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Oral Biology - Quiz 3 > Eruption And Shedding > Flashcards

Eruption And Shedding Flashcards

1
Q

What are the 5 types of physiologic tooth movements?

A

-Pre-eruptive
—Positioning of tooth germs prior to eruption

-Eruptive
—The movement of the tooth into fx occlusion

-Post-eruptive
—Movements in compensation for the growth of the jaws/wear. Meant to keep the tooth in occlusion

-Shedding
—Programmed loss of the primary teeth to make way for the perm dent

-Avulsion
—An extreme example of non-physiologic tooth movement

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2
Q

T/F - Occlusion is the main functional req for teeth, as most normal tooth movements are aimed at maintaining the teeth in occlusion.

A

TRUE

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3
Q

Permanent _______, _________, and ________ have primary counterparts.

A

Incisors

Canines

Premolars

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4
Q

T/F - Perm teeth develop lingually to primary tooth germs.

A

TRUE

*Start in same crypt, but eventually develop their own separate crypt in the bone

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5
Q

What extends backwards to give rise to the permanent 1st, 2nd, and 3rd?

A

Dental lamina

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6
Q

T/F - Preeruptive tooth movement causes crowding.

A

TRUE

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7
Q

T/F - Permanent teeth shift to an apical position in relation to primary teeth.

A

TRUE

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8
Q

The maxillary molars have their occlusal surfaces arrive somewhat ______, while the mandibular molars have a ________ inclination.

A

Distally

Mesial

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9
Q

Movements of the tooth germ are accomplished by either what 2 things?

A

Whole tooth germs moving (or being moved) or by directional growth (like an enamel knot)

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10
Q

T/F - Basically, pre-eruptive movements position the tooth for eruption and occur as the tooth germ develops.

A

TRUE

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11
Q

What happens when a tooth’s oppositional counterpart is not there?

A

Supereruption

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12
Q

T/F - The actual eruption of the tooth into the mouth is only the final stage, a lot has already occurred to align the tooth properly.

A

TRUE

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13
Q

How do primary teeth erupt?

A

Fusion of the oral epithelium w/ the reduced enamel epithelium, creating an epithelium lined channel thru which the tooth emerges

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14
Q

What is the gubernacular canal?

A

Channel that develops b/t the alveolar bone around the primary tooth and the perm tooth as it erupts

*This forms along with the remnants of the dental lamina attached to the lamina propria (Also called the gubernacular cord)

**A canal that opens up lingually to primary teeth where the perm tooth will emerge

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15
Q

What drives tooth eruption? 4 theories

A

-Bone remodeling theory
—Bone deposits under an erupting tooth propelling it outwards
—-Removal of dental follicle = no bone = no remodeling and thus no eruption (NO TOOTH!)
—-Replica teeth placed in an intact follicle still form an eruption pathway

-Root growth theory
—Root formation pushes the tooth outwards
—-Pushing against what?
—-Not enough root to account for the movement to occlusal plane
—-If you cut off the roots, a tooth still erupts

-Vascular pressure theory
—Blood vessels at the tooth apex push it outwards via hydrostatic pressure
—-No way is this pressure sufficient
—-Remove vascular supply, teeth still erupt

-Cushion hammock theory
—Ligament under the tooth pushes it out
—-This ligament probably doesn’t exist

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16
Q

Intraosseously, a perm tooth progresses at 1-10 microns/day, but once in the gubernacular canal, what is the rate?

A

Up to 75 microns/day

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17
Q

What is the current idea behind tooth eruption?

A

The PDL, developing after root formation, is the driving force

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18
Q

How does the PDL erupt a tooth?

A

Fibroblasts pull against each other and collagen bundles->This exerts pressure on the tooth

BUT rootless teeth erupt and teeth with PDLs can fail

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19
Q

Why is the dental follicle critical for tooth eruption?

A

It initiates bone resorption and the breakdown of soft tissues

The REE players a similar role, and may also signal the dental follicle of when the tooth is “ready”

20
Q

What are key mediators for eruption, specifically tissue resorption? 4 of them

Also, what tissues are resorbed?

A

Colony Stim Factor-1

IL-6

IL-1alpha

Monocyte Chemotactic Protein-1

-Bone, CT, Epi

21
Q

What are key mediators for eruption, specifically tissue formation? 5 of them

What tissues do these affect?

A

BMP-2

BMP-6

Runx2

TGFbeta

EGF

-Bone, PDL, root formation

22
Q

Why is there post-eruptive tooth movement? 3 reasons

A

To accommodate the growing jaws

To compensate for occlusal wear

To compensate for interproximal wear

*Generally bone remodeling compensates for increased height

23
Q

Tension is what?

A

Remodeling of PDL fibers and bone deposition

24
Q

T/F - Inflammation typically means bone resorption.

A

TRUE

*PERIO

25
Q

What is compression?

A

Remodeling of PDL fibers and bone resorption

26
Q

What is hyalinization?

A

Damage to cells in the PDL

—Loss of cells = no remodeling

27
Q

T/F - Pulp can be damaged if tweaked too hard, and at the access of the tooth, the vascular supply can be interrupted

A

TRUE

28
Q

What most likely helps keep the tooth in occlusion to compensate for occlusal wear?

A

PDL

Deposition of cementum/alveolar bone may help keep the tooth in its adjusted position

29
Q

Which way do teeth drift, mesial or distal, to compensate for interproximal wear?

A

MESIAL

30
Q

Which fibers of the PDL are important in ensuring relative tooth movement?

A

Transseptal ligament fibers

*Bone/PDL remodeling will help keep them in the new orientation

31
Q

What is shedding?

A

Primary (Deciduous) teeth fall out

32
Q

Incisors/canines are preceded by what?

A

Resorption of deciduous roots on the lingual surface

33
Q

What are the hard tissues resorbed by?

A

ODONTOCLASTS

*Basically, these are osteoclasts

34
Q

PDL ________ cell death clearly contributes to soft tissue resorption.

A

Fibroblast

35
Q

Interproximal wear is a force to which way?

A

Apical

36
Q

Anterior force from bite is in what direction?

A

Anteriorly

37
Q

T/F - Pressure from the advancing perm tooth can speed the resorption of primary teeth. HOWEVER, a primary tooth w/o a perm tooth under it will still shed, but later on

A

TRUE

38
Q

Primary molars are pushed to shed by what two things?

A

Interradicular dentin and root resorption

39
Q

T/F - Stimulation for shedding is probably a combo of factors: Pressure from erupting teeth cause resorption, leading to decreased mechanical stability, which in turn leads to further resorption of the tooth.

A

SO DANG TRUE

40
Q

ODONTOCLASTS = ??

A

OSTEOCLASTS

41
Q

What breakdown collagen and soft tissues and resin composites?

A

MMP

42
Q

KNOW THE SEQUENCE OF SHEDDING/ERUPTION

A

NXI

MAIN

? FIND ANOTHER VIDEO/RESOURCE

43
Q

One of his favorite questions is: What is the erupted dentition of a normally developed 7-year-old child usually consists of how many permanent vs primary teeth.

A

So learn eruption

44
Q

Another theory of resorption of dental tissues is what?

A

Primary dentition not capable of “hanging” with forces of a mature jaw

This leads to root resorption and shedding

45
Q

T/F - Shedding is pretty much L/R symmetrical.

A

TRUE

Oral Biology - Quiz 3 (7 decks)

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