Eruption and Shedding Flashcards

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1
Q

Positioning of the tooth germs prior to eruption is __________ Whereas movement of the tooth into functional occlusion is __________ and movements in compensation for growth of the jaws/wear is ________

A

Pre-eruptive, eruptive, posteruptive

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2
Q

The programmed loss of primary teeth is referred to as ________ whereas an extreme example of non-physiologic tooth movement such as a tooth being knocked out is called _________

A

Shedding, Avulsion

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3
Q

In what position do maxillary molars arrive?

A

occlusal surface distally, then shifts down into place when there is room

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4
Q

In what position do mandibular molars arrive?

A

Mesial inclination, then swing into occlusion when there is room

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5
Q

What are the two primary preeruptive tooth movements?

A
  • Bodily movement (whole tooth term moves)

- Directional/eccentric growth

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6
Q

In primary tooth eruption, the oral epithelium fuses with the reduced enamel epithelium to create what?

A

an epithelium lined channel for the tooth emerge through

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7
Q

Permanent successional teeth form their own bony crypt under the primary tooth. A channel also develops between the alveolar bone around the primary tooth (lingualy) and is called what?

A

Gubernacular Canal

*Forms along the remnants of the dental lamina attached to the lamina propria. Moves 1-10 um/day in intraosseous, up to 75 um/day in canal

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8
Q

What are 4 less plausible theories for tooth eruption?

A

1-Bone remodeling theory (bone deposits under tooth propel it out)
2-Rooth Growth theory (growing root pushes out)
3-Vascular pressure theory (hydrostatic pressure from vessels push it out)
4-Cushion hammock theory (magic ligament pushes it out)

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9
Q

What is the most likely theory for tooth eruption currently?

A

PDL fibroblasts pull against each other and collagen bundles to force the tooth outward.

*rootless teeth also erupt however. Dental follicle is the most critical for eruption

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10
Q

What are the 4 key tissue resorption mediators for eruption?

A

1-Colony stimulating factor-1
2-Interleukin 6
3-Interleukin 1a
4-Monocyte chemotactic protein-1

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11
Q

What are the 5 key tissue formation mediators for eruption?

A
1-BMP-2
2-BMP-6
3-Runx2 
4-TGFB
5-EGF
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12
Q

What causes remodeling of PDL fibers and bone deposition?

A

Tension

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13
Q

What causes remodeling of PDL fibers and bone resorption?

A

Compression

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14
Q

What process lasts roughly 10-20 days after initial compression and involves the damage to cells in the PDL, slowing remodeling?

A

Hyalinization

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15
Q

How does the tooth undergo post eruptive tooth movement to compensate for occlusal wear?

A
  • PDL helps move tooth

- New bone/cementum deposition

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16
Q

In which direction to teeth tend to move to compensate for inter proximal wear?

A

mesially

*transseptal ligament fibers of the PDL also play an important role

17
Q

Incisors/canines resorb the lingual surface when shedding whereas the primary molars resorb where?

A

interradicular dentin and roots

18
Q

What resorbs the hard tissue in tooth shedding?

A

Odontoclasts (basically osteoclasts)

19
Q

What are 3 factors leading to tooth shedding?

A

1-Pressure from erupting permanent tooth
2-Increased mechanical instability (absorption of roots)
3-Resorption of other hard and soft tissues

20
Q

Generally symmetrical in terms of left-right, what sequence do we need to memorize for this class as well as the boards?

A

Shedding/Eruption