RESUMEN
Context: Platelet concentrates have been extensively used in a variety of medical fields to promote soft‑ and hard‑tissue regeneration. The significance behind their use lies in the abundance of growth factors (GFs) in platelets α‑granules that promote wound healing. Other than releasing a pool of GFs upon activation, platelets also have many features that indicate their role in the anti‑infective host defense. Aim: The aim of this study is to evaluate the antimicrobial activities of platelet‑rich plasma (PRP) and platelet‑rich fibrin (PRF) against periodontal disease‑associated bacteria. Subjects and Methods: Blood samples were obtained from ten adult male patients. PRP and PRF were procured using centrifugation. The antimicrobial activity of PRP and PRF was evaluated by microbial culturing using bacterial strains of Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans. Results: P. gingivalis and A. actinomycetemcomitans were inhibited by PRP but not by PRF. Conclusions: PRP is a potentially useful substance in the fight against periodontal pathogens. This might represent a valuable property in adjunct to the enhancement of tissue regeneration.