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oral histology > Eruption and Shedding > Flashcards

Eruption and Shedding Flashcards

1
Q

what is eruption

A

The movements of a tooth from its formative stages within the jaws to its functional stage in the oral cavity

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2
Q

why does a tooth move physiologically

A

moves in all directions except apically and continues to move throughout its existence in the oral cavity

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3
Q

Stages of Eruption

A

Preemergences
Prefunctional
Functional

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4
Q

Main direction of movement in the Preemergence phase

A

Facially

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5
Q

Main direction of movement in the prefunctional stage

A

Occlusially

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6
Q

Main direction of movement during the functional stage

A

Mesially

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7
Q

when does the tooth move into the functional stage

A

Once it reaches the occlusal plane

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8
Q

what is the early bone that surrounds the tooth

A

Boney Crypt

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9
Q

what occures priot to root dentin formation

A

Appearance of dental lamina and continues to the appearances of reduced enamel epitheliuma nd Hertwig’s root sheath

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10
Q

what is the main movement in the Preemergeces stages

A

Facially

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11
Q

what does the 4 layesr of the enamel organ become after enamel formation is complete

A

Reduced enamel epithelium

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12
Q

where is the cervical loop

A

Outer and inner layers of enamel organ come together

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13
Q

where the outer and inner layers of the enamel organ come together

A

Hertwig’s epithelial root sheath

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14
Q

what does the reduced enamel epithelium attach to

A

Attached to completed enamel surface via a basal lamina

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15
Q

what is the last secretion of the ameloblasts

A

Basal lamina

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16
Q

what is enamel made out of if it stains well

A

out of mostly organic matterial

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17
Q

what are the functions of Hertwig’s epithelial root sheath

A

Determines root detnin outline

Determines number of root canals of the tooth

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18
Q

does the roots form during the preemergences stages

A

Preemergences is before the start of root formation

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19
Q

when does Hertwig’s root sheath determines number of root canals

A

Before the start of root dentin formation

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20
Q

when does Hertwig’s root sheath determine root dentin outline

A

At the start of root dentin formation

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21
Q

during what stage does Odonotogenesis begin

A

During the preemergences stage

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22
Q

what cells differenciate during preemergence stage

A

Ameloblasts, odontoblasts, and fibroblasts

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23
Q

what parts of the tooth form during preemergence

A 
Apearance of crown dentin
Enamel formation begins
Appearances of pulp change
DEJ forms
Reduced enamel epithelium forms
Formation of HErtwigs epithelial root sheath
Root canal number forms
Bone crypt remodelled
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24
Q

what parts of tooth formation occure in the preemergence stage

A

Epithelial stages and tooth germ apearances

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25
Q

How does the Prefunction stages begin

A

with root dentin formation

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26
Q

when does the prefunctional stage end

A

when the tooth reaches the occlusial plane

27
Q

Parts of the prefunctional stages

A

Root formation
Merger
Emergence

28
Q

how is Reduced enamel epithelium attached to the enamel surface

A

Via a basal lamina

29
Q

How does Cementum begin to form around the tooth

A

The Hertwig’s epithelial root sheath begins to break up below the enamel to form the cementum

30
Q

what are the apical ends of HERS

A

area of diaphragm part during prefunctional stage of reuption

31
Q

what covers the Root dentin along the prefunctional stage

A

Hertwig’s sheath over the root dentin surface

32
Q

what happens to the root sheath during the diafragm stage

A

number of root canal determines and the tooth erupts occlusially from this level

33
Q

what happens as the Root sheath elongates

A

Determines the root dentin outline

diaphragm remains at relatively the same level

34
Q

what happens to the root sheath as root dentin forms

A

Sheath breaks up

Cementum forms on exposed dentin

35
Q

how long does the process of Root dentin forming, sheath breaking up and cememntum forming occure for

A

Continues apically until root dentin outline is completed

36
Q

what are epthelial rest of Malassez

A

Remanents of epithelial cells from Hertwigs root sheath in the periodontal ligament

37
Q

when does Epithelial rest of Malassez

A

During prefunctional stage of eruption

38
Q

what happens to the tooth right before eruption

A

The merged oral epithelium and reduced enamel epithelium undergo cell death (then the most coronal part emerges into the oral cavity)

39
Q

why does a baby cry during teething

A

Not cut the tooth is moving through the oral epithelium, but because food can get caught and infect ( cells die on their own)

40
Q

What does the Reduced enamel epithelium become

A

The junctional epithelium

41
Q

where does the junctional epithelium exist

A

Between the enamel and the gingiva

42
Q

how does the Junctional epithelium attach to the enamel and the lamina propria of the free gingiva

A

the basal lamina

43
Q

what begins being formed in the prefunctional stage

A

Root dentin
Epithelial rest of Malassex
Cementoblasts and cementum
Periodontal ligament site (collagen fibers bunfle)
changing of reudced enamel epithelium to junction epithelium of free jingiva

44
Q

what breaks up during the prefuctional stage

A

Hertwig’s epithelial root sheath

45
Q

How are collagen fiber bundles of the PDL arranged in the prefunctional stage

A

Not functionall (arranged obliquely

46
Q

How is the junctional epithelium attached to the tooth during the prefunctional stage

A

Via the basal lamina

47
Q

why does the tooth move mesially during the functional stage of eruption

A

Physiologic mesial drift

48
Q

when does the functional stage of eruption end

A

continues throughout life

49
Q

how does the junctional epithelium change during functional eruption

A

attached to enamel
attached to enamel and cementum
attached to cementum

50
Q

what happens to the principle fibers bundles of the PDL during the functional stage of eruptions

A

Functional arrangement of principle fibers

51
Q

what changes occur during funcation eruption

A 
attrition 
Dead tracts
reparative (teritary) dentin
continued dentin formation
reduced pulp tissue volume
ectopic mineralizion
52
Q

what happens to the alveolar process during the functional stage

A

Maintenance (preservation) of alveolar process (remodeled bone crypt

53
Q

where does reciprocal induction occur during the functional stage

A

between the junctional epithelium and adjacent connective tissue (lamina propria

54
Q

what is shedding

A

The phsiologic elimination of primary teeth caused by the resorptive action of odontoblasts

55
Q

what causes shedding

A

physiologic odontoblastic activity

56
Q

where does the odonotoclast originate

A

in the bone marrow

57
Q

how does the odontoclast get to the site of activty

A

by blood vessels

58
Q

What do Odontoclasts do

A

Resorb the 3 mineralized tissues of the tooth

59
Q

what do odontoclasts look like

A

like osteoclasts (multinucleated giant cell made in the bone marrow)

60
Q

what side does the permanat dentition come from under the tooth

A

Via the lingual side

61
Q

what happens if the reduced enamel epithelium breaks down

A

the enamel is subject to damage

62
Q

the openings in the bone located lingual to the primary anterior teeth

A

Gubernaculum canals

63
Q

what passes through the gubernaculum canal

A

A gubernaculum ligament

64
Q

what is the roll of the gubernaculum ligmanet

A

passes through the canal to the dental follicle of a succeedaneous tooth and guide it to the oral cavity

oral histology (14 decks)

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