Periodontal Examination — Gingivitis and Plaque Grading

Plaque Index (PI #)

  • PI 0 — No observable plaque.
  • PI 1 — Scattered plaque covering less than one-third of the buccal tooth surface.
  • PI 2 — Plaque covering between one- and two-thirds of the buccal tooth surface.
  • PI 3 — Plaque covering greater than two-thirds of the buccal tooth surface.

Canine

PI 1

 

PI 2

 

PI 3


Feline

PI 1

 

PI 2

 

PI 3


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Calculus Index (CI #)

Calculus is mineralised material on the tooth surface. The calculus index refers to the amount of calculus on a tooth.

  • CI 0 — No observable calculus.
  • CI 1 — Scattered calculus covering less than one-third of the buccal tooth surface.
  • CI 2 — Calculus covering between one- and two-thirds of the buccal tooth surface with minimal subgingival deposition.
  • CI 3 — Calculus covering greater than two-thirds of the buccal tooth surface and extending sub-gingivally.

Canine

CI 1

 

CI 2

 

CI 3


Feline

CI 2

 

CI 3


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Gingival Index (GI #)

Gingivitis index is the number assigned to designate the degree of gingival inflammation.

  • GI 0 — Normal, healthy gingival with sharp, non-inflamed margins.
  • GI 1 — Marginal gingivitis with minimal inflammation and oedema at the free gingival. No bleeding on probing.
  • GI 2 — Moderate gingivitis with a wider band of inflammation and bleeding upon probing.
  • GI 3 — Advanced gingivitis with inflammation clinically reaching the mucogingival junction usually with ulceration. Periodontitis will usually be present.

Canine

GI 1

 

GI 2

 

GI 3


Feline

GI 1

 

GI 2

 

GI 3


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