M9 Gram +ve Oral Bacteria Flashcards Preview

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Flashcards in M9 Gram +ve Oral Bacteria Deck (66):
1

what are the major genera of Gm +ve oral Bac

Street.cocci
Staph.cocci
actinomyces
lactobacillus
eubacterium

2

what kind of bac is streptococci

facultative and obligate anaerobes

3

what kind f bac is staphylococci

facultative anaerobes

4

what kind of is actinomyces

facultative anaerobes and obligate anaerobes

5

what kind of bac is lactobacillus

facultative anaerobes

6

what kind of bac is eubacterium

obligate anaerobes
isolated from perio disease

7

what is bac CNS

coagulase negative staphylococci

8

what does oral staph pose a risk of

oral disease and cross conamination

9

how much of staphylococcus is MRSA

10%

10

what is the remainder of staphylococcus

90% methicillin sensitive

11

what are the second most important group of ba involved in dental aries

after streptococci
then lactobacilli

12

are lactobacilli gram +ve or -ve

+ve

13

what is the shape of lactobacilli

pleomorphic rods

14

what are lactobacilli like for colonisation

poor adhesion so late colonisers

15

what does the acidogenic and auric properties of lactobacilli mean

survive and reproduce under acid conditions

16

what are the 3 main groups of lactobacilli

homolactic fermenters
heterolactic fermenters
facultative heterolactic fermenters

17

what are homolactic fermenters

produce only lactic acid (>65%)
from sugar

18

what are heterolactic fermenters

equal amounts of lactic acid, acetic acid and CO2

19

what are facultative heterolactic fermenters

normally homolactic fermenters
switch to heterolactic feremntation

20

what are some sp of lactobacilli

casei Gp
acidophilus
fermentum

21

what s lactobacillus case Gp

homofermenter
- rhamnosus
- paracasei
(competes with mutant)

22

what is lactobacillus acidophilus

homofermenter

23

what is lactobacillus fermentum

heterofermenter

24

what caries is lactobacilli assc with

deep carious lesson
low pH

25

what does the level of lactobacilli in saliva correlate with

carb intake

26

the fall of what bac has an impact on lactobacilli

lactobacilli increase as mutant streptococci fall

27

does lactobacilli initiate demineralisation

no
imp in progression when low pH

28

what is a caries susceptibility test

determine cariogenic bac in saliva
(s mutans and lacobacilli)
used on high risk pt

29

lactobacillus tend to have another function

protective
probiotic
- rhamnosus - milk
- casei and hamnosus reduced s mutans

30

are actinocymes gram +ve or -ve

+ve

31

is actinomyces prominent in the mouth

major proportion of microflora
- approximal
- gingival crevice

32

how are actinomyces arranged

single
pairs
short chains
clumps

33

how does actinomyces grow

branched network or hyphae not spores

34

what kind of bac is actinomyces

anaerobic or facultative

35

what aids actinomyces adherence and aggregation

fimbriae

36

where in the mouth is actinocyes mostly found

dental plaque
tonsil crypts

37

what is the shape of acinomyces

pleomorphic

38

what are some sep of actinomyces in the mouth

naesludii
odontolyticus

39

what kind of caries usually assc with actinomyces

root surface caries

40

what does a naesludii produce

extracellular slime and fructans for sucrose

41

when are naesludii able to produce disease

when into to a gnotobiotic hamster (sterile)

42

what can naesludii cause

actinomycosis

43

where is a israelii found

mouth
dental plaque
female genital tract

44

what kind of bac is a israelii

strict anaerobe

45

what does a israelii most likely cause

opportunistic
acitnomycosis

46

what is actinomycosis characteristic pus

thick fluid form sinuses
yellow
granular
'sulphur granules'

47

what does granules in pus show

pathognomic
indicator of disease

48

what are the sulphur granules

aggregations of actinomyces filaments
smell
grittiness

49

how much israelii present in actinomyces leisons

>80%

50

what are some co infectors with israelii

haemophilia
propionibacterium

51

what site treatment of actinomycosis

remove original dental focus of infection
incision an drain lesion
long term antibiotic treatment

52

what si the antibiotic treatment used against actinomycosis

penicillin/amoxycillin - 6 weeks
erythromycin used if allergy

53

what are some chaacretrstics of the eubacterium species

diverse
obligate aearbes
bacilli - filamentous
gram vary

54

what does asaccharolyic mean

able to metabolic sugar for energy

55

what are other gram +ve oral bac

propionibacterium
rothia
corynebacterium

56

what are propionibacterium

gram +ve
non spore forming
anaerobes

57

what are the sb groups of propionibacterium

propionicus
acnes

58

what are the propionibacterium propionicus

prod proprionic acid
mouth, dental plaque and calculus
similar to acitnmyces israelii = actinomycosis

59

what is propionibacterium acnes

inhabit skin
acne lesions
soft tissue abscess
in peril pockets assc with period disease

60

what is rothia dentocariosa

progression caries
pleomorphic rods
long chains
supraginigival plaque
opportunistic --> endocarditis

61

what are the main types of corynebacteria

diphtheria
matruchotii

62

what is corynebacteria matruchotii

assc with dental plaque
initiate calculus children with active caries

63

where is actinomyces most dist

sp assc with higher populations in supra gingival plaque

64

where is propionibacterium most dist

sp similar assc in supra and sub gingival plaque

65

where is eubacterium usually assc

sub gingival plaque
-anaerobic

66

where are streptococci usually dist

genera assc with range of environments