Hypodontia

Question 1

What is ‘hypodontia’?

Answer 1

Congenital absence of one or more teeth

Question 2

What is ‘severe hypodontia’?

Answer 2

6 or more congenitally absent teeth (excluding 8s)

Question 3

How common is hypodontia?

Answer 3

6% permanent dentition

0.9% primary dentition

Question 4

Which teeth are most likely to be affected by hypodontia?

Answer 4

• L5
• U2
• U5
• L1

Question 5

How is hypodontia presented?

Answer 5

• Delayed/ asymmetric eruption
• Retained/ infra-occluded primary tooth
• Absent primary tooth
• Tooth form

Question 6

What conditions are associate with hypodontia?

Answer 6

• MICRODONTIA
• CLP
• Malformed other teeth
• Short root
• Taurodontism
• Enamel hypoplasia

Question 7

What are the potential problems with hypodontia?

Answer 7

• Space
• Drifting
• Over-eruption
• Aesthetics
• Functional

Question 8

How are missing upper lateral incisors managed?

Answer 8

1. Accept
2. Restorative alone
3. Combination ortho & rest

Question 9

What are the treatment options for an ‘open space’ approach for missing upper lateral incisors?

Answer 9

• RBB
• Implant
• Conventional bridgework
• RPD
• Autotransplantation

Question 10

What are the treatment options for a ‘closed space’ approach for missing upper lateral incisors?

Answer 10

• Simple
• Space closure plus =
  
  • -> make canine look like lateral: extrusion, reshape and bleach
  • -> make premolar look like canine: intrusion, rotate and build up in comp