M7 - Caries Flashcards
What group are oral streptococci apart of?
Viridians group
What type of streptococci are found on the tooth surface?
strep mutans
Where are strep salivarius found?
Tongue
What type of anaerobe are step mutans?
falcultative
What makes strep mutans aciduric?
Tolerate high concentrations of acid
Extracellular polymeric substances are known as?
Glucans
What is the name of the enzyme that establishes glycosidic linkages?
Glucotransferase (GTF)
What substance promotes extracellular polymeric substances?
Sucrose
Mutans are water soluble/insoluble glucans?
Insoluble
Dextrans are water soluble/ insoluble glucans?
soluble
What is the name of the enzyme that transfers L-fructose sugar from GDP- fructose?
Fructosyltransferase (FTF)
What are the 3 key proteins involved in attachment of S.mutans?
- protein antigens
- GTF
- Glucan binding proteins
Are lactobacilli gram +ve or -ve?
Gram +ve
What type of anaerobe are lactobacilli?
Facultative
After strep, what is the most important group of bacteria involves in caries?
Lactobacilli
What is lactobacilli grouped by?
fermentation end products
Lactobacilli increase as streptococci?
decrease
What do actinomyces produce?
EPS
Are actinomyces gram +ve or -ve?
Gram +ve
What do actinomyces need for optimal growth?
C02
Are Viellonella gram +ve or -ve?
Gram -ve
What do Viellonella use as their energy source?
lactic acid
What strain of viellonella colonises the oral cavity?
Viellonella parvula
How does Viellonella possible make the community less cariogenic?
catabolises lactic acid to weaker acids, raising pH
What is the name of the protein that induces metabolic blocks?
Bacteriocin
Knowing how many microorganisms there are in a vicinity and regulating the expression of genes within the DNA of bacterium is called?
Quorum sensing
