Leitkeime
| Erreger | Art | Lebensbedingungen | |
| Actinobacillus actinomycetemcomitans | gram - | fakultativ anaerob | |
| Pophyromonas gingivalis | gram - | anaerob | |
| Prevotella intermedia | gram - | anaerob | |
| Treponema denticola | gram - | anaerob | |
| Bacteroides forsathus | gram - | anaerob | |
| Campylobacter rectus | gram - | anaerob | |
| Fusobacterium nucleatum | gram - | anaerob | |
| Streptococcus intermedius | gram + | anaerob | |