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Flashcards in mini assessment 5-10 Deck (84)
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1

1-Leewenhoek

2-W.D. Miller

3-Clark

4-Fitzgerald

5-Loesche

6-Marsh

1-microscopic

2-chemo-parasitic theory

3-S. Mutans

4-S. Mutans from lesions

5-plaque theory

6-ecological plaque

2

Non Specific Plaque Hypothesis

Dental Plaque= dental disease but the decay= non specific because of overgrowth of acidogenic bacteria Prevent it by removing plaque

3

Oral Microbiology---Miller

1- plaque

2- susceptible host

3- fermentable carbohydrate

4-acid production

5- cavity (demineralization)

4

Caries are Initiated By

Time, Host (teeth), Biofilm (bacteria), Nutrients

5

Specific Plaque Hypothesis

-ONLY dental plaque colonized by SPECIFIC bacterial species

Within Caries= S. Mutans & Lactobacillus Caries are SUCROSE DEPENDENT

6

S. Mutans

-most common in caries

-reproduce + survive best in low pH

-diff survival rates

7

S. Sanguis

-Fimbriae attach to pellicle

-Both S. mutans & S. sanguis

-increase risk for caries

-difficult to get rid of

8

Lactobacilli

-not original colonizers, only secondary

-acid via fermentation

-come before teeth eruption

-on the dorsum of the tongue

-not needed for lesion development

-comes with S. Mutans & S. sabrinus

-demineralization once lesions begins

9

1- acidogenic

2-aciduric

3-glucansformation

4-extracellularpolysaccharides

5-intracellularpollysaccharides

1- transports sugars and converts them to acid

2- they thrive at low pH

3-GTF

4-adheres to tooth

5- provides energy when sugars aren't available

10

Nutrient Sources

Sugars---so polysaccharides stick Sucrose---generate acid: pH decreases=demineralization of tooth and an increase in s.mutans= biofilm

11

Demineralization

Occurs below at 5.5---stephens curve

12

Cariogenicity

S. Mutans & sucrose combine to make glucans that will help with adhesion to tooth, and increase the energy source for bacteria (more acid)

13

Dental Plaque Formation

1- pellicle formation- acellular protein film from saliva

2-0-4 hours- single bacteria colonizes (sanguis. mitis. actinomyces)

3-4-24- microcolonies

4-1-14- microbial succession towards actinomyces

5- 2 weeks and plaque is mature

14

Biofilm

microorganisms attached to surface in matrix of extracellular polymers of host/bacteria (plaque) -resistant to antibiotics while individually it isnt

15

Biofilm Cycle

1-cell attaches and adheres

2- grows

3-Detaches and spreads

16

Biofilm Characteristics

-Complex structure

-responsive to environment

-Detaches and sprads

-Quorum Sensing

-Resistant to antibiotics

17

Lactobacillus

S. Mutans

S. Sanguis

Actinomyces

Lactobacillus

acid via fermentation

caries

not needed for lesions

root caries

secondary colonizers

18

Restorative Model of Care

Exam cavity

remove

operate

replace with filling

recall

19

1- healthy enamel

2- initial, no cavity lesion

3- cavitation

4- root caries below filling

5- recurrent cavitation

6- loss of crown

20

Chewing Gum

Xylitol & Sorbitol 

xyliotol- plaque reducing effect, attracts and then starves bacteria so it helps remineralize

21

Fluoride

inhibits enolase of S. Mutans

pentrates white spot lesions

---fluoride resistant S. Mutans are less cariogenic than fluoride sensitive

22

Chlorhexidine

Surface acting, S.mutans decrease by 50%

23

Transmission of Oral Flora

Vertically---mother to child

Horizontally---from environment (h20)

24

Window of Infectivity of S. Mutans

19-31 Mo. (26 mo mainly)

 

25

Proximal Caries

adjacent tooth surface---75% chance will spread to other tooth

26

Where do carious lesions occur

Time: at plaque retentive sites (build up over time)

27

Susceptibility to Dental Caries

1) mandibular 1st molars

2) Max First Molars/ max and mand 2nd molars

3) 2nd premolars, max incisors, 1st premolars

4) mandibular incisors, canines

28

Enamel Caries

aka. Smooth surface caries

Beneath plaque as areas of decalcification (white spots)

- less inter rod and mucopolysaccharides

-triangular pattern: APEX towards DEJ and BASE towards tooth SURFACE

29

Surface Zone

Body

Dark Zone

Transulcent Zone

30

White Spot Lesion

Dissolves tooth structure= loss of minerals= porosites= white spot lesion

internal loss of minerals but the external is still intact just porous