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Figure 2: Group I. (a and b) Histological sections of the coronal and radicular regions, respectively, showing the presence of biofilm and bacteria (in red, blue and purple) spread along the dentinal tubules (Brown and Brenn; ×33 and ×66 magnifi cations). (c) Abscess in the pulpal crown tissue and inflammatory reaction in the pulpal root tissue (HE, ×33), (d) hypermia and hydropic degeneration (HE, ×66)

Figure 2: Group I. (a and b) Histological sections of the coronal and radicular regions, respectively, showing the presence of biofilm and bacteria (in red, blue and purple) spread along the dentinal tubules (Brown and Brenn; ×33 and ×66 magnifi cations). (c) Abscess in the pulpal crown tissue and inflammatory reaction in the pulpal root tissue (HE, ×33), (d) hypermia and hydropic degeneration (HE, ×66)