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Perio > Module 3 > Flashcards

Module 3 Flashcards

1
Q

Define the cementum

A

calcified layer of connective tissue that makes up the outer covering of the root surface and provides the means of attachment for the connective tissue fibers to the tooth surface

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2
Q

How many types of cementum are there?

A

4

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3
Q

What are the 2 main types of cementum?

A

acellular and cellular

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4
Q

throughout life cementum __________ in thickness

A

increase

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5
Q

What seals the open tubules and protects the dentin

A

cementum

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6
Q

what attaches the periodontal fibers to the tooth

A

cementum

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7
Q

cementum helps compinsate for _________ to maintain vertical dimension of periodontium through the formation of secondary cementum

A

attrition

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8
Q

What is largely mineralized with densely packed collagen fibers and ground substance

A

mature cementum

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9
Q

Cementum has direct blood vessels or nerves T/F

A

False

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10
Q

______ and ______ participate in the formation of cementum

A

fibroblasts and cementoblasts

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11
Q

What are largely involved in production of acelluar extrinsic cementum

A

PDL fibroblasts

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12
Q

What is acelluar cementum also known as?

A

Primary

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13
Q

Where is acelluar cementum found?

A

entire root, but primarily occupies cervical or coronal thrid of all deciduous and permanent teeth

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14
Q

__________ is found at most cervical enamel border

A

Acellular, afibrillar cementum (AAC)

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15
Q

__________ forms both pre/post eruptively and derived from fibroblasts

A

Acelluar extrinsic fiber cementum (AEC)

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16
Q

What makes up most of the structre of AEC

A

Sharpey’s fibers, mineralized surface

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17
Q

What has a principle role in supporting/anchoring the tooth?

A

acellular cementum (AEC)

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18
Q

Sharpey’s fibers are _______ except near the CEJ where they are partially

A

calcified

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19
Q

How thick is the Acelluar Cementum (AEC)

A

30 to 60 microns

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20
Q

What is another name for celluar cementum?

A

secondary

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21
Q

Celluar cementum is _________calcifed than acelluar type

A

Less

22
Q

WHen is celluar cementum formed?

A

after the tooth reaches the occlusal plane

23
Q

What are the characteristics of cellular cementum?

A

irregular, thicker, and can contain cells which can communicate with eachother

24
Q

Where is celluar cementum the thickest?

A

in the apical half and furcation regions of the root

25
Q

Celluar cementum is depositied and resorbed in response to functional demand T/F

A

True

26
Q

_________ contains no sharpeys fibers

A

celluar intrinsic fiber cementum (CIC)

27
Q

_________ does contain some sharpeys fibers, is also comprised of the acellular extrinsic fiber cementum

A

cellular mixed fiber cementum (CMF)

28
Q

How thick is cellular cementum?

A

150 - 200 microns

29
Q

why is it important to know about cementum?

A
  • help patients understand perio health

- we can remove cementum

30
Q

What is root planing?

A

intentional removal of cementum

31
Q

What is root debridement?

A

try to avoid removal of cementum

32
Q

What happens if there is no cementum

A

no attachment of fiber bundle= mobility and tooth loss

33
Q

_____ cementum overlaps enamel

A

60%

34
Q

_______cementum meets enamel

A

30%

35
Q

______cementum gap from enamel

A

10%

36
Q

WHy is it imporant to know the percentages of CEJ

A
  • fluoride use for sensitivity
  • instrumentation
  • caries
37
Q

Cementum is softer than______

A

bone, enamel or dentin

38
Q

What is the thickness of cementum?

A

varies
thinner on coronal portion
thicker on distal rather than mesial

39
Q

Where is the greatest thickness of cementum found?

A

apical, bifurcated and trifurcated areas

40
Q

What is ankylosis?

A

attachement of the cementum of the tooth to the alveolar bone

41
Q

WHen does ankylosis occur?

A

after chronic PA infectoin or occlusal trauma

42
Q

what is often seen with ankylosis?

A

resorbiton of root and replacement by bone tissue

43
Q

What does ankylosis do to the PDL?

A

obliterates it

44
Q

How do we detect ankylosis?

A

xray and clinically (tooth below height of occ plane)

45
Q

What is hypercementosis?

A

prominent thickening of the cementum

46
Q

Is hypercementosis localized or generalized

A

it can be both

47
Q

How do we dectect hypercementosis?

A

radiographically

48
Q

What is concrescence?

A

cemental union of 2 teeth

49
Q

Where is concrescence seen most frequently?

A

macially molar region

50
Q

Why does concrescence usually occur?

A

from excessive deposition of cementum, close proximity of teeth/roots

51
Q

What causes cementum resorbtion?

A

trauma, ortho movement, pressure from mal-aligned teeth, cysts and tyumors, perio disease

52
Q

Is cementum resorbtion local or systemic?

A

It can be both or can be idiopathic

Perio (11 decks)

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