Dental PG Aspirants: May 20, 2011

(From Sturdevants art & science of operative dentistry 4^th edition)

1. Polarization of DC – limited segment of population experiences most of disease . 80% DC in 20% children from lower socioeconomic status

2. MC chronic childhood disease – DC

3. DC causing organisms – S mutans – 8 strains a to h, S cricetus, S rattus , S ferus, S sobrinus

4. Most imp factor in causing DC is – high frequency sucrose exposure

5. Plaque formation

a) Acquired pellicle forms within 2 hours of brushing (30 mins -1 hr)

b) 12-24 hrs- cocci

c) 1-3days –cocci +filamentous bacteria

d) 1wk – palisades of cocci + filamentous bacteria

e) 3 wks – “corncorb”

6. Colonizations

Dorsum of tongue	Micrococcus mucilaginous, S salivarius
Teeth	S mutan , S mitis
Non carious teeth	S sanguis
Buccal mucosa	S mitis

7. Caries producing organisms – anerobic, ph <5.5 & negative redox potential

8. Combination of food and shelter- ‘ecological niche’

9. Niche saturation leads to ‘colonization resistance’

10. “Bacteriocin” produced by S mutans leads to colonization resistance

Dental PG Aspirants