Infection and Microbiology

Question 1

Periodontitis microbial complex theory
Socransky

Answer 1

• Green complex - Early coloniser species
  Attaches onto tooth surface and forms a pellicle
  
  • Capnocytophaga species
  • C. gingivalis
  • C. ochracea
  • C. sputigena
    ​
• Orange complex - Bridging species
  Responsible for progressive attachment loss and increase in pocket depth
  Creates a living condition suitable for strict anaerobes
  
  • Prevotella intermedia
  • Prevotella micra
  • F. nucleatum
    ​
• Red complex - Aggressive destructive species
  
  • Prevotella gingivalis
  • Treponema denticola
  • Treponema forsythia

Question 2

Strep milleri

Answer 2

• Strep milleri // Strep angiosus group
  Consists of three distinct Strep species
  
  • S. anginosus
  • S. intermedius
  • S. constellatus
    ​
• Abscess
  
  • S. milleri group are known for their pathogenicity and tendency to cause abscesses
    
    • Polysaccharide capsule
    • Pyrogenic exotoxin
    • Hydrolytic enzymes
  • Interaction with Neutrophils
    
    • Poor stimulators of chemotaxis
    • Some subspecies are capable of survivin phagocytosis