RT Journal Article T1 Differences in platelet‐rich plasma composition influence bone healing A1 Al‐Hamed, Faez Saleh A1 Abu‐Nada, Lina A1 Rodan, Rania A1 Sarrigiannidis, Stylianos A1 Ramirez‐Garcialuna, José Luis A1 Moussa, Hanan A1 Elkashty, Osama A1 Gao, Qiman A1 Basiri, Tayebeh A1 Baca González, Laura A1 Torres García Denche, Jesús A1 Rancán, Lisa A1 Tran, Simon D. A1 Lordkipanidzé, Marie A1 Kaartinen, Mari A1 Badran, Zahi A1 Tamimi, Faleh AB Aim: Platelet-rich plasma (PRP) is an autologous blood-derived material that has been used to enhance bone regeneration. Clinical studies, however, reported inconsistent outcomes. This study aimed to assess the effect of changes in leucocyte and PRP(L-PRP) composition on bone defect healing.Materials and Methods: L-PRPs were prepared using different centrifugation methods and their regenerative potential was assessed in an in-vivo rat model. Bilateral critical-size tibial bone defects were created and filled with single-spin L-PRP, double-spin L-PRP, or filtered L-PRP. Empty defects and defects treated with collagen scaffolds served as controls. Rats were euthanized after 2 weeks, and their tibias were collected and analysed using micro-CT and histology.Results: Double-spin L-PRP contained higher concentrations of platelets than singlespin L-PRP and filtered L-PRP. Filtration of single-spin L-PRP resulted in lower concentrations of minerals and metabolites. In vivo, double-spin L-PRP improved bone healing by significantly reducing the size of bone defects (1.08 ± 0.2 mm3) compared to single-spin L-PRP (1.42 ± 0.27 mm3) or filtered L-PRP (1.38 ± 0.28 mm3). There were fewer mast cells, lymphocytes, and macrophages in defects treated with double-spin L-PRP than in those treated with single-spin or filtered L-PRP.Conclusion: The preparation method of L-PRP affects their composition and potential to regenerate bone. PB Wiley SN 0303-6979 SN 1600-051X YR 2021 FD 2021-09-27 LK https://hdl.handle.net/20.500.14352/93312 UL https://hdl.handle.net/20.500.14352/93312 LA eng NO Al-Hamed, F. S., Abu-Nada, L., Rodan, R., Sarrigiannidis, S., Ramirez-Garcialuna, J. L., Moussa, H., Elkashty, O., Gao, Q., Basiri, T., Baca, L., Torres, J., Rancan, L., Tran, S. D., Lordkipanidzé, M., Kaartinen, M., Badran, Z., Tamimi, F. Differences in platelet-rich plasma composition influence bone healing. Journal of Clinical Periodontology. 2021;48:1613-1626 DS Docta Complutense RD 28 sept 2024