Tooth Eruption and Exfoliation- Exam III Flashcards

1
Q

The primary and permanent dentition develop _____ as the jaws increase in size from infancy to adolescence

A

simultaneously

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2
Q

Jaws of the infant accommodate development of:

A

20 deciduous teeth

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3
Q

At 4-5 years of age, the jaws accomodate:

A

20 deciduous erupted teeth and 28 developing teeth

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4
Q

The mixed dentition stage occurs at ____ years of age

A

8-12 years

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5
Q

Involves the concomitant exfoliation of deciduous teeth and eruption of permanent teeth

A

mixed dentition stage

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6
Q

Defined as the movement of a tooth from its site of development within the alveolar process to its functional position in the oral cavity:

A

tooth eruption

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7
Q

What three stages is tooth eruption divided into?

A
  1. pre-eruptive phase
  2. pre-functional eruptive phase
  3. functional phase (post-eruptive phase)
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8
Q

Pre-eruptive tooth movement results from: (3)

A
  1. growth of the jaws
  2. growth of tooth buds
  3. remodeling of the walls of the bony crypt
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9
Q

Results when there is resorption of the mesial wall with concomitant apposition of bone on the distal wall

A

mesial migration

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10
Q

In the pre-eruptive phase, overtime the jaws increase in: (4)

A
  1. length of jaw (anterior-posterior)
  2. width of jaw (coronal plane_
  3. alveolar ridge height
  4. buccal-lingual width of the alveolus
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11
Q

In the pre-eruptive phase, what region does crowding occur due to the tooth germs rapid growth?

A

anterior region

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12
Q

In the pre-eruptive phase, as the jaws increase in length, the crowding is alleviated by migration of the teeth ____ which allows a more even distribution

A

distally

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13
Q

In the pre-eruptive phase, with an increased jaw size, teh developing teeth move:

A

outward (facially) and towards the oral cavity (upward or downward)

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14
Q

In the pre-eruptive phase, because of the jaw length, the permanent developing molars have _____ prior to and during eruption and achieve ____ only when the jaw length is sufficient to allow it

A

angled inclinations; vertical alignment

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15
Q

What are the five components to the theories of tooth eruption:

A
  1. root growth
  2. vascular pressure
  3. selective bone deposition and resorption
  4. pulpal pressure
  5. periodontal and gingival fiber ligaments
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16
Q

Theories of tooth eruption:

Elongation of the roots in relation to stability of the fundus of the socket

A

root growth

17
Q

Theories of tooth eruption:

Increased hydrostatic pressures in the apical dental sac or periodontal ligament

A

vascular pressure

18
Q

Theories of tooth eruption:

Coronal bone resorption concomitant with bone apposition in the fundus area

A

selective bone deposition and resorption

19
Q

Theories of tooth eruption:

Tissue pressure differential in the pulp compared to the PDL

A

pulpal pressure

20
Q

Theories of tooth eruption:

Cells (myofibroblasts) exert traction on the tooth through the collagen network and cell-to-cell contacts

A

periodontal and gingival fiber ligaments

21
Q

Theories of tooth eruption:

Of the numerous causes of tooth eruption, the most frequently cited are:

A
  1. root growth
  2. alveolar bone remodeling
  3. PDL formation
22
Q

Other factors that influence tooth eruption include:

A
  1. PTH
  2. MMPs produced by fibroblasts, osteoclasts and macrophages
23
Q

The gubernacular canal plays a role in:

A

eruptive phase

24
Q

A strand of connective tissue that contains remnants of dental lamina epithelium (derived from the succesional lamina)

A

gubernacular canal

25
During the eruptive phase, the rate of eruption is not constant but vest described as a "burst of eruption" that averages about:
3mm every 3 months
26
During the functional phase of tooth eruption and exfoliation, we see what two types of wear?
1. occlusal surface wear 2. proximal wear (mesial drift)
27
Occurs during the functional phase, and is caused by oblique fiber groups of the PDL continually pulling the tooth into occlusion as enamel is abraded:
occlusal surface wear
28
Apical cementum deposition also serves as a compensatory eruptive mechanism to continual:
occlusal abrasion
29
Mesial inclination of teeth in full contact will yield an anterior force vector and when coupled with the pull of transseptal fibers, results in:
mesial drift
30
Cell mediated tooth resorption involves the:
odontoclast
31
The odontoclast involved in cell mediated tooth resorption during exfoliation is derived from monocytes that exit capillaries to become connective tissue _____ which in turn fuse together to form a syncytium of large multinucleated giant cells that function like an osteoclast
macrophages
32
Odontoclasts degrade both the collagenous and non-collagenous matrix of _____ and ___ (lysosomal enzymes) and hydroxyapatite mineral phase (acids)
cementum and dentin
33
specialized fibroblast-like cells that are thought to destroy the collagen fibers of the PDL associated with the resorbing tooth root:
Fibroclast
34
Fibroclasts are thought to destroy the:
collagen fibers of the PDL
35
The finding of apoptotic cell death in the resorbing PDL suggests that shedding of teeth is:
a programmed event