Class II Div 1

Question 1

Class II div 1 - definition

Answer 1

• lower incisal edges occlude posterior to upper cingulum
• WITH increased OJ
• Uppers proclined OR NORMAL

Question 2

Class II Div 1 - why treat

Answer 2

1. aesthetics
2. > 9mm = double chance of trauma

Question 3

Class II Div 1 - aetiology

Answer 3

1. class II skeletal pattern
2. retrognathic mandible
3. OJ = inclined uppers and skeletal pattern

Question 4

Class II Div 1 - soft tissue issues

Answer 4

• common to have incompetent lips
• lip trap

Question 5

Class II Div 1 - dental factors

Answer 5

1. > OJ
2. overbite sometiems
3. no oro seal = dry mouth and excaberaiton of gingivitis

Question 6

Class II Div 1 - managment

Answer 6

1. accept and monitor
2. teeth tipping
3. camouflage
4. growth modification (tooth born - twin block, soft tissue born = frankel II, fixed = herbst)
5. orthognathic surgery

Question 7

negatives of early (mixed dentition) grwoth modification

Answer 7

• skeletal effects not maintained long term
• 2 stages of tx required (also need it retained until full adult dentition and can get fixed treatment)
• literature shows no difference to waiting until full dentition

Question 8

benefits of later (full adult dentiton) growth modification

Answer 8

• aesthetics better earlier (aesthetics and psychology)
• lower risk of truma
• better compliance