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Figure 1. Hematoxylin-eosin staining of a healthy pulp tissue (A), hyperemic (B), and irreversible pulpitis (C) (oil immersion, magnification 100X). The diameters of the randomly selected arterioles were recorded only when they were perpendicular to the plane of section. The diameters of the arterioles showed a statistically significant increase in parallel with the development of an inflammatory pathological process. Data are presented as means ± SD of 5 pulps in each pulp condition, with 20 measurements in each group. The vascular diameter (A = 22 µm, B = 32 µm, C = 48 µm) differences were significant in all 3 groups (*p < 0.05 A vs. B, *p < 0.05 B vs. C, *p < 0.05 A vs. C).
