Etiology of Deep and Open Bites

Question 1

The vertical overlap of the incisals in centric relation.

Answer 1

Overbite

Question 2

Excessive vertical overlap.

Answer 2

Deep bite

Question 3

Usually lead to supraeruption, and thus a deep bite.

Answer 3

1) Class II arches

2) Early loss of the primary canines.

Question 4

Characteristics of a deep bite.

Answer 4

Over-eruption of lower incisors and excessive curve of Spee.

Question 5

Causes a skeletal deep or open bite?

Posterior cranial base to the ramus has excessive vertical growth.
Lack vertical growth between the maxillry posterior teeth and the anterior cranial base.

The closing direction is counterclockwise.

Lower anterior face height from subnasale to submenton is shortened.

Answer 5

Deep bite

Question 6

Skeletal deep or open bite?

• Midface usu. retrusive
• Thin lips.
• Prominent labio-mental sulcus.
• Small teeth tendency
• Powerful masticatory musculature.

Answer 6

Skeletal deep

Question 7

Causes of what kind of bite?

• Lose posterior teeth.
• Attrition and decreased crown height.
• Agenesis of posterior teeth.

Answer 7

Closed bite

Question 8

What kind of bite has a lack of vertical overlap/contact?

Answer 8

Open

Question 9

In an open bite, the planes of the face are convergent or divergent?

Answer 9

Divergent

Question 10

The posterior face height is about half the anterior face height.

Answer 10

Skeletal open bite.

Question 11

The 4 planes of the face are PARALLEL in this type of bite.

Answer 11

Closed

Question 12

The 4 planes of the face are DIVERGENT in this type of bite.

Answer 12

Open