PGCEE MDS 2022: Collum angle is seen in:

 # Collum angle is seen in:

a) Class I bimaxillary protrusion

b) Class II div 1

c) Class II div 2 

d) Class III

The correct answer is C. Class II div 2.

The angle which is formed by the intersection of the long axes of the crown and root angulation is called Collum angle. It is decreased in Class II Div 2 cases. Due to this reason the crown appears to be lingual from the long axis of the roots in class II div 2 cases. Collum angle has been confused with interincisal angle. Interincisal angle is decreased in Class II div 1 and increased in class II div 2.