Resumo (EN)
Objective– To evaluate the quality of platelet-rich plasma (PRP) and platelet-rich fibrin (PRF) obtained through some types of protocolsfor obtaining platelet and leukocyte counts in the materials. Methods– Blood samples were collected from volunteers with the approvalof the Research Ethics Committee (CEP). The samples were centrifuged at different speeds and times (1300 RPM for 5 minutes, 550RPM for 5 minutes and 550 RPM for 3 minutes). Platelet and leukocyte concentrations were evaluated on the Coulter LH 750 analyzer.The results were subjected to statistical analysis (Graph Pad Prism). Results– Platelet dosages were significantly higher (p <0.0001) inthe PRF protocol centrifuged at 1300 rpm compared to other materials, and leukocyte dosages were higher in PRF centrifuged at 550rpm (p <0.05). Conclusion– The results of this work suggest that the centrifugation speed, the use of anticoagulant and the centrifugationtime are some interferents that affect the quality of the material obtained impacting on the decrease of the number of cells present inthe material. The results also point out that PRF presents higher cellular concentrations, mainly near the leukocyte laye