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DDS1-histology > periodontium > Flashcards

periodontium Flashcards

1
Q

gomphosis

A
  • cementum
  • PDL
  • alveolar bone
  • gingiva
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2
Q

enamel organ is derived from

A

oral ectoderm

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3
Q

after mineralization, ameloblasts

A

shrink from columnar to cuboidal cells

-become part of the “reduced enamel epithelium”

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4
Q

what eventually surrounds the enamel

A

reduced enamel epithelium

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5
Q

2 cell types of REE

A
  1. reduced ameloblasts (cannot divide)

2. external cells (can divide)

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6
Q

external cells of REE eventually give rise to

A

junctional epithelium

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7
Q

proliferation steps

A
  • proliferative cells (basal, adjacent to gingiva ct) migrate up
  • ameloblasts displaced and eventually all are exfoliated
  • JE replaces REE, from coronal end downwards
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8
Q

3 parts of gingival epithelium

A
  • oral epithelium
  • sulcular epithelium
  • junctional
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9
Q

oral epi

A

-Keratinized or para keratinized

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10
Q

sulcular epi

A

NON-keratinized

-permeable => allow flow of GCF

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11
Q

junctional epi

A
  • base of sulcus
  • joins gingiva to tooth
  • 0.71-1.35mm
  • 15 - 30 cells thick (coronal
  • 4-5 cells thick (apical)
  • NON-keratinized
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12
Q

cells attach to tooth surface (enamel) by

A

hemi desmosomes

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13
Q

in disease state, the gingival fibers

A

migrate down as the bone gets destroyed

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14
Q

can grow a new attachment after a disease

A

long junctional epi

*only on root surface below CEJ

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15
Q

muco-gingival junction

A

marks the change from NK to K

-between alveolar mucosa (NK) and attached gingiva (K)

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16
Q

biologic width

A

distance between level of bone and CEJ

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17
Q

biologic width

A

JE + connective tissue attachment

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18
Q

5 types of gingival fibers

A

1) dentogingival
2) alveologingival
3) circular
4) dentoperiosteal
5) transeptal

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19
Q

dentogingival

A
  • most numerous

- cementum to free and attached gingiva

20
Q

alveologingival

A

alveolar crest to free and attached gingiva

21
Q

circular

A

goes around the soft tissue of the tooth

22
Q

dentoperiosteal

A

cementum, over the alveolar crest, and into bone

23
Q

transeptal

A

between teeth

24
Q

5 types of PDL fibers

A
  • alveolar crest
  • horizontal
  • oblique
  • apical
  • interradicular
25
Q

alveolar crest

A

cementum below CEJ downward towards alveolus

26
Q

horizontal group

A

(below alveolar crest) goes to bone

27
Q

oblique

A
  • most numerous

- cementum upward to alveolar bone

28
Q

apical

A

apical cementum to alveolar bone

29
Q

interradicular

A

between roots of multirooted teeth (molars)

30
Q

white opaque layer that shows up on radiograph

A

lamina dura

31
Q

PDL

A

found -between cementum and inner cortical plate of alveolar bone
-specialized CT that provides supportive, nutritive, and sensory function

32
Q

osteoclasts and odontoclasts are derived from

A

blood borne macrophages

33
Q

how is PDL formed

A
  • unorganized CT initially
  • short fiber bundles extend
  • ligament mesenchymal cells secrete TYPE I COLLAGEN which assemble into bundles
  • remodled into PDL (from CEJ downwards)
34
Q

2 ways of classifying cementum

A

cellular connotation or fibrillar connotation

35
Q

cellular connotation

A

1) acellular

2) cellular

36
Q

acellular cementum

A
  • no cells

- provides attachment

37
Q

cellular cementum

A
  • cementocytes

- adaptive role

38
Q

fibrillar connotation

A

1) intrinsic
2) extrinsic
3) mixed
4) afibrillar

39
Q

intrinsic

A
  • fibers made by CEMENTOBLASTS

- parallel to cementum surface

40
Q

extrinsic

A
  • sharpey’s fibers
  • continuous with PDL
  • made by PDL FIBROBLASTS
  • perpendibular to cementum surface
  • tooth anchorage
41
Q

mixed

A

both extrinsic and intrinsic

42
Q

afibrillar

A

no type I collagen fibers

43
Q

cementum types

A

1) acellular afibrillar (AAC)
2) acellular extrinsic fiber (AEFC)
3) cellular intrinsic
4) cellular mixed

44
Q

acellular afibrillar cementum (AAC)

A
  • no fibrils or cementocytes
  • produced by CEMENTOBLASTS
  • pre-eruptive enamel maturation
  • CORONAL cementum
45
Q

acellular extrinsic fiber cementum (AEFC)

A
  • type I collagen, part of sharpeys fibers and continuous with PDL
  • made by FIBROBLASTS
  • densely packed
  • pre and post eruptive
  • CERVICAL 2/3 OF ROOT
  • TOOTH ANCHORAGE
46
Q

cellular intrinsic fiber

A
  • cementocytes
  • intrinsic fiber (made from CEMENTOBLASTS)
  • pre and post
  • SITES OF REPAIR
47
Q

cellular mixed

A
  • APICAL THIRD OF ROOT AND FURCATIONS
  • cementoblasts trapped => cementocytes
  • intrinsic run between extrinsic (not as dense)
  • extrinsic more irregular path
  • CEMENTOBLASTS AND FIBROBLASTS

DDS1-histology (15 decks)

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