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Plaque Related Disease > Dentine Hypersensititvy > Flashcards

Dentine Hypersensititvy Flashcards

1
Q

Describe the composition of dentine

A

70% inorganic hydroxyapatite
20% organic collagen
10% water

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2
Q

What does dentine contain?

A

Collagen
Mucopolysacharide ground substance
Odontoblast process

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3
Q

Where do the odontoblasts lie?

A

At the periphery of the pulp

Processes extend from cell body to ADJ

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4
Q

What do dentinal tubules allow for?

A

Passage of fluid, chemical agents and bacteria

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5
Q

What is secondary dentine?

A

Dentine produced after the tooth is fully formed
Slowly formed through out life
Preferably on floor and roof of pulp chamber

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6
Q

What is tertiary dentine?

A

Produced when dentine is in contact with a noxious substance
Odontoblasts lay down more dentine to protect pulp from insult

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7
Q

Why is dentine hypersensitivity an increasing problem?

A

Due to true recession and exposure of root surfaces

And shrinkage post periodontal treatment

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8
Q

What has exposed sensitive dentine got?

A

8x the amount of dentine tubules

Tubule 2x normal diameter

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9
Q

What are the three main theories of dentine hypersensitivity?

A

Dentinal receptor theory- odontoblasts have sensory function
Hydrodynamic mechanism- bran strums theory
Modulation of nerve I pules by polypeptides

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10
Q

Describe bran storms theory

A

Dentinal tubules contain fluid
Stimuli causes rapid fluid movement within tubules
Deformation of odontoblasts processes adjacent to nerve fibres

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11
Q

What is pain produced in response to?

A

Thermal change
Mechanical probing
Hypertonic solutions
Dehydration

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12
Q

What treatment can be used for dentine hypersensitivity

A

Occlude tubules topically
Potassium ions
Potassium oxylate

Insulation restorations

RCT- de vitalise tooth

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13
Q

What prevention can be used against dentine hypersensitivity?

A

Reduce dietary acids
Advise against brushing immediately after eating
Tooth brush instruction

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14
Q

What are common de sensitising agents

A 
Sodium fluoride
Stannous fluoride
Sodium monofluorophosphate
Calcium hydroxide
Strontium chloride
Formaldehyde
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15
Q

How does sodium fluoride work against sensitivity?

A

Duraphat 5%
Fluoride from sodium salt taken into dentine
This makes it more resistant to acid de calcification
May increase secondary dentine formation

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16
Q

How does strontium/ potassium chloride work?

A

Strontium ions have strong affinity with calcified tissues

Obliterate dentinal tubules

17
Q

How does formaldehyde work?

A

Precipitates protein in tubules reducing sensitivity

18
Q

What are resins and adhesives?

A

Seal and protect
Seals off tubules
Contains fluoride and triclosans

Plaque Related Disease (18 decks)

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