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Histopathology > Tooth eruption and exfoliation > Flashcards

Tooth eruption and exfoliation Flashcards

1
Q

the primary and permanent dentitions develop ____ as the jaws increase in size from infancy to adolescence

A

simultaneously

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2
Q

do mandible and maxilla grow at same rates or different

A

same

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3
Q

how many teeth do the jaw accomodate at 4-5 years of age

A

20 erupted teeth and 28 developing teeth

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4
Q

how many teeth do the jaws accomadate at age 8-12

A

mixed dentition stage that involves the concomitant exfoliation of deciduous teeth and eruption of permanent teeth

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5
Q

what is the definition of tooth eruption

A

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

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6
Q

what are the 3 stages of tooth eruption

A

-pre-eruptive stage
-pre functional eruptive stage/eruptive stage
- functional phase/post eruptive phase

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7
Q

what happens in the pre-eruptive stage

A

growth of the jaws, tooth buds and the remodeling of the body crypt

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8
Q

how do teeth growth into their position

A

distally then mesially

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9
Q

what does mesial migration of teeth result from

A

resportion of the mesial wall with comitant apposition of bone on the distal wall

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10
Q

in what ways do the jaws increase in size

A

-length (anterior posterior)
- width (coronal plate)
-alveolar ridge height
- buccal-lingual width of alveolus

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11
Q

when the teeth start to grow where does crowding occur

A

anteriorly

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12
Q

as the jaws increase in length, the crowding is alleviated by ____

A

migration of teeth distally which allows for more even distribution

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13
Q

how do the teeth move with increased jaw size

A

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

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14
Q

because of the jaw length, the permanent developing molars have ____

A

angled inclination mesially prior to and during eruption and achieve vertical alignment only when jaw length is sufficient to allow it

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15
Q

what are the theories of tooth eruption

A

root growth
- vasscular pressure
-selective bone deposition and resorption
-pulpal pressure
-periodontal and gingival fiber ligaments

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16
Q

what are the theories of tooth eruption rooted in/based on

A

-root growth, bone remodeling, and periodontal ligament formation
- PTH
-MMPs produced by fibroblasts, osteoclasts, and macrophages

17
Q

what is the theory of root growth as an eruption theory

A

elongation of the roots in relation to stability of the fundus of the socket allows tooth to erupt

18
Q

what is the theory of vascular pressure as an eruption theory

A

increase hydrostatic pressures in the apical dental sac of the periodontal ligament

19
Q

what is the theory of selective bone deposition and resorption as an eruption theory

A

coronal bone resorption concomitant with bone apposition in the fundus area
- shifting of the tooth in an erupted path because you have bone being removed superiorly and bone being deposited inferiorly shifting things upwards into place

20
Q

what is pulpal pressure as an eruption theory

A

tissue pressure differential in the pulp compared to the PDL
- as the tooth grows you decrease pressure in the pulp chamber causing the PDL to increase pressure onto the tooth pushing it upwards

21
Q

what is the eruption theory of peridontal and gingival fiber ligaments

A

cells exert traction on the tooth through the collagen network and cell to cell contacts
-contraction of fibers push tooth up in a coronal direction

22
Q

what happens in the pre-functional eruptive stage/eruptive phage

A

as permanent tooth erupts, causes resorption on deciduous tooth in front of it
- follows its own canal space and remains a connection with the oral epithelium at the top

23
Q

what is the pre fucntional eruptive stage/eruptive stage due to

A

pressure on fundus, root growth, and bone resorption/deposition

24
Q

what is the gubernacular canal

A

eruptive pathway for succedaneous teeth. it is a strand of CT that contains remnants of dental lamina epithelium

25
Q

what is the average rate of eruption

A

3 mm every 3 months

26
Q

what happens with occlusal surface wear in the functional phase/post eruptive phase

A

-oblique fibers of the PDL continually pull the tooth into occlusion as enamel is abraded
-apical cementum deposition also serves as a compensatory eruptive mechanism to continual occlusal abrasion

27
Q

what happens with interproximal wear (mesial drift) in the functional phase/post-eruptive phase

A

-mesial inclination of teeth in full contact will yield an anterior force vector and when coupled with the pull of the transseptal fibers, resulted in mesial drift
-because of this, teeth become more crowded with age

28
Q

what is the definition of exfoliation and what stimulates it

A

removal of primary/deciduous teeth. stimulus from dental follicle of adult tooth stimulates formation of odontoclasts and fibroclasts to degrade primary tooth structures to allow for eruption

29
Q

what is the function of odontoclasts and fibroclasts

A

resorb the root from the apex on lingual surfaces which allows for tooth to start in mesial position to erupt

30
Q

does the adult tooth push on the baby tooth to erupt

A

no, a front clears away for the tooth to have room to erupt

31
Q

what are odontoclasts derived from

A

monocytes that exit capilareis to become CT macrophages. the macrophages then fuse together to form a syncytium that functions like an osteoclast

32
Q

what do odontoclasts do

A

degrade both the collagenous and non-collagenous matrix of cementum and dentin and the hydroxyapatite mineral phase to make room for succedaneous teeth to erupt

33
Q

what are fibroclasts

A

specialized fibroblast-like cells that destroy the collagen fibers of the PDL associated with the resorbing tooth root

34
Q

how do we know that shedding of teeth is a programmed event

A
  • finding of apoptotic cell death in the resorbing PDL
  • tooth eruption in twins reveals teeth shedding is genetic too (80% genetic)
35
Q

what teeth are commonly involved in malocclusion and why

A

canines because they erupt after incisors and premolars

36
Q

what are the examples of malocculsion

A

-excessive mesial drift
- extra anterior teeth
-impaction
-severe malocclusion

Histopathology (14 decks)

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