Stages of Periodontal Disease Artwork used by permission from Pfizer Animal Health

No gingival inflammation or periodontitis clinically evident PD0 Normal Clinically normal No gingival inflammation or periodontitis clinically evident Periodontal Disease Classification, http://www.avdc.org/?q=node/29#periostages, Date accessed 08/29/2010

Gingivitis only without attachment loss PD1 Stage 1 Gingivitis Gingivitis only without attachment loss Height and architecture of the alveolar margin are normal Periodontal Disease Classification, http://www.avdc.org/?q=node/29#periostages, Date accessed 08/29/2010

PD2 Stage 2 Early Periodontitis Less than 25% of attachment loss or at most there is a stage 1 furcation involvement in multirooted teeth. Early radiologic signs of periodontitis Attachment loss measured either by probing of the clinical attachment level or the radiographic distance of the alveolar margin from the cemento-enamel junction relative to the length of the root. Periodontal Disease Classification, http://www.avdc.org/?q=node/29#periostages, Date accessed 08/29/2010

Stage 3 PD3 Moderate Periodontitis 25-50% of attachment loss measured either by periodontal probe or radiologic measurement. Stage 2 furcation involvement in multi-rooted teeth. Periodontal Disease Classification, http://www.avdc.org/?q=node/29#periostages, Date accessed 08/29/2010

PD4 Stage 4 Advanced Periodontitis More than 50% attachment loss measured by periodontal probe or radiologic measurement Stage 3 furcation involvement of multi-rooted teeth Periodontal Disease Classification, http://www.avdc.org/?q=node/29#periostages, Date accessed 08/29/2010