3/14/17 The periodontium II TEST #3

Question 1

Where do cementoblasts arise from?

Answer 1

-HERS

Question 2

Where do odontoblasts arise from?

Answer 2

-Dental papilla

Question 3

Where is cementum thinnest at?

Answer 3

-CEJ (20-50 um)

Question 4

Where is cementum thickest at?

Answer 4

-Apex (150-200 um)

Question 5

Does cementum grow outwards or inwards?

Answer 5

-Outwards

Question 6

What is the inorganic component of cementum?

Answer 6

-Hydroxyapatite

Question 7

What is the organic component of cementum?

Answer 7

-Type I collagen (90%)

Question 8

What other types of collagen besides Type I are found in cementum?

Answer 8

• Type III

- Type XII

Question 9

How much inorganic and organic material do you have in cementum?

Answer 9

• 50%

- 50%

Question 10

Cells from what become cementoblasts?

Answer 10

-Dental follicle

Question 11

What induces cells in the dental follicle to become cementoblasts?

Answer 11

• HERS

- Dentin

Question 12

HERS cells that break off become what?

Answer 12

-Rests of Malassez

Question 13

HERS cells that remain attached to roots can from what?

Answer 13

-Enamel Pearls

Question 14

What percent of the CEJ overlap when the cementum overlaps the enamel?

Answer 14

-60%

Question 15

What percent of the CEJ meet?

Answer 15

-30%

Question 16

What percent of the CEJ has a gap?

Answer 16

-10%

Question 17

T/F An individual can have all three of the CEJ joinings.

Answer 17

True

Question 18

What are the two subtypes of cementum?

Answer 18

• Celular (secondary)

- Acellular (primary)

Question 19

If you don’t have any encapsulated cells (cementoblasts) what subtype of cementum do you have?

Answer 19

-Acellular

Question 20

The secondary (cellular) cementum has what type of fibers?

Answer 20

-Intrinsic fibers

Question 21

The primary (acellular) cementum has what type of fibers?

Answer 21

-Extrinsic

Question 22

Where do you find for Cellular intrinsic fibers?

Answer 22

-Apex of the root

Question 23

How does acellular extrinsic fiber cementum form?

Answer 23

-The predentin forms in the roots, followed by the cementoblasts sending processes into the predentin to produce collagen fibers

Question 24

After 15-20 um of deposition of cementum, synthesis of what stops?

Answer 24

-Collagen

Question 25

After collagen synthesis stops in the formation of AEFC, what proteins are produced to induce mineralization?

Answer 25

-Non-callagenous proteins

Question 26

Collagen fibers from the developing PDL fibroblasts merge with the "fibrous fringe" and mineralize in place forming what?

Answer 26

-Sharpey's fibers

Question 27

In the CIFC what happens to cementoblasts?

Answer 27

-They become entrapped in the advancing cementum

Question 28

T/F Cementoid is visible at the surface of CIFC

Answer 28

True

Question 29

T/F Inner cementoblasts are generally the only vital part of cementum

Answer 29

False | -They are generally non-vital

Question 30

Which subtype of cementum has no cementoid?

Answer 30

-AEFC

Question 31

What subtype of cementum has no cells inside?

Answer 31

-AEFC

Question 32

What subtype of cementum is more laminar?

Answer 32

-CIFC

Question 33

What type of cementum has cells encapsulated?

Answer 33

-CIFC

Question 34

What subtype of cementum has slower deposition?

Answer 34

-AEFC

Question 35

What subtype of cementum has cementoid visible?

Answer 35

-CIFC

Question 36

What subtype of cementum is often absent in canines and incisors?

Answer 36

-CIFC

Question 37

What subtype of cementum more mineralized?

Answer 37

-AEFC

Question 38

IF you see the granular layer of Tome's in a picture where might you be in the tooth?

Answer 38

-Root

Question 39

What subtype of cementum has functionality that is the attachment of PDL to Cementum?

Answer 39

-AEFC

Question 40

What subtype of cementum has functionality that has some attachment, and adaptation and adjustment for wear?

Answer 40

-CIFC

Question 41

What is mixed cementum?

Answer 41

Alternating layer of AEFC and CIFC

Question 42

Where do you find intermediate cementum?

Answer 42

-Between granular layer of Tomes and dental cementum proper

Question 43

What is an abnormal thickening of cementum known as?

Answer 43

-Hyper cementosis

Question 44

T/F When hypercementosis occurs the tooth can become ankylosed.

Answer 44

True

Question 45

T/F Alveolar Bone is more resistant to resorption that cementum

Answer 45

False | -Cementum is more resistant to resorption than alveolar bone

Question 46

The periodontium is generally affected by five types of tooth movements?

Answer 46

- Tipping - Bodily movement - Extrusive movement - Intrusive movement - Rotational movement

Question 47

What are three factors that determine the degree of the effect of applied force?

Answer 47

- Transduction - Time - Magnitude of force

Question 48

What are the net results of tooth movements from compression?

Answer 48

- On the side which tooth moves | - Resorption of alveolar bone

Question 49

What is the net result of tooth movement from undermining resorption?

Answer 49

- Occurs in conjugation with hyalinization | - Resorption occurs on the opposite surface of compressed bone

Question 50

What is the net result of tooth movement from hyalinization?

Answer 50

- results from too great or too rapid a compression force | - Loss of cell activity and vascularity

Question 51

What is the net results of tooth movement from tension?

Answer 51

- On the side opposite to compression | - Formation of alveolar bone