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Oral Histology > Eruption and Shedding > Flashcards

Eruption and Shedding Flashcards

1
Q

Eruption definition

A

The movement a tooth makes to attain and maintain its position in the jaw

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2
Q

T/F - Tooth movement only occurs as it is erupting

A

False - Tooth movement occurs throughout life

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3
Q

What direction(s) does a tooth move to attain and maintain its position in the jaw?

A

All directions, except apically

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4
Q

Why type of activity is involved in movements of eruption?

A

Cellular activity involving different cell types of the periodontal ligament (PDL)

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5
Q

What is the most numerous cell type of the PDL contributing to tooth movements?

A

Fibroblast

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6
Q

What are the functions of a fibroblast within the PDL?

A

Secrete extracellular substance (fibroblast)
Lysis extracellular substance (fibroclast)
Contracting cell (fibromyocyte)

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7
Q

What is a fibromyocyte myofibroblast?

A

A cell connected o collagen fiber bundles that connect the tooth to the alveolar bone
When it contracts, the collagen fibers contract, moving the tooth

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8
Q

What are the stages of eruption?

A

Preemergence
Prefunctional
Functional

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9
Q

When does the Preemergence occur?

A

Before the start of root formation

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10
Q

What is the main tooth movement direction during the Preemergence stage?

A

Facially (however, they move in all different directions, but the net movement is facial)

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11
Q

What appears during the preemergence stage?

A

Reduced enamel epithelium

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12
Q

What attaches the reduced enamel epithelium to the enamel?

A

Basal lamina

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13
Q

Cervical loop

A

Outer and inner epithelial layers coming together to form Hertwig’s epithelial root sheath

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14
Q

Functions of Hertwig’s epithelial root sheath

A

Determines how many root canals

Determines the root-dentin outline

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15
Q

What about Herwig’s epithelial root sheath determines root canals?

A

The number of openings in Hertwig’s diaphragm

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16
Q

When does the prefunctional stage occur?

A

Begins with root dentin formation and ends when the tooth reaches the occlusal plane

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17
Q

What is the main tooth movement direction of the Prefunctional stage?

A

Occlusally

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18
Q

What happens to Hertwig’s epithelial root sheath during the Prefunctional stage

A

The sheath covers the root dentin, the apical end continues as the diaphragm, and the sheath breaks up

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19
Q

Epithelial rest of Malassez

A

Remnants of epithelial cells from Hertwig’s epithelial root sheath in the PDL
Appear during prefunctional stage of eruption

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20
Q

What happens to reduced enamel epithelium during the prefunctional stage?

A

The merged oral epithelium and reduced enamel epithelium undergo cell death

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21
Q

When does functional stage of eruption occur?

A

When the tooth reaches the occlusal plane and continues throughout life

22
Q

What is the main tooth movement direction during the Functional stage?

A

Mesially

23
Q

What happens to the PDL during the funcitonal stage?

A

Functional arrangement of principal fiber bundles occurs

24
Q

What happens to junctional epithelium during the functional stage?

A

It changes position

25
Q

Shedding

A

The physiologic elimination of primary teeth caused by the resorptive action of odontoclasts

26
Q

What causes shedding

A

Odontoclastic activity

27
Q

Odontoclasts origin

A

Bone marrow and goes to the site of activity via blood vessels

28
Q

Odontoclasts

A

Resorb the 3 mineralized tissues of teeth

29
Q

What stage does odontogenesis begin?

A

Preemergence

30
Q

What stage do Ameloblasts, odontobalsts, and fibroblasts differentiate?

A

Preemergence

31
Q

What stage does the crown dentin appear?

A

Preemergence

32
Q

What stage does enamel formation and maturation begin?

A

Preemergence

33
Q

What stage is the DEJ established?

A

Preemergence

34
Q

What stage does the reduced enamel epithelium appear?

A

Preemergence

35
Q

What stage does the pulp chamber appear?

A

Preemergence

36
Q

What stage is Hertwig’s epithelial root sheath form?

A

Preemergence

37
Q

What stage is the number of root canals determined?

A

Preemergence

38
Q

What stage does the bone crypt form?

A

Preemergence

39
Q

Bone crypt

A

Undergoes remodeling and becomes the alveolar process

40
Q

What stage does the root dentin form?

A

Prefuncitonal

41
Q

What stage does Hertwig’s epithelial root sheath break up?

A

Prefunctional

42
Q

What stage does the Epithelial rest of Malassez form?

A

Prefunctional

43
Q

What stage do cementoblasts differentiate and cementogenesis occur?

A

Prefunctional

44
Q

What stage does the PDL and alveolar process form?

A

Prefuncitonal

45
Q

What stage are the collagen fiber bundles of the PDL arranged obliquely?

A

Prefunctional

46
Q

What stage does the reduced enamel epithelium merge with the oral epithelium?

A

Prefuncitonal

47
Q

What stage does the tooth emerge into the oral cavity?

A

Prefunctional

48
Q

What stage does the reduced enamel epithelium become the junctional epithelium of the free gingiva?

A

Prefunctional

49
Q

What stage are the principal fiber bundles of the PDL functionally arranged?

A

Functional stage

50
Q

What stage is the alveolar process preserved?

A

Functional stage

51
Q

What stage is secondary and tertiary dentin formed?

A

Functional stage

52
Q

What is the junctional epithelium movement during the functional stage?

A

It moves from its attachment to just enamel, to enamel and cementum, and then to just cementum

Oral Histology (12 decks)

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