Lec 6: Examination of Chin

Question 1

Normal mentolabial sulcus

Answer 1

Angle’s class I

Question 2

Shallow mentolabial sulcus

Answer 2

Bimaxillary protrusion

Question 3

Deep mentolabial sulcus

Answer 3

Angle’s class II

Question 4

Should the mentalis muscle contract be seen or not during at rest?

Answer 4

NOT seen at rest

Question 5

Hyperactivity of the mentalis muscle may be seen in?

Answer 5

• Class II div 1 malocclusion
• Px with deleterious oral habits

Question 6

Prominent chin

Answer 6

Class III

Question 7

Recessive chin

Answer 7

Class II

Question 8

Angle formed between the lower border of the nose and a line connecting the intersection of the nose and the upper lip with the tip of the upper lip (labiale superius).

Answer 8

Nasolabial sulcus

Question 9

A shallow depression seen below the lower lip.

Answer 9

Mentolabial sulcus

Question 10

Normal range of nasolabial angle?

Answer 10

90-110 degrees

Question 11

Increased nasolabial angle (>90deg)?

Answer 11

Class II div 2
Maxillary anterior retroclination

Question 12

Decreased nasolabial angle (<90deg)?

Answer 12

Class II div 1
Maxillary proclination