3/2/17 Eruption and Shedding TEST #3

Question 1

What phase of physiologic tooth movement deals with the positioning of tooth germs prior to eruption?

Answer 1

-Preeruptive

Question 2

What phase of physiologic tooth movement deals with the movement of the tooth into functional occlusion?

Answer 2

-Eruptive

Question 3

What phase of physiologic tooth movement deals with the movements in compensation for the growth of the jaws/wear. Meant to keep the tooth in occlusion.

Answer 3

-Posteruptive

Question 4

What phase of physiologic tooth movement deals with the programmed loss of the primary teeth to make way for the permanent dentition?

Answer 4

-Shedding

Question 5

What is an Avulsion?

Answer 5

-An extreme example of non physiologic tooth movement (punched in the face or falling on your face)

Question 6

Where do the successional dental lamina form?

Answer 6

-Lingual to primary tooth germs

Question 7

T/F AS the mandible/maxilla grow, tooth germs have to shift around

Answer 7

True

Question 8

What are two possibilities of how the tooth germ moves?

Answer 8

• The whole tooth germ moves

- Directional growth

Question 9

Where do pre eruptive movements take place?

Answer 9

-Boney crypts

Question 10

What are pre eruptive movements associated with?

Answer 10

• Bone resorption

- Bone deposition

Question 11

T/F Eruptive tooth movements are axial or occlusal

Answer 11

True

Question 12

The fusion of what two structures create an epithelium lined channel through which the tooth emerges?

Answer 12

• REE

- Oral epithelium

Question 13

T/F Permanent successional tooth forms in a second bony crypt under the primary tooth

Answer 13

True

Question 14

There is a channel which develops between the alveolar bone around the primary tooth an the permanent tooth as it erupts. What is the name of this canal?

Answer 14

-Gubernacular canal

Question 15

What erupts through the gubernacular canal?

Answer 15

-Permanent tooth

Question 16

T/F Eruption occurs faster in bone than in the soft tissue

Answer 16

False

-It occurs faster in the soft tissue and slower in the bone

Question 17

What are four theories of the forces that generate eruption of the teeth?

Answer 17

• Bone remodeling theory
• Root growth theory
• Vascular pressure theory
• Cushion Hammock theory

Question 18

What theory of eruption is when bone deposits under an erupting tooth propelling it outward?

Answer 18

-Bone remodeling theory

Question 19

What theory of eruption is when root formation pushes the tooth outwards?

Answer 19

-Root Growth theory

Question 20

What theory of eruption is when blood vessels at the tooth apex push it outwards via hydrostatic pressure?

Answer 20

-Vascular Pressure theory

Question 21

What theory of eruption is when a magic ligament under the tooth pushes it out?

Answer 21

-Cushion Hammock theory

Question 22

T/F Currently, it is though the periodontal ligament, developing after root formation is the driving force for tooth eruption

Answer 22

True

Question 23

T/F Rootless teeth can not erupt

Answer 23

False

-The tooth can still erupt

Question 24

What is critical for tooth eruption?

Answer 24

-Dental sac (follicle)

Question 25

Is IL-6 involved in tissue resorption or tissue formation?

Answer 25

-Tissue resorption

Question 26

Is Colony Stimulating Factor-1 involved in tissue resorption or tissue formation?

Answer 26

-Tissue resorption

Question 27

Is BMP-2 involved in tissue formation or tissue resorption?

Answer 27

-Tissure formation

Question 28

What are three reasons that post eruptive tooth movement occurs?

Answer 28

• Accommodate growing jaws
• Compensate for occlusal wear
• Compensate for inter proximal wear

Question 29

When you have orthodontic movement, you apply gent forces and a tooth that causes remodeling in what to structures?

Answer 29

• Tooth socket

- PDL

Question 30

What does tension of the PDL lead to?

Answer 30

-Remodeling of PDL fibers and bone deposition

Question 31

What does Compression of the PDL lead to?

Answer 31

-Remodeling of PDL fibers and bone resorption

Question 32

If you have damage to cells in the PDL that leads to the loss of cells leading to no remodeling what is that referred to as?

Answer 32

-Hyalinzation

Question 33

What structure most likely helps keep the tooth in occlusion?

Answer 33

-PDL

Question 34

What direction do teeth tend to drift?

Answer 34

-Mesial

Question 35

What fibers of the PDL are also important in ensuring relative tooth movement?

Answer 35

-Transsetptal

Question 36

What are the hard tissues of the tooth resorbed by?

Answer 36

-Odontoclasts