conclusion@#Overall 5% PRFe had the best effect on promoting gingival fibroblast proliferation in vitro. PDGF released from PRF plays an important role in promoting the proliferation of gingival fibroblasts.