Oral Bacteria Flashcards
What are some bacteria and their tolerance to oxygen
S.cocci -facultative and obligate anaerobes
Staphylococci - facultative anaerobes
Actinomycetes - facultative anaerobes and obligate
Lactobacillus - facultative anaerobes
Eu bacterium - obligate anaerobes
What are the s. Cocci species found in the oral micro flora and where are they fond specifically
Mutans - tooth surface fissures
Oralis - tooth in plaque
Sanguinis -oath in plaque
What is s. Mutans
Lead to tooth decay
Work with wide range of antibiotics
Adapted for resource acquisition and defence
What is dental caries
Local dissolution of the enamel which may advance to the dentine or pulp
Common in pits/fissures
Accumulation of plaque
What initiates dental caries
S mutans
How does s mutans initiate dental caries
Bind and colonise to tooth surface and produce extra cellular polysaccharide
Produce acid at a high rate from sugar (acidogenic)
Tolerate high concentrations of acid (aciduric)
What does s. Sanguinis do
This is a sub member of oralis group
Large numbers
Bacterial endocarditis
Bond to tooth surface
What bacteria is involved in infective endocarditis form the oral micro flora
S anguinis particularly
S mitis
S oralis
How does s. Sanguinis cause infective endocarditis
Enter blood after oral trauma
Bacteria settle on valves
Causing infective endocarditis
What are lactobacilli
After streptococci , these are most important groups of bacteria causing dental caries
Are lactobacilli gram +ve or -ve
+ve
What is the shape of lactobacilli and a few of its properties
Pleomorphic (variable shape) rods
Acidogenic and aciduric - can survive and reproduce in acidic conditions
What does the level of lactobacilli in the salvia correlate with
Carbohydrate intake
Where is a low pH in the mouth
Deep Carious lesions
What are actinomycetes
Gram +ve pleomorphic rods
Which can be arranged single, pairs of clumps
What can actinomyces have which can aid them in adherence
Fimbriae
Where is actinomyces usually found in the oral environment
In mouth, dental plaque, tonsil crypts
Supra/sub gingival plaque
What are a couple of species in the mouth of actinomyces
A viscosus
A naesluddi
What kind of caries are actinomyces associted with
Root surface caries
What is the gingival crevice
Groove between tooth and gum where accumulation of plaque occurs (if severe = gingivitis)
What is the periodontal pocket
In periodontal disease the whole support tissue around the tooth becomes inflamed when dental plaque growths betweent he tooth and the gum
What kind of bacteria does a healthy healthy gingiva crevice contain
Gram +ve cocci
What are the conditions like below the gingival margin
Anaerobic
Underneath the gingival margin where do nutrients come form instead of saliva and food
Gingival crevicular fluid
What are the majority of bacteria found in the perio pocket
Gram negative anaerobic bacilli
What other bacteria is found at the base of the perio pocket
Spirochetes
What is the red complex
Group of bacteria associated with dieseased pockets
2 GNAB’s (tannerella forsythia and porphyromonas gingival is)
And one spirochete
Are oral bacteria gram -ve or +ve
Gra +ve
