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Tooth forming structures > Periodontium > Flashcards

Periodontium Flashcards

1
Q

What is periodontium

A

hard/soft tissues which support the tooth in relation to alveolar bone

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2
Q

Structures associated with periodontium

A
  1. Alveolar bone
  2. PDL
  3. Cementum
  4. Tooth gingiva
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3
Q

In health patients can you see the cementum?

A

no, it is not visible

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4
Q

where is cementum thickest and thinnest

A

Thickest at apex

Thinnest at CEJ

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5
Q

Avascular/Vascular?

A

Avascular; no innervation

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6
Q

How long does it form?

A

throughout life

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7
Q

Color of cementum

A

dull/pale yellow

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8
Q

Texture when felt with instrument

A

grainy

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9
Q

what % mineralized

A

65%

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10
Q

How does cementum develop histologically?

A

develops from dental sac and forms on root after disintegration of Hertwigs epithelial root sheath

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11
Q

What do the undifferentiated cells of the dental sac do?

A

they contact newly formed dentin and are induced to cementoblasts which create a matricxthat turns it into cementocytes which then matures into cementum

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12
Q

Microscopic appearances of Cementum

A
  1. Sharpey’s fibers
  2. PDL
  3. Cementocytes: entrapped cementoblasts
  4. CEJ: three junctional patterns–overlap, gap, meet
  5. Cemental repair: apposition from cementoblasts in adjacent PDL
  6. Types of cementum
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13
Q

What are the two types of cementum and characteristics

A
  1. Acellular: forms slowly, can’t change width, and no cementocytes
  2. Cellular: forms rapidly, can change width, and embedded cementocytes
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14
Q

3 characteristics of alveolar bone

A
  1. easily remodeled
  2. vascular
  3. 60% mineralized
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15
Q

Proper portion of alveolar bone

A

lines tooth socket

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16
Q

Supporting portion of alveolar bone

A

all of cortical and trabecular bone

17
Q

Function of Periodontal Ligament

A

anchors tooh

18
Q

Components in PDL

A
  1. Fibroblasts
  2. Cementoblasts
  3. Odontoblasts
  4. Osteoclasts
  5. Epithelial rests of Malassez
19
Q

PDL fibers are formed by

A

collagen

20
Q

Alveolar crest fibers are joined to

A

cervical cementum

21
Q

horizontal fibers are joined from

A

alvelous to cementum

22
Q

oblique fibers run…

A

apical 2/3 of root

also the largest

23
Q

Apical fibers are connect at

A

the apex

24
Q

interradicular fibroblasts are found

A

between roots

25
Q

transseptal fibers join

A

tooth to tooth

Tooth forming structures (4 decks)

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