
Periodontal Examination — Gingivitis and Plaque Grading
Plaque Index (PI #)
 PI 0 — No observable plaque.
 PI 1 — Scattered plaque covering less than onethird of the buccal tooth surface.
 PI 2 — Plaque covering between one and twothirds of the buccal tooth surface.
 PI 3 — Plaque covering greater than twothirds 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 mineralized 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 onethird of the buccal tooth surface.
 CI 2 — Calculus covering between one and twothirds of the buccal tooth surface with minimal subgingival deposition.
 CI 3 — Calculus covering greater than twothirds of the buccal tooth surface and extending subgingivally.
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, noninflamed margins.
 GI 1 — Marginal gingivitis with minimal inflammation and edema 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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