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Figure 3: Group II. (a) Radiographic aspect showing periradicular radiolucent area at the furca region. (b) Histological section of the furca region showing the presence of biofilm and bacteria in the inter-radicular tissue (Brown and Brenn; ×33 magnification). (c and d) Presence of biofilm in the root canal and periodontal ligament, including bacteria (in red) invading the dentinal tubules (Brown and Brenn and HE, respectively; ×66 and ×66 magnifi cations)

Figure 3: Group II. (a) Radiographic aspect showing periradicular radiolucent area at the furca region. (b) Histological section of the furca region showing the presence of biofilm and bacteria in the inter-radicular tissue (Brown and Brenn; ×33 magnification). (c and d) Presence of biofilm in the root canal and periodontal ligament, including bacteria (in red) invading the dentinal tubules (Brown and Brenn and HE, respectively; ×66 and ×66 magnifi cations)