FFH, also known as irritation fibroma, is a focal reactive hyperplasia of fibroblasts with overproduction of collagen.
Therefore, the aim of this study was to evaluate the presence of stromal myofibroblasts in the main focal reactive overgrowths of the gingiva (FFH, PG, POF, and PGCG).
Differences in the presence of myofibroblasts among FFH, POF, PG, and PGCG were analyzed using the Kruskal-Wallis test.
No stromal myofibroblasts were observed in FFH (Figure 1A), POF (Figure 1B), PG (Figure 1C), or PGCG (Figure 1D).
FFH is characterized by the hyperplasia of fibroblasts with overproduction of collagen.