Perio Microbiology 3: Subgingival Infection Flashcards
In the Subgingival Plaque Colored Complex which color interacts with the epithelium of the pocket?
Red Complex
What are the members of the Red Complex
P. gingivalis
T. forsythia
T. denticola
What is the order of the color complexes in terms of subgingival plaque maturation?
1: Yellow and Purple
2: Green
3. Orange
4. Red
In Supragingival biofilm formation what type of bacteria is at the tooth surface?
Gram +
In Supragingival biofilm formation what type of bacteria is at the soft tissue?
Gram -
Where do the supragingival bacteria get their nutrients?
Sugar in the saliva
What is the initial host response from the bacterial accumulation?
Plaque induced inflammatory response
Increased migration of PMNs
How does the biofilm expand subgingivally?
The weakening of the attachment between the tooth and the junctional epithelium allows Gram+ to migrate initially.
A Gram - mass follows
What is the host response to the subgingival migration?
Inflammatory Response Increased PMNs Increased Plasma cells Increased crevicular fluid Host tissue breakdown Physical shift in gingival position
What is the morphological distribution of bacteria subgingivally?
Gram + at tooth surface
Gram - at soft tissue
What type of respiration do they bacteria use subgingivally?
Anaerobic
Where do the bacteria get their nutrients subgingivally?
Peptides and Amino Acids from:
Crevicular fluid
Host tissue breakdown
Interbacterial feeding
What can happen to the epithelium itself?
Ulceration, allowing for the microbes to infect the tissue
