Fish Zones in Endodontic | Endodontic Lecture | Dental Notes

Fish Zones in Endodontic | Endodontic Lecture | Dental Notes

Fish Zones in Endodontic | Endodontic Lecture | Dental Notes

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INTRODUCTION


Fish described the zones of periapical lesion. He described the reaction of peri-radicular tissue to Bacterial and noxious products and antigenic agents from the root canal. 

Fish in 1939 concluded that  zones of infection are not an infection by themselves but the reaction of the body to infection. {alertInfo}
 

FOUR FISH ZONES IN ENDODONTICS


The Four Fish Zones of Infection in Endodontics are- {alertSuccess}

1. Zone of Infection (Polymorphonuclear Cells PMNs)

  • Characterized by Polymorphonuclear Leucocytes.
  • Present in the center of the Lesion
  • Micro-organism present only in this area.

2. Zone of Contamination (Round Cell Infiltration)

  • Characterized by Round Cell Infiltration
  • Cellular Destruction around the Central Zone.
  • This Destruction not from bacteria but due to Bacterial Toxins discharge from Central Zone.
  • Bone cells died and Empty Lacunae.
  • Leukocytes prevalent.

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3. Zone of Irritation (Macrophages and Osteoclasts)

  • Found away from the Central lesion because toxins get more diluted.
  • Degradation of Collagen Fibers by Phagocytes.
  • Histologic picture simulates body attempt to repair.

4. Zone of Stimulation (Fibroblasts and Osteoblasts)

  • Found at Periphery because toxins are mild enough to act as stimulus.
  • Fibroblasts and Osteoblasts secret collagen fibers.

FISH ZONES IN ENDODONTICS FLASHCARD


Fish Zones in Endodontic | Endodontic Lecture | Dental Notes


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