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Oral Biology 2020 > 3/7/17 The periodontium I TEST #3 > Flashcards

3/7/17 The periodontium I TEST #3 Flashcards

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1
Q

What is the periodontium?

A

-Tissues that invest and support the tooth

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2
Q

What are the three principal components of the periodontium?

A
  • Alveolar Process
  • Cementum
  • Periodontal Ligament
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3
Q

How does the periodontium develop?

A

-Interactions of mesenchyme, HERS, and dental follicle

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4
Q

What type of joint is the tooth in?

A

-Gomphosis

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5
Q

What are four types of cells used to form the periodontium?

A
  • Osteoblasts
  • Cementoblasts
  • PDL fibroblasts
  • Odontoblasts
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6
Q

Where do the osteoblasts that form the periodontium arise from?

A

-Surrounding mesenchymal tissues

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7
Q

Where do the cementoblasts that form the periodontium arise from?

A

-HERS/Follicle Cells: Ectomesenchymal cells

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8
Q

What is the origin of HERS?

A

-Epithelial cells

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9
Q

HERS influences mesenchymal cells to form what two types of cells that help form the periodontium?

A
  • 1st Cementoblasts

- 2nd PDL fibroblasts

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10
Q

What type of bone deposition is the alveolar process formed by?

A

-Intramembranous ossification

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11
Q

When does alveolar process formation begin?

A

-8 weeks in utero

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12
Q

T/F Crypts develop around tooth germs, such that they eventually form the sockets

A

True

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13
Q

The alveolar process develops substantially during what event that is under the influence of the dental follicle?

A

-Tooth eruption

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14
Q

T/F The alveolar process is not remodeled throughout life

A

False

It is remodeled throughout life

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15
Q

In an Anodontic individual what happens with the alveolar process?

A

-Alveolar process development impaired

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16
Q

What type of bone do you find in the alveolar bone proper (lines the tooth socket most directly)?

A

-Compact Bone

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17
Q

What structures make up the alveolar bone proper?

A
  • Cribriform plate (Anatomical term)

- Lamina dura (radiographic term)

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18
Q

What type of bone do you find in the supporting alveolar bone?

A

-Compact and Trabecular bone

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19
Q

What structures do you find in the supporting alveolar bone?

A
  • Cortical plates (Compact bone)

- Central spongiosa (trabecular bone)

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20
Q

T/F The Cribriform plate in the alveolar bone proper have Volkmann’s canals running through it

A

True

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21
Q

The Lamina dura is an area of attachment for what?

A

-PDL

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22
Q

The bundle bone is another name for the alveolar bone proper in a histological sense that contains what types of fibers embedded in bone?

A

-Sharpey’s fibers

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23
Q

Is the inner or outer part of the alveolar bone proper remodeled more?

A

-Inner part

24
Q

Does the alveolar bone consist more of woven bone or lamellar bone?

A

-Woven bone

25
Q

What does the inner cortical plate of the supporting alveolar bone consist of?

A

-Lingual and palatal surface

26
Q

What does the outer cortical plate of the supporting alveolar bone consist of?

A

-Labial and buccal surface

27
Q

What is the alveolar crest?

A

-Junction of cortical plate and alveolar bone proper

28
Q

The alveolar crest is thinnest in the ______ and thickest in the ________ of the ______.

A
  • Maxilla
  • Pre-molar region
  • Mandible
29
Q

What is the interradicular septum?

A

-Bony septum between roots of a single tooth

30
Q

What is the interalveolar septum?

A

-Bony septum between adjacent teeth

31
Q

What are the four functions of the alveolar bone?

A
  • Protection and structure of the sockets for the tooth to rest in
  • Attachment of Sharpey’s fibers of the PDL which are embedded in bone
  • Support of tooth rots, especially facial/lingual
  • Distribution of loading from the tooth and PDL to the surrounding bone
32
Q

Ectomesenchyme cells from what differentiate into fibroblasts which produce and organize collagen fibers in an oblique oreintation?

A

-Dental follicle

33
Q

T/F PDL fiber orientation changes with eruption

A

True

34
Q

What is the range of width for the PDL?

A

.15 -.38 mm

35
Q

T/F The PDL width decreases with age

A

True

36
Q

What types of collagen do you find in the PDL?

A
  • Type I
  • Type III
  • Type XII
37
Q

What is the main elastic fiber of the PDL?

A

-Oxytalan

38
Q

What is Oxytalan largely associated with in the PDL?

A

-Vasculature

39
Q

Where is the concentration of nerve ending in the PDL generally the greatest at?

A

-Tooth apex except upper incisors (in coronal labial part)

40
Q

What are the four types of nerve endings in the PDL?

A
  • Free nerve endings
  • Ruffini’s Corpuscles
  • Coiled nerve endings
  • Spindle nerve endings
41
Q

What type of nerve endings are the most prevalent in the PDL?

A

-Free nerve endings

42
Q

What type of nerve endings are bulbous dendritic endings that are slow adapting mechanoreceptive fibers?

A

-Ruffini’s Corpuslces

43
Q

What are the five histological groups of fibers in the PDL?

A
  • Alveolar crest
  • Horizontal
  • Oblique
  • Apical
  • Interradicular
44
Q

What histological group fiber attaches just at the CEJ and runs outwards to attach into the alveolar socket rim?

A

-Alveolar crest

45
Q

What histological group fiber of the PDL runs from cementum at a right angle to the tooth into the alveolar socket?

A

-Horizontal Group

46
Q

What histological group fiber of the PDL are most numerous and run at an oblique angle from the cementum most of the way down the root?

A

-Oblique groups

47
Q

What histological group fiber of the PDL run from the root apex to the underlying bone?

A

-Apical groups

48
Q

What histological group fiber of the PDL are found only on multi-rooted teeth and they attach to the interradicular septum?

A

-Interradicular group

49
Q

T/F The gingival ligament is part of the PDL proper

A

False

-Not part of the PDL proper

50
Q

T/F The gingival ligament is intimately associated with the periodontium

A

True

51
Q

What are the five main bundles that make up the gingival ligament?

A
  • Dentogingival group
  • Alveologingival group
  • Circular group
  • Dentoperiosteal groups
  • Transseptal Fibers
52
Q

What gingival ligament bundle is the most numerous and run from the cervical cementum to lamina propria of the free and attached gingiva?

A

-Dentogingival group

53
Q

What gingival ligament bundle run from cementum just under the junctional epithelium, over the alveolar crest and into the cementum of an adjacent tooth and is a significant cause of orthodontic relapse?

A

-Transseptal fibers

54
Q

What gingival ligament bundle run apically from cementum to the periosteum of the outer cortical plate?

A

-Dentoperiosteal group

55
Q

What gingival ligament bundle are circular bands around the neck of the tooth , and attaches to other fibers and the free gingiva?

A

-Circular group

56
Q

What gingival ligament bundle run from the alveolar crest to the lamina propria of free/attached gingiva?

A

-Alveologingival group

Oral Biology 2020 (21 decks)

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