Dentine Hypersensitivity Flashcards
Describe the Pain.
short, sharp pain
How is Dentine Exposed?
loss of enamel by removal, attrition, abrasion or erosion
How does Erosion Occur?
intrinsic or extrinsic acids.
instrinic - what comes from within e.g. GIT acid
extrinic - like orange juice
What is Erosion?
tooth surface loss
What Determines the Rate of Erosion? (4)
pH, temperature, duration, frequency
How can Toothpaste Lead to Dentine Hypersensitivity?
abrasive particles
- remove smear layer
- open dentinal tubules
or
- may occlude tubules with particulate matter
Epidemiology of Dentine Hypersensitivity.
populations, habits, diets, gender
Most Affected Teeth in order
first premolar
canine
incisor
second premolar
molars
Does Dentine Hypersensitivity Correspond to Gingival Recession?
Yes
Aetiology of Dentine Hypersensitivity.
exposure + stimulus
What are the possible stimuli?
thermal
osmotic
dessication
electrical
tactile - physical contact
Does the Pulp have to be Vital?
Yes.
What are the 3 Proposed Mechanisms of Sensitivity Conduction?
- unlikely odontoblasts are receptors
- nerves in dentine - but only 1% of tubules have nerves
- hydrodynamic mechanism
What is the Hydrodynamic Mechanism? (4)
- there is movement of dentinal tubule content
- increased outward fluid flow
= change in pressure - distortion of a-delta fibres causes pain
fluid flow may also result in electrical discharge
Why is the Width of Dentinal Tubules Important?
rate of flow = radius4