Bleaching of root filled teeth

Question 0

Why do teeth become darker with physiological aging?

Answer 0

Deposition of secondary dentine
Incorporation of extrinsic stains
Wearing down of enamel

Question 1

What are the steps for bleaching teeth?

Answer 1

1) Confirm endodontic and coronal status of the tooth
2) Apply rubber dam
3) Base layer over root filling (Cavit/GIC/IRM)
4) Place bleach over labial wall of pulp chamber (Sodium perborate/ carbamide peroxide/ hydrogen peroxide)

Question 2

What is the difference between hue, value, chroma?

Answer 2

Hue: Descriptive term to enable one to distinguish between families of colour
Value: Relative lightness or darkness of a colour
Chroma: Degree of colour saturation and describes the strength of a colour as it changes

Question 3

What does the normal colour of teeth depend on?

Answer 3

The blue, pink and green tints of the enamel which is reinforced by the yellow to brrown shades of dentine

Question 4

What are some causes of intrinsic discolouration?

Answer 4

• Amelogenesis imperfecta
• Congenital hyperbilirubinaemia
• Dentinogenesis imperfecta
• Tetracycline staining
• Fluorosis
• Aging