Classification Bacteria Abbreviation
High-Risk Aggregatibacter actinomycetemcomitans Aa
Porphyromonas gingivalis Pg
Tannerella forsythia Tf
Treponema denticola Td
Moderate-Risk Eubacterium nodatum En
Fusobacterium nucleatum/periodonticum Fn
Prevotella intermedia Pi
Campylobacter rectus Cr
Peptosterptococcus micros Pm
Eikenella corrodens Ec
Low-Risk Capnocytophaga species Cs
Table 2: Classification of bacteria based on the risk of periodontal disease.