Hypodontia

Question 1

Define hypodontia

Answer 1

Congenitally absent presence of one or more teeth

Question 2

Most common missing tooth

Answer 2

U2s,5s,8s,lower incisors

Question 3

Aetiology of hypodontia (3)

Answer 3

Genetics

Syndromic
- CL(P), DS, Ectodermal dysplasia

Environmental
- Trauma, cancer tx

Question 4

Presentation of hypodontia

Answer 4

• Delayed or asymmetric eruption
• Retained or infra-occluded primary
• Absent primary tooth

Question 5

Associated dental problems with hypodontia (5)

Answer 5

Spacing
Drifting
OE
Aesthetics
Function

Question 6

GDP management of hypodontia

Answer 6

Full exam
- Xrays, photos, study models

Question 7

Open space vs close space option for missing upper laterals

Answer 7

Open space
- RBB
- Implant
- RPD
- Conventional bridgework
- Autotransplantation

Close space
- Simple (just close gaps nothing more)
- Space closure plus (close then make teeth look as natural as possible)

Question 8

Ideal abutment for RBB

Answer 8

Canine

Question 9

Why is a canine an ideal abutment for RBB?

Answer 9

Root length
Crown dimensions
Less shine through

Question 10

Space required for implant

Answer 10

7mm