Class III

Question 1

aetiology of class III skeletal class

Answer 1

1. genetic (small maxilla or large mandible or both)
2. acromegally (env)
3. cleft lip and palate (env)

Question 2

what makes a class III malocclusion and skeletal class more complex to treat

Answer 2

1. AOB
2. > FMPA

Question 3

growth modification tx for class III skeletal class (4)

Answer 3

1. chin cup (historic)
2. reverse twin block (hard tissue - tooth born)
3. frankel III - soft tissue born version
4. bollard implants

Question 4

treatment options for a class III skeletal individual

Answer 4

1. growth modification before or during pubertal growth spurt
2. camouflage (accept underlying skletal cause)
   * only if mild skeletal discrepancy
   * stopped growing
   * try and make teeth in class I relationships
   * extractions - remove from further back in upper and more mesial in lower
3. orthognathic surgery