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2. Oral Microbiology
Terms in this set (19)
What microbial species do you find in low pH conditions in the mouth?
What is the pelicile?
It is the formation of glycoproteins on the surface of teeth that forms after cleaning. It provides binding sites for bacterial colonisers.
Why don't bacteria colonise the epithelial cells within the mouth?
Because the epithelial cells constantly shed and reform so there is never a constant colonising site.
Why are teeth/oral prosthetic a good site for bacteria to bind to?
It is a hard, non shedding surface
What are the characteristics of dental caries?
- Demineralisation of enamel and dentine
Where are dental caries most prevalent?
In developing countries of Latin American, Middle Eastern and South Asian countries.
Why has the incidences of dental caries decreased in developed countries recently?
- Better oral hygiene measures
- Fluoride treatments
What is the most commonly associated bacterial species with dental caries?
How do dental caries occur?
Fermentation of carbohydrates into lactic acid by bacteria which leads to the dimineralisation of enamel which is higher than the rate of reminerilsation which occurs naturally in tooth
How does gingivitis occur?
Bacteria colonise and form biofilms in the gingival crevice
What are the symptoms of gingivitis?
- Swollen gums
- Receding gums
- Bleeding gums
- Bad breath (halitosis)
How does gingivitis affect the teeth?
By weakening the gums it weakens the support of the teeth and therefore can cause teeth loss
Name some risk factors of gingivitis and other periodontal diseases?
- Low dental hygiene
- Preexisting conditions
What species is associated with gingivitis?
How does oral malodour occur?
Proteolytic degradation of sulphur containing peptides.
Name some examples of sulphur containing compounds which cause oral malodour.
- Hydrogen Sulphide
- Methyl Mercaptan
- Dimethyl Sulphide
What types of microorganisms cause oral malodour?
Gram negative anaerobes
Name some examples of the microorganisms that cause oral malodour.
- Poryphromonas gingivalis
- Fusobacterium nucleatum
- Prevotella intermedia
What species causes oral thrush?
This set is often in folders with...
1. Commensal Flora
3. Healthcare Associated Infections (HCAIs)
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