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Dental Anatomy Exam 5 > Chapter 21 > Flashcards

Chapter 21 Flashcards

1
Q

When does root formation begin?

A

Begins after the outline of the crown has been established but before the full crown is calcified

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2
Q

Layers of OEE and IEE make up what?

A

Epithelial root sheath (Hertwig’s epithelial root sheath)

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3
Q

Epithelial root sheath (Hertwig’s epithelial root sheath)

A

Begin to undergo rapid miotic division and grow deep into the underlying connectice tissues - The beginning of root formation

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4
Q

Dentinocemental junction

A

Some epithelial root sheath cells do not pull away and may become ameloblasts, forming small globes of enamel on the surface of the dentin

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5
Q

Enamel pearls

A

Found in bifurcations and trifurcations of roots

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6
Q

A hard, yellowish substance covering the root of the tooth

A

Cementum

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7
Q

% of inorganic hydroxypatite crystals in cementum

A

45% to 50%

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8
Q

% of organic components of water in cementum

A

50% to 55%

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9
Q

CEJ

A

First seen at the cervical line of the tooth, also called the cementoenamel

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10
Q

How many different relationships with the enamel of the crown

A

3

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11
Q

60% of the cases of cementum

A

overlaps the enamel

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12
Q

30% the cementum meets

A

the enamel at a sharp junctions

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13
Q

10% of the cases the cementum

A

and enamel do not meet, leaving dentin exposed at the cervical line

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14
Q

Acellular cementum

A

All of the cementoblasts remain on the surface rather than becoming trapped within the cementum

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15
Q

Where is acellular

A

In the cervical two thirds of the root

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16
Q

Cellular cementum

A

More vital than acellular cementum and therefore more responsive to remodeling itself

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17
Q

Where is cellular cementum

A

Apical 1/3 of the root

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18
Q

The cellular at the apex of the root tends to

A

inrease in thickness with the passage of time and as a result of stress causing thickening (hypercementosis)

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19
Q

Makes extraction a bit more difficult than usual

A

Hypercementosis

20
Q

Periodontal membrane (ligament)

A

Forms the middle of the layer of cells in the old dental sac, the ends of the periodontal fibers become surrounded by cementoblasts, whose secretion hardens around the ends of the fibers, attaching them to the cementum

21
Q

Parts of the periodontal ligament embedded in cementum are known as

A

Sharpey’s fibers

22
Q

Sharpey’s fibers (SF)

A

Parts of the PDL surrounded by cementum on the tooth side and alveolar bone on the opposite side in the wall of the tooth socket

23
Q

Alveolar bone

A

Is the bone of the upper or lower jaw that makes up the sockets for the teeth

24
Q

3 layers of alveolar bone

A

Cortical plate
Cribiform plate or alveolar bone proper
Spongy or cancellous bone

25
Q

First layer of alveolar bone

A

Layer of compact bone on the buccal or lingual surface is referred to as the cortical plate of bone.

26
Q

Second layer of alveolar bone

A

Called the cribriform plate or alveolar bone proper. Radiographically it is referred to as the lamina dura

27
Q

Bundle bone

A

The tooth socket is constantly being remodeled and additional bone laid down on the cribriform plate

28
Q

A thickened lamina dura is caused by

A

bundle bone being laid down on the cribriform plate and is an indication of occlusal trauma to that tooth or teeth

29
Q

Between the coritcal plate and cribriform plate

A

Layer of spongy or cancellous bone (3rd layer)

30
Q

Spongy bone is a

A

bone marrow

31
Q

Interproximal alveolar crest

A

The spongy bone and the crest of bone that joins two sockets

32
Q

Three groups of the periodontal ligament

A

Gingival fibers, transseptal fibers, and alveolodental fibers

33
Q

After a person has had a root canal on a tooth, it is still possible to feel pain at times from the

A

periodontal ligament

34
Q

Gingival fibers

A

Run from the cementum into the free and attached gingival area; support the gingiva

35
Q

Circular gingival fibers

A

run around the tooth in free gingiva and hold gingiva against the tooth

36
Q

Transseptal fibers

A

Run from the cementum of the interproximal portion of one tooth, across the alveolar crest of bone, to the cementum of the interproximal portion of the adjacent tooth; hold the teeth in interproximal contact

37
Q

Alveolodental fibers

A

Run from cementum to alveolar bone

38
Q

what are the alveolodental fiber groups

A 
Alveolar crest group
Horizontal group
Oblique group
Apical group
Interradicular group
39
Q

Alveolar crest group

A

Runs from cementum, slightly apical to the alveolar crest of bone; helps resist horizontal movements of teeth

40
Q

Horizontal group

A

Runs from cementum horizontally to the alveolar crest; helps resist horizontal movement

41
Q

Oblique group

A

runs from cementum cornily into the alveolar bone; main fiber group for resisting occlusal stresses

42
Q

Apical group

A

Runs from apex of the tooth into the adjacent alveolar bone; resists forces trying to pull the tooth from its socket

43
Q

Interradicular group

A

Found only on multirooted teeth; runs from the alveolar crest of the bone between the roots of the tooth to adjacent cementum; resists the forces trying to remove the tooth

44
Q

What happens when a tooth is lost

A

The posterior to the missing tooth will tilt forward into the unoccupied space (mesial drift)

45
Q

If a tooth if moved too fast in orthodontic treatment

A

It is possible that the fibers attaching the tooth to bone will be torn out of their attachment; Before they can be re-embedded, the tooth could conceivably loosen and be lost or could cause external root resorption

Dental Anatomy Exam 5 (4 decks)

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