CAP 8

Question 1

Describe bacterial colonisation

Answer 1

0-4 hours

Strep mitis, mutans, oralis, sanguis, Actinomyces spp, Gram -ve bacteria

Question 2

When does microcolony formation take place?

Answer 2

4-24 hours

Question 3

When does the initation of caries lesions occur?

Answer 3

1-14 days

Question 4

What happens to the extracellular and intracellular polysaccharides when contact with plaque matrix?

Answer 4

They turn to acid

Question 5

What is the ecological plaque hypothesis?

Answer 5

Plaque can accumulate on all tooth surfaces
Microflora can change due to sugar etc
Removal of plaque and sugar= reversible

Question 6

Describe the outer layer of dentine caries? (DDII)

Answer 6

Demineralised, denatured, infected, irriversible

Question 7

Describe the inner layer of dentine caries (DMIR)

Answer 7

Demineralised, minimally infected, revrsible

Question 8

What is ultra conservative caries?

Answer 8

Covering a cavity with composite to kill off the bacteria

Question 9

What are the steps of Stepwise excavation? (4)

Answer 9

1. Remove superficial layer of infective necrotic dentine
2. Place Ca OH lining and GI
3. Leave for 6-12 months
4. Re clean cavity and restore