Class 2 Div2

Question 1

What is class 2 div 2

Answer 1

Lower incisor edge lies posterior to cingulum plateau of upper incisor
Upper central incisors retroclined
Overjet can be reduced or increased

Question 2

Soft tissues of class 2 div 2

Answer 2

High resting lower lip line- secondary to decreased LAFH- retroclined upper incisors
Marked labiomental fold
High masseteric forces
Upper 2s shorter clinical crown- may trap lower lip

Question 3

Vertical skeletal pattern

Answer 3

Reduced FMPA
Prominent chin- progenia

Question 4

Dental features

Answer 4

Retroclined upper and lower incisors
Deep OB
OJ usually reduced
Class 2 buccal segments
Increased inter-incisal angle
Upper laterals thin with poorly developed cingulum

Question 5

Why treat

Answer 5

Aesthetics
Dental health: traumatic OB

Question 6

Tx options

Answer 6

Accept
Growth modification
Camouflage
Orthognathic tx

Question 7

When would u do growth modification

Answer 7

Growing pt
Boys 14+/-2 yrs
Girls 12+/-2 yrs

Question 8

FAs

Answer 8

Modified twin block
Springs or screws
Upper sectional fixed appliance

Question 9

How do u correct increased inter incisal angle

Answer 9

Palatal root torque
Proclination of lower incisors

Question 10

Main risk of upper torque

Answer 10

Root resorption