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7 Cards in this Set
- Front
- Back
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What is a biofilm and how is it structured?
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Combinations of colonies of many bacterial species, polysaccharides and protein.
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What are the main stages of development of dental plaque?
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Pristine, polished enamel:
Pellicle 2:30hrs First wave: Gram+ cocci Day 1 Colony expansion Day 3 Second wave: Gram- Day 12 Stric Gram- |
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What are the characteristics of each stage?
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Pellicle: glycoprotein from saliva
2:30: First gram + attach to pellicle Day 1: Expansion, secretion of extracellular polymers Day 3: 2nd wave- gram-ves anaerobes due to deprevation of oxygen Day 12: Very thick, multilayered. strictly anaerobes Day 12+: inflammatory response |
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Why are bacteria in a biofilm a difficult therapautical target?
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more resistant to antibiotics
Slower rate of growth of bacterial species in biofims The exopolymer matrix can retard diffusion |
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What are the main differences in biofilm composition between
periodontal health and disease? |
Health:
Cocci, streptococci Rods Gram + Aerobic bacteria Disease: Gram – Anaerobic bacteria P. Gingivalis T. Denticola A. actinomycetemcomitans |
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What is the specific plaque theory and what the non-specific?
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Non specific plaque theory: Composition of plaque differs from patient to patient and from site to site
Infection due to increase in mass of bacterial plaque Specific plaque theory: infection with specific species is responsible for major pathology |
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Which are the major bacterial complexes identified by Socransky and what is their involvement in periodontal disease?
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T. forsythensis,
P. gingivalis, T. denticola pockets and bleeding on probing |
