intrinsic tooth discolourisation

Question 1

8 causes of discolourisation.

Answer 1

1. age
2. trauma
3. caries
4. fluorosis
5. amelogenesis imperfecta
6. dentinogenesis imperfecta
7. tetracycline staining
8. chronological hyperplasia

Question 2

4 types of bleaching

Answer 2

1. vital
2. non-vital (allows bleaching of deeper dentine)
3. home bleaching (10% carbamide peroxide)
4. in-surgery bleaching (30-35% carbamide peroxide)

Question 3

Pros and cons of composite resin veneers to hide discolouration.

Answer 3

• Any severe discolouration may need to be bleached first.
• Less destructive than crowns.
• May need replacing after 4 years due to shrink, staining and wear.

Question 4

Porcelain Veneers as a treatment option for staining,

Answer 4

• Less destructive.
• Bonded to etched enamel.

Question 5

Crowns as a tx option for staining.

Answer 5

• aesthetic and retentive.
• destructive in prep.

Question 6

What percentage of hydrogen peroxide is used for whitening?

Answer 6

6% HP

(this is the same as 12% carbamide peroxide which causes less hypersensitivity)