of dentine sensitivity - answer1. Innervation of dentine (nerve fibres
within tubules)
2. Odontoblast transducer mechanism (would require odontoblasts to be present entire tubule
length)
3. Hydrodynamic theory (fluids in tubules disturbed by stimulus, changes stimulate odontoblasts
which leads...
What proportions of bacteria would be found in a healthy gingival crevice? - answer✔✔40%
streptococci, 40% actinomyces, 20% anaerobes
What proportions of bacteria would be found in moderate gingivitis? - answer✔✔25%
streptococci, 25% actinomyces, 50% anaerobes
Calculus consists of what percentage of inorganic compounds? - answer✔✔70-80%
Calculus is composed of mostly 4 principle types of calcium phosphate crystals, which one is
present in the highest content? - answer✔✔Hydroxyapetite
The periodontal ligament in health is how wide? - answer✔✔0.2-0.4mm
Define dentine hypersensitivity - answer✔✔A short, sharp pain arising from exposed dentine in
response to a stimuli (thermal/evaporative/tactile/osmotic/chemical) which cannot be ascribed to
any other dental defect or disease
Structure of dentine-pulp complex (6) - answer✔✔- Dentine/pre dentine
- Microscopic layer
- Layer of odontoblasts
- Cell free zone of connective tissue
- Cell rich zone of fibroblasts, undifferentiated cells & WBCs
- Central zone of blood vessels & nociceptive nerves
At which end are dentinal tubules wider? - answer✔✔Pulpal end
Explain the 3 theories of dentine sensitivity - answer✔✔1. Innervation of dentine (nerve fibres
within tubules)
2. Odontoblast transducer mechanism (would require odontoblasts to be present entire tubule
length)
3. Hydrodynamic theory (fluids in tubules disturbed by stimulus, changes stimulate odontoblasts
which leads to nerve discharge)
Describe the pulpal sensory supply (3) - answer✔✔- Max & mand branch of trigeminal nerve
- Nerve endings predominantly nociceptive (pain)
- Contains A-delta fibres & C-fibres
What ingredients will be present if treatment option is nerve desensitising? (3) With example of
product - answer✔✔- Potassium nitrate
- Potassium chloride
- Potassium citrate
- E.g. Sensodyne original
What ingredients will be present if treatment option is tubule obturation? (4) With example of
products - answer✔✔- Sodium fluoride (TPs/MWs/Varnish)
- Potassium oxalate liquids
- Resin bonding agents (Seal&Protect)
- Restorations (GIC)
Which toothpaste components can help in occluding tubules? (4) With examples of products -
answer✔✔- Strontium Acetate
- Silica (Colgate sensitive)
- NovaMin (GSK Sensodyne repair)
- Arginine (Colgate Pro-Relief)
Intrinsic source of erosion - answer✔✔Gastric acid
Extrinsic sources of erosion - answer✔✔Diet
Industrial
Critical pH of enamel - answer✔✔5.5
Critical pH of dentine - answer✔✔6.5
Explain what BEWE stands for, how it is scored & what each score is equal to - answer✔✔-
Basic erosive wear examination
- Scored by sextant
- 0 = no erosive wear
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