Microflora of Dental Plaque Flashcards Preview

BDS 2: Adult Restorative > Microflora of Dental Plaque > Flashcards

Flashcards in Microflora of Dental Plaque Deck (28)
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1

Describe the features of teeth that make it beneficial for microbial colonisation (2)

- Hard
- Non-shedding

2

Why are pits and fissures of teeth good for microbial communities?

Offer protection from wider environment

3

What are gingival crevice bathed in?

Gingival crevicular fluid

4

How may bacteria on the tongue contribute to periodontal disease?

Back of the tongue can act as a reservoir for some gram negative anaerobes which may be present in periodontal diseases

5

What structures of the tongue may act as habitats for micro organisms?

Papillary surfaces of the dorsum of the tongue

6

What product found in saliva can influence aggregation and adhesion of bacteria to oral surfaces?

Glycoproteins in the saliva

7

How can some microbial communities be physically removed?

By saliva and GCF and then swallowed

8

How can saliva help remove microbial communities? (3)

- Physical removal
- Production of lysozyme which hydrolyse peptidoglycan in bacterial cell wall
- Production of lactoferrin which competes with bacteria for iron

9

What is the most prevalent bacteria in the adult oral cavity

Streptococci

10

What is the primary pathogen in aetiology of enamel caries in children and young adults?

Mutans Streptococcus

11

What is the relevance of the Streptococcus oralis group?

Opportunistic pathogens isolated frequently from infective endocarditis

Have to be aware when extracting tooth as bacteria could enter blood

12

What is the relevance of the Streptococcus milleri group?

Opportunistic pathogens important cause of purulent disease

13

What is the relevance of the Enterococcus?

Recovered in low numbers from several oral sites involved in root canal infections

14

What forms a major portion of plaque microflora (esp at approximate sites)?

Actinomyces

15

What is the relevance of the Eubacterium?

Anaerobic bacteria tat are involved with
Periodontitis;
Necrotic dental pulp;
Infections of the head, neck and lung

16

Name some microbes that are considered Gram-Positive Rods & Filaments (4)

- Actinomyces
- Eubacterium
- Lactobacillus
- Propionibacterium

17

What is the relevance of the Lactobacillus?

Involved in advanced caries lesion of enamel and root surface

18

Name two microbes that are are considered Gram Negative cocci

- Neisseria
- Veillonella

19

What is the relevance of the Neisseria?

Aerobic microbe that are among first colonisers of a clean tooth surface

20

What is the relevance of the Veillonella?

Anaerobic microbe that play an important role I dental plaque and caries

21

Where is Haemophilus spp commonly found?

Common in saliva, on
epithelial surfaces, and in dental plaque

22

Where is Capnocytophag spp commonly found?

Found in sub-gingival plaque

23

Where is actinomycetemcomitans (AA) commonly found?

Found in aggressive periodontitis

24

Where is Simonsiella commonly found?

Epethelial surfaces

25

Where is Porphyromonas gingivalis commonly found?

Found at subgingival sites

26

Where is Prevotella commonly found?

Isolated from dental plaque especially sub-gingival sites

27

Where is Fusobacterium commonly found?

Gingival crevice and periodontal pockets

28

What makes up the largest portion of the oral fungal flora?

C.albicans