Pathology Treatments

Periodontal disease index

Canine Example

Feline Example

Whilst a classification of periodontal disease may aid in potential treatment and planning, it is seldom the case that the entire dentition is at the same stage of disease. PDI was originally a useful index for human epidemiological studies, and used six teeth as a representation of the entire mouth. In pets, a percentage attachment loss due to the variation in patient size and thus the depths of pockets can be used as follows:

  • PD0 – no attachment loss: normal periodontium.
  • PD1 – no attachment loss: gingivitis.
  • PD2 – 25% attachment loss: early periodontal disease.
  • PD3 – 25 – 50% attachment loss: moderate periodontal disease.
  • PD4 – 50% attachment loss: severe periodontal disease.


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