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Oral Biology > Tooth Movements > Flashcards

Tooth Movements Flashcards

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1
Q

why are some examples of tooth movements

A

functional tooth movements
mesial drift
orthodontic tooth movements

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2
Q

what are the occlusal forces

A

greater between molars
70-150N dentate
4-55N edentulous

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3
Q

what are the max clenching forces between molars

A

500-700N

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4
Q

what plane has greater movement

A 
greater movement in horizontal plane (100Um) 
lesser vertical (10Um)
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5
Q

what are some tooth support components

A

bone
PDL fibres
PDL fluids

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6
Q

what is the system that response in tooth movement to load

A

visco-elastic system

- not purely elastic there is a viscous property due to PDL fluids

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7
Q

what are some factors affecting tooth movement

A

slow rate load - greater move
anger tooth load- slower rate
tooth not loaded- less mobile
more tooth loaded - tooth displaced less mobile

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8
Q

what is the implication of response to repeated application of a 5N loa

A

occlusal accuracy of precision impressions

indirect restorations

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9
Q

what si the viscous element of disco elastic support of tooth

A

ECM - aggregates at rest less mobility

PDL fluids - interstitial and blood

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10
Q

what is the elastic element of the visco elastic tooth support

A

collagen
bone
osseointgrated implants
- pure elastic

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11
Q

how is an osseoimpant supported

A

no pDL
elastic suppor form bone
much less movement

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12
Q

what are the support of normal tooth

A

PDL bone

viscoelastic support

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13
Q

what are the similarities of PDL to tension bearing CT

A

oblique fibres
sharpens fibres
fibroblast shape and orientation
GAGs

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14
Q

what are the differences of PDl to tension bearing CT

A

small diameter of collagen fibres
scarcity of sharply fibres in lamina dura
quantities of ground substance

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15
Q

what are post eruptive tooth movements

A

vertical
buccal
mesial
othrodontic

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16
Q

what is th buccal posts eruptive movement

A

growth of jaws

bone remodelling

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17
Q

what is the vertical post eruptive movements

A

continued eruption
compensation of wear
bone depo
cementum depo

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18
Q

when does mesial drift occur

A

thourghout life

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19
Q

what is media drift

A

drift i metal director towards arch midline

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20
Q

what si the result of mesial drift

A 
compensates approximal wear 
incised crowding 
shorten dental arch 
orthodontic relapse 
space closure follow tooth loss
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21
Q

how much is an example of 6-18 years of missal drift

A

3-4mm

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22
Q

what is am example of effect of a hard diet on mesial draft

A

move of 7mm

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23
Q

what si the extrinsic mech to peridontium for mesial drift

A

occlusal forces
muscular soft tissue forces
erupting molars

24
Q

what is the intrinsic mech to periodontium for mesial drift

A

bone remodelling

PDL Fibres - transeptal Fibrs

25
Q

are occlulsa loads the same

A

no transient

26
Q

approximal tooth wear must have

A

fore pushing teeth together

27
Q

what is the effect of no opposing teeth on mesial drift

A

still drift
faster rate
no occlusal interlocking

28
Q

what is the effect of flattened cusps on mesial drift

A

faster rate

no occlusal interlocking

29
Q

what does reshaping cusps do on mensal drift

A

side favour drift faster

side oppose drift
slower

30
Q

what does a 9Kg load occlusal result in a horizontal load

A

2.25kg against molars

5kg against kilograms

31
Q

when clench occusally what is produced

A

anterior vector to closing force

32
Q

do occlusal forces effect mesial drift

A

partly involved

but not most important factor

33
Q

what are the effects of the soft tissues

A

(cheeks + buccinator)

not likely to play a role

34
Q

what is the evidence of the forces from erupting molars

A

extraction of premolars

spaces more rapidly when molars erupt

35
Q

what is the evidence against forces rom erupting molars

A

mesial drift occurs through life - after molars erupted
still get mesial drift
anterior to any ankylosed tooth

36
Q

what sit he evidence of bone remodelling with mesial drift

A

happens sometime as mesial drift

37
Q

what si the evdicen against bone remodelling

A

marker experiments show that bone fills in

effect not cause

38
Q

what do transeptal fibres do

A

maintain tooth contact
stabilise tooth position
less orthodontic relapse if cut

39
Q

what sit he picots and moss

A

process elimination
PDL involved
cut transeptal fibres
mesial drift slowed

40
Q

what is mesial drift therefore dept on

A

multifactorial

  • greatest PDL transeptal fibres
  • occlusal factor
  • not erupting molars
41
Q

what are some factors inleucneing position teeth in the arch

A 
eruption position
jaw growth 
guidance adjacent or opposing teeth 
mesial drift
soft tissue forces
sucking thumb suck
42
Q

what are th basics of orthodontic tooth movements

A

small continual forces
- bone remodel
PDL remodel
- tooth move

43
Q

what are the 3t types of orthodontic tooth movement

A

tipping
bodily
rotational

44
Q

what is tipping movement

A

tension and compression

movements and hence forces greater the further away form he fulcrum

45
Q

what is bodily move

A

compression going into mouth form tension at the front aspect
force on crown

46
Q

how much force used orthodontically

A

ideally close to natural forces

less than PDL capillary pressure

47
Q

what happens if force > PDL cap pressure

A

ischaemia

48
Q

wha tis the force of

  • tipping
  • bodily
  • rotational
  • extrusion
  • intrusion
A 
30-60g
60-120g
30-60g
30-60g
10-20g
49
Q

what do light fires do

A 
compression = frontal resorption (osteoclasts) 
tension = deposition from osteoblasts
50
Q

what do heavy forces do

A

hyalinisation

tension - depo - osteoblasts

51
Q

what is hyalinisation

A

compression ++ exceed cap pressure = sterile necrosis/cell death/translucent appearance = undermining endosteal resorption

52
Q

what are some possible effects of excessive forces

A 
pain 
- ischaemia 
- inflam - necrosis 
unprepared hyalinisation
pulp death- strangle vessels at apex
root resorption - odontoclast
53
Q

what are the means of stability and retention

A

remodel bone
remodel principal collagen fibres
need for retention

54
Q

what needs retention

A

long term permanent
large space closure
correction of severe rotations

55
Q

what are the ways of remodelling of principle collagen fibres

A 
rapid below alveolar crest 
lower above alveolar crest 
- supralaveolar
esp transeptal
rotations

Oral Biology (23 decks)

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