2 - Theories of Craniofacial Growth

Question 1

Genetics + environment =

Answer 1

Epigenetics

Question 2

What keeps the teeth and jaws in their position?

Answer 2

Balance of forces

Question 3

Is the duration or force or the magnitude more important?

Answer 3

Duration of force

Question 4

Describe what Equilibrium theory is

Answer 4

1. Balance of forces keeps teeth and jaw in position
2. Duration of force more important

Question 5

Should there be a balance between cheek pressure and tongue posture?

Answer 5

Yes

Question 6

What would cause unfavorable dentoalveolar growth?

Answer 6

1. Mouth breathing
2. Sleep apnea

Question 7

What are the dental effects of mouth breathing?

Answer 7

1. Anterior open bite
2. Maxillary incisor protrusion
3. Mandibular incisor protrusion
4. Narrowing of maxilla
5. Mandibular retrusion

Question 8

This is the epiphysis of long bones

Answer 8

Growth centers

Question 9

These are responsible for the growth of long bones

Answer 9

Growth centers

Question 10

Do growth centers respond to tension or pressure?

Answer 10

No

Question 11

Describe growth centers?

Answer 11

1. Epiphysis of long bones
2. Don’t respond to mechanical stimuli
3. Cells are layered
4. You can transplant and they will have same function

Question 12

Mandibular condyles, sutures, tuberosities have growth sites or centers?

Answer 12

Growth sites

Question 13

In Growth sites or centers are cells layered?

Answer 13

Growth centers

Question 14

What kind of cells are in growth sites?

Answer 14

Immature fibrocartilaginous cells (not layered)

Question 15

Do growth sites respond to mechanical stimulation?

Answer 15

Yes

Question 16

In growth sites, if you have tension (pull bone), what happens?

Answer 16

Bone growth

Question 17

In growth sites, if you have pressure (push bone), what happens?

Answer 17

No bone growth

Question 18

Describe growth sites

Answer 18

1. Immature fibrocartilaginous cells (not layered)
2. Cannot transplant
3. Found in cranio-facial complex
4. Sensitive to mechanical stimulation

Question 19

Do growth sites or growth centers grow more?

Answer 19

Growth centers

Question 20

Growth sites or centers are genetically programmed?

Answer 20

Growth centers

Question 21

Are growth sites or centers less affected by the environment?

Answer 21

Growth centers

Question 22

Can you transplant growth sites or growth centers so that they have the same function?

Answer 22

Only growth centers

Question 23

Where are growth centers NOT found? Except?

Answer 23

Cranio-facial complex
Only in the cranial base