M9 Gram +ve Oral Bacteria Flashcards
what are the major genera of Gm +ve oral Bac
Street.cocci Staph.cocci actinomyces lactobacillus eubacterium
what kind of bac is streptococci
facultative and obligate anaerobes
what kind f bac is staphylococci
facultative anaerobes
what kind of is actinomyces
facultative anaerobes and obligate anaerobes
what kind of bac is lactobacillus
facultative anaerobes
what kind of bac is eubacterium
obligate anaerobes
isolated from perio disease
what is bac CNS
coagulase negative staphylococci
what does oral staph pose a risk of
oral disease and cross conamination
how much of staphylococcus is MRSA
10%
what is the remainder of staphylococcus
90% methicillin sensitive
what are the second most important group of ba involved in dental aries
after streptococci
then lactobacilli
are lactobacilli gram +ve or -ve
+ve
what is the shape of lactobacilli
pleomorphic rods
what are lactobacilli like for colonisation
poor adhesion so late colonisers
what does the acidogenic and auric properties of lactobacilli mean
survive and reproduce under acid conditions
what are the 3 main groups of lactobacilli
homolactic fermenters
heterolactic fermenters
facultative heterolactic fermenters
what are homolactic fermenters
produce only lactic acid (>65%)
from sugar
what are heterolactic fermenters
equal amounts of lactic acid, acetic acid and CO2
what are facultative heterolactic fermenters
normally homolactic fermenters
switch to heterolactic feremntation
what are some sp of lactobacilli
casei Gp
acidophilus
fermentum
what s lactobacillus case Gp
homofermenter
- rhamnosus
- paracasei
(competes with mutant)
what is lactobacillus acidophilus
homofermenter
what is lactobacillus fermentum
heterofermenter
what caries is lactobacilli assc with
deep carious lesson
low pH
what does the level of lactobacilli in saliva correlate with
carb intake
the fall of what bac has an impact on lactobacilli
lactobacilli increase as mutant streptococci fall
does lactobacilli initiate demineralisation
no
imp in progression when low pH
what is a caries susceptibility test
determine cariogenic bac in saliva
(s mutans and lacobacilli)
used on high risk pt
lactobacillus tend to have another function
protective
probiotic
- rhamnosus - milk
- casei and hamnosus reduced s mutans
are actinocymes gram +ve or -ve
+ve
is actinomyces prominent in the mouth
major proportion of microflora
- approximal
- gingival crevice
how are actinomyces arranged
single
pairs
short chains
clumps
how does actinomyces grow
branched network or hyphae not spores
what kind of bac is actinomyces
anaerobic or facultative
what aids actinomyces adherence and aggregation
fimbriae
where in the mouth is actinocyes mostly found
dental plaque
tonsil crypts
what is the shape of acinomyces
pleomorphic
what are some sep of actinomyces in the mouth
naesludii
odontolyticus
what kind of caries usually assc with actinomyces
root surface caries
what does a naesludii produce
extracellular slime and fructans for sucrose
when are naesludii able to produce disease
when into to a gnotobiotic hamster (sterile)
what can naesludii cause
actinomycosis
where is a israelii found
mouth
dental plaque
female genital tract
what kind of bac is a israelii
strict anaerobe
what does a israelii most likely cause
opportunistic
acitnomycosis
what is actinomycosis characteristic pus
thick fluid form sinuses
yellow
granular
‘sulphur granules’
what does granules in pus show
pathognomic
indicator of disease
what are the sulphur granules
aggregations of actinomyces filaments
smell
grittiness
how much israelii present in actinomyces leisons
> 80%
what are some co infectors with israelii
haemophilia
propionibacterium
what site treatment of actinomycosis
remove original dental focus of infection
incision an drain lesion
long term antibiotic treatment
what si the antibiotic treatment used against actinomycosis
penicillin/amoxycillin - 6 weeks
erythromycin used if allergy
what are some chaacretrstics of the eubacterium species
diverse
obligate aearbes
bacilli - filamentous
gram vary
what does asaccharolyic mean
able to metabolic sugar for energy
what are other gram +ve oral bac
propionibacterium
rothia
corynebacterium
what are propionibacterium
gram +ve
non spore forming
anaerobes
what are the sb groups of propionibacterium
propionicus
acnes
what are the propionibacterium propionicus
prod proprionic acid
mouth, dental plaque and calculus
similar to acitnmyces israelii = actinomycosis
what is propionibacterium acnes
inhabit skin
acne lesions
soft tissue abscess
in peril pockets assc with period disease
what is rothia dentocariosa
progression caries pleomorphic rods long chains supraginigival plaque opportunistic --> endocarditis
what are the main types of corynebacteria
diphtheria
matruchotii
what is corynebacteria matruchotii
assc with dental plaque
initiate calculus children with active caries
where is actinomyces most dist
sp assc with higher populations in supra gingival plaque
where is propionibacterium most dist
sp similar assc in supra and sub gingival plaque
where is eubacterium usually assc
sub gingival plaque
-anaerobic
where are streptococci usually dist
genera assc with range of environments
