CLASS II DIV 2

Question 1

What is the incidence of Class II div 2 malocclusions?

Answer 1

5-18%

Question 2

What is the BSI definition of a class II div 2 malocclusion?

Answer 2

• The lower incisor occludes posterior to the cingulum plateau of the upper incisor
• Upper incisors are retroclined
• Overjet is reduced but can also be increased

Question 3

What AP Skeletal class is normally associated with a Class II Div 2 malocclusion?

Answer 3

Mild/moderate skeletal class 2 base

Question 4

What do the soft tissues of a class II div 2 malocclusion present as clinically?

Answer 4

• high resting lower lip line
• marked labio-mental fold
• high masseteric forces

Question 5

How does the vertical skeletal pattern present in Class II Div 2 malocclusions?

Answer 5

• reduced vertical height
• reduced FMPA angle
• prominent chin

Question 6

What type of growth is a class II div 2 malocclusion normally associated with?

Answer 6

forward rotational pattern of growth of the mandible

Question 7

Why can the lower lip sometimes become trapped in Class II Div 2 malocclusions?

Answer 7

upper 2’s shorter clinical crown

Question 8

What dental features are associated with a class II div 2 malocclusion?

Answer 8

• lower incisors may occlude with upper incisors or palatal mucosa
• retroclination of the upper centrals
• upper 2s often crowded
• reduced arch length

Question 9

What is different about the lateral incisors in a class II div 2 malocclusion?

Answer 9

• upper 2s often crowded
• upper 2s mesio-labially rotated
• poor cingulum on lateral incisors

Question 10

What dental anomalies are sometimes associated in patients with a class II div 2 malocclusion?

Answer 10

• impacted canine
• lateral incisors microdontia

Question 11

Why do we need to treat class II div 2 malocclusions?

Answer 11

• traumatic overbite
• aesthetic concerns

Question 12

What do orthodontic treatment options depend on?

Answer 12

• severity of malocclusion
• age & motivation of patient
• dental health
• patients concerns

Question 13

what management options are available for class II div 2 malocclusions?

Answer 13

• accept
• growth modification
• camouflage
• orthognathic treatment

Question 14

When would you accept a class II div 2 malocclusion with no treatment?

Answer 14

• acceptable aesthetics
• pt not concerned
• overbite not a significant problem

Question 15

At what age is it most appropriate to treat girls with growth modification methods?

Answer 15

12 +/- 2 years

Question 16

At what age is it most appropriate to treat boys with growth modification methods?

Answer 16

14 +/- 2 years

Question 17

What functional appliances can be used to procline the upper incisors of a class II div 2 malocclusion?

Answer 17

• modified twin block
• springs or screw
• upper sectional fixed appliance

Question 18

How can the inter-incisal angle of a class II div 2 malocclusion be corrected?

Answer 18

• palatal root torque upper incisors
• proclination of lower incisors

Question 19

When should you refer a patient with a class II div 2 malocclusion to a specialist?

Answer 19

• significant skeletal component
• deep traumatic overbite