For the PRF protocol, blood was collected from three healthy volunteers who gave their informed consent to this study in accordance with the ethical standards of the National Research Committee (Ärztekammer Rheinland-Pfalz, no. “2019-14705_1”) and the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ten milliliters of peripheral venous blood per sample were collected after puncturing the cephalic or the median cubital vein with the vacutainer system and specific sterile plain vacuum tubes with additional silicone within their coating surface for solid (A-PRF+, Mectron, Carasco, Italy) and liquid PRF, respectively (iPRF, Mectron, Carasco, Italy). Next, PRF was directly manufactured (1,200 rpm for 8 min, relative centrifugal force 177 g at a fixed angle rotor with a radius of 110 mm, Duo centrifuge, Mectron, Carasco, Italy), as previously described (Blatt et al., 2020).
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