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Oral Biology 2020 > 3/14/17 The periodontium II TEST #3 > Flashcards

3/14/17 The periodontium II TEST #3 Flashcards

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1
Q

Where do cementoblasts arise from?

A

-HERS

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2
Q

Where do odontoblasts arise from?

A

-Dental papilla

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3
Q

Where is cementum thinnest at?

A

-CEJ (20-50 um)

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4
Q

Where is cementum thickest at?

A

-Apex (150-200 um)

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5
Q

Does cementum grow outwards or inwards?

A

-Outwards

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6
Q

What is the inorganic component of cementum?

A

-Hydroxyapatite

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7
Q

What is the organic component of cementum?

A

-Type I collagen (90%)

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8
Q

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

A
  • Type III

- Type XII

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9
Q

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

A
  • 50%

- 50%

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10
Q

Cells from what become cementoblasts?

A

-Dental follicle

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11
Q

What induces cells in the dental follicle to become cementoblasts?

A
  • HERS

- Dentin

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12
Q

HERS cells that break off become what?

A

-Rests of Malassez

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13
Q

HERS cells that remain attached to roots can from what?

A

-Enamel Pearls

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14
Q

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

A

-60%

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15
Q

What percent of the CEJ meet?

A

-30%

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16
Q

What percent of the CEJ has a gap?

A

-10%

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17
Q

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

A

True

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18
Q

What are the two subtypes of cementum?

A
  • Celular (secondary)

- Acellular (primary)

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19
Q

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

A

-Acellular

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20
Q

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

A

-Intrinsic fibers

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21
Q

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

A

-Extrinsic

22
Q

Where do you find for Cellular intrinsic fibers?

A

-Apex of the root

23
Q

How does acellular extrinsic fiber cementum form?

A

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

24
Q

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

A

-Collagen

25
Q

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

A

-Non-callagenous proteins

26
Q

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

A

-Sharpey’s fibers

27
Q

In the CIFC what happens to cementoblasts?

A

-They become entrapped in the advancing cementum

28
Q

T/F Cementoid is visible at the surface of CIFC

A

True

29
Q

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

A

False

-They are generally non-vital

30
Q

Which subtype of cementum has no cementoid?

A

-AEFC

31
Q

What subtype of cementum has no cells inside?

A

-AEFC

32
Q

What subtype of cementum is more laminar?

A

-CIFC

33
Q

What type of cementum has cells encapsulated?

A

-CIFC

34
Q

What subtype of cementum has slower deposition?

A

-AEFC

35
Q

What subtype of cementum has cementoid visible?

A

-CIFC

36
Q

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

A

-CIFC

37
Q

What subtype of cementum more mineralized?

A

-AEFC

38
Q

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

A

-Root

39
Q

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

A

-AEFC

40
Q

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

A

-CIFC

41
Q

What is mixed cementum?

A

Alternating layer of AEFC and CIFC

42
Q

Where do you find intermediate cementum?

A

-Between granular layer of Tomes and dental cementum proper

43
Q

What is an abnormal thickening of cementum known as?

A

-Hyper cementosis

44
Q

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

A

True

45
Q

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

A

False

-Cementum is more resistant to resorption than alveolar bone

46
Q

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

A
  • Tipping
  • Bodily movement
  • Extrusive movement
  • Intrusive movement
  • Rotational movement
47
Q

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

A
  • Transduction
  • Time
  • Magnitude of force
48
Q

What are the net results of tooth movements from compression?

A
  • On the side which tooth moves

- Resorption of alveolar bone

49
Q

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

A
  • Occurs in conjugation with hyalinization

- Resorption occurs on the opposite surface of compressed bone

50
Q

What is the net result of tooth movement from hyalinization?

A
  • results from too great or too rapid a compression force

- Loss of cell activity and vascularity

51
Q

What is the net results of tooth movement from tension?

A
  • On the side opposite to compression

- Formation of alveolar bone

Oral Biology 2020 (21 decks)

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