Classification of malocclusion

Question 1

What is orthodontics ? list 2

Answer 1

Study of growth of the craniofacial complex
The prevention and correction of occlusal anomalies or malocclusion

Question 2

On facial examination what should you check

Answer 2

Horizontal or transverse
Vertical
Sagital

Question 3

What does a radiographic assessment assess

Answer 3

Skeletal assessment - relationship between maxilla and mandible

Question 4

3 types of crossbite

Answer 4

Anterior crossbite
Posterior buccal crossbite
Posterior lingual crossbite

Question 5

What is an anterior crossbite

Answer 5

Reverse overjet (class III)

Question 6

What is a posterior buccal crossbite

Answer 6

Lower arch is wider than the upper - buccal cusps of lower occlude lateral to buccal cusps of upper teeth

Question 7

What is lingual crossbite

Answer 7

Lower buccal teeth occlude lingually to upper buccal teeth

Question 8

Aetiology of crossbite

Answer 8

Skeletal pattern
Soft tissue pattern
Dental effects

Question 9

Normal occlusion: Andrews six keys what are they

Answer 9

1. correct molar relationship
2. correct crown angulation (mesial, distal tilt)
3. correct crown inclination (not proclined)
4. No rotations
5. Tight contacts
6. Flat occlusal plane (no overbite)

Question 10

Upper canine is important for development what should you check if delayed eruption of upper canine

Answer 10

palpate buccal sulcus to feel
If variation is over 6 months take radiograph