Eruption and Shedding Flashcards

(52 cards)

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?

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
Shedding
The physiologic elimination of primary teeth caused by the resorptive action of odontoclasts
26
What causes shedding
Odontoclastic activity
27
Odontoclasts origin
Bone marrow and goes to the site of activity via blood vessels
28
Odontoclasts
Resorb the 3 mineralized tissues of teeth
29
What stage does odontogenesis begin?
Preemergence
30
What stage do Ameloblasts, odontobalsts, and fibroblasts differentiate?
Preemergence
31
What stage does the crown dentin appear?
Preemergence
32
What stage does enamel formation and maturation begin?
Preemergence
33
What stage is the DEJ established?
Preemergence
34
What stage does the reduced enamel epithelium appear?
Preemergence
35
What stage does the pulp chamber appear?
Preemergence
36
What stage is Hertwig's epithelial root sheath form?
Preemergence
37
What stage is the number of root canals determined?
Preemergence
38
What stage does the bone crypt form?
Preemergence
39
Bone crypt
Undergoes remodeling and becomes the alveolar process
40
What stage does the root dentin form?
Prefuncitonal
41
What stage does Hertwig's epithelial root sheath break up?
Prefunctional
42
What stage does the Epithelial rest of Malassez form?
Prefunctional
43
What stage do cementoblasts differentiate and cementogenesis occur?
Prefunctional
44
What stage does the PDL and alveolar process form?
Prefuncitonal
45
What stage are the collagen fiber bundles of the PDL arranged obliquely?
Prefunctional
46
What stage does the reduced enamel epithelium merge with the oral epithelium?
Prefuncitonal
47
What stage does the tooth emerge into the oral cavity?
Prefunctional
48
What stage does the reduced enamel epithelium become the junctional epithelium of the free gingiva?
Prefunctional
49
What stage are the principal fiber bundles of the PDL functionally arranged?
Functional stage
50
What stage is the alveolar process preserved?
Functional stage
51
What stage is secondary and tertiary dentin formed?
Functional stage
52
What is the junctional epithelium movement during the functional stage?
It moves from its attachment to just enamel, to enamel and cementum, and then to just cementum