Objectives: The aim of the study was to evaluate the effect of injectable platelet-rich fibrin (i-PRF) on gingival thickness and gingival recession in individuals with thin periodontal phenotypes.

Method and materials: In this prospective study, i-PRF was applied via a semisurgical method to augment 53 tooth regions with thin periodontal phenotypes. In order to ensure that sufficient blood clot formed on the side of the gingiva facing the bone and that i-PRF reached the area, a minimal incision was made with the help of a scalpel in the apical region of the relevant region, and the periosteum was elevated with a microsurgical instrument. To ensure sustained exposure to angiogenetic growth factors and enhance the histoconductive properties, i-PRF injection was applied to the relevant areas in four sessions at 10-day intervals.

Results: An increase in gingival thickness was achieved in 92.5% of the areas treated with i-PRF, and the desired gingival thickness (0.8 mm) was achieved in 44.9% of these areas. In addition, significant reductions in the amount of recession were observed in 83.3% of the 12 gingival recession areas (P = .005). Moreover, complete coverage was achieved in 60% of these regions.

Conclusion: With the new i-PRF semisurgical method, it was shown that gingival thickness can be increased in tooth regions with thin gingiva, and that areas of gingival recession can be covered. Further comprehensive studies are needed to fully understand the role of i-PRF in enhancing angiogenesis and the histoconductive properties of this fully autogenous blood concentrate.

Keywords: blood platelet; gingival recession; gingival thickness; periodontal phenotype; platelet-rich fibrin.