QUIZ 3 Eruption and Shedding Flashcards Preview

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Flashcards in QUIZ 3 Eruption and Shedding Deck (58)
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1

what are the 5 types of physiologic tooth movements?

  • preeruptive
  • eruptive
  • posteruptive
  • shedding
  • avulsion

2

what is preeruptive movement?

positioning of tooth germs prior to eruption

3

what is eruptive movement?

the movement of the tooth into functional occlusion

4

what is posteruptive movement?

movements in compensation for the growth of the jaws/wear.  meant to keep the tooth in occlusion

5

what is shedding movement?

the programmed loss of the primary teeth to make way for the permanent dentition

6

what is avulsion?

an extreme example of non physiologic tooth movement

 

7

___ is the main functional requirement for teeth, as most normal tooth movements are aimed at maintaining the teeth in ___

occlusion, occlusion

8

which permanent teeth have primary counterparts?

incisors, canines, and premolars

9

permanent teeth develop ___ to primary tooth germs

lingually

consider the successional laminae

10

the permanent teeth and primary tooth germs start in the same crypt, but eventually develop what?

their own separate crypt in the bone

11

in the development of permanent teeth, the dental lamina extends backwards to give rise to which permanent teeth?

the 1st, 2nd, and 3rd molars

12

the development of permanent and primary teeth cause a fair amount of ___.  as the mandible/maxilla grow, tooth germs have to ___

  • crowding
  • shift around

13

in preeruptive movement, primary teeth move into position for eruption, and then what happens to the developing permanent teeth?

they shift into an apical position where they have primary counterparts

14

describe the preeruptive movement of maxillary and mandibular molars

  • maxillary molars:
    • first, occlusal surface arrive distally, and then they shift down into place when there is room
  • mandibular molars:
    • follow preeruptive movement of the maxillary molars
    • these have a more mesial inclincation, which swing into occlusion when there is room (or not)

15

preeruptive movement of the maxillary molars is followed by ___

the mandibular molars

16

in what ways are movements of the tooth germ accomplished?

  1. the whole tooth germ moves 
  2. directional growth 

17

how does the tooth germ maintain its relative position as the jaw lengthens and grows in height?

the tooth germ moves either by the whole tooth germ moving or by directional growth

18

preeruptive movements take place in a bony crypt, and thus are associated with what?

bone resorption and/or deposition

19

___ movements position the tooth for eruption and occur as the tooth germ develops

preeruptive

20

___ movement results in an increase in length, while ___ growth results in an increase in height

  • bodily 
  • directional/eccentric

21

eruptive tooth movements are ___ or ___

axial or occlusal

22

the actual eruption of the primary tooth into the mouth is only the final stage.  much more behind the scenes work happens to ___

align the tooth properly

23

in primary eruptive tooth movement, fusion of the ___ with the ___ creates an epithelium lined channel through which the tooth emerges

  • oral epithelium
  • reduced enamel epithelium (REE)

24

the permanent successional tooth forms in a ___ under the primary tooth

second bony crypt

25

describe permanent eruptive tooth movement

  • permanent successional tooth forms in a second bony crypt under the primary tooth
  • a channel, called the gubernacular canal, develops between the alveolar bone around the primary tooth and the permanent tooth as it erupts
  • the permanent tooth erupts through the gubernacular canal

26

at what rate does the permanent tooth erupt?

  • intraosseous: 1-10 um/day
  • in canal: up to 75 um/day

27

what is the gubernacular canal?

  • a channel that develops between the alveolar bone around the primary tooth and permanent tooth as it erupts
  • it forms along the remnants of the dental lamina attached to the lamina propria (gubernacular cord)

28

what are the 4 theories of the forces that drive eruption?

  • bone remodeling theory
  • root growth theory
  • vascular pressure theory
  • cushion hammock theory

29

describe the bone remodeling theory of eruption

  • bone deposits under an erupting tooth propelling it outwards
  • problems:
    • removal of dental follicle = no bone remodeling and thus no eruption
    • replica "teeth" placed in an intact follicle still form an eruption pathway

30

describe the root growth theory of eruption

  • root formation pushes the tooth outwards
  • problems:
    • pushing against what?
    • not enough root to account for the movement to occlusal plane
    • if you cut off the roots, a tooth will still erupt