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Prosthesis > retention and stability > Flashcards

retention and stability Flashcards

1
Q

What is retention?

A

resistance to tissue-away forces

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2
Q

What re the physical factors that affect retention of denture?

A
  • adhesion
  • cohesion
  • interfacial surface tension (similar to cohesion)
  • atmospheric pressure (peripheral seal)
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3
Q

What is adhesion?

A

physical attraction of unlike molecules to each other

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4
Q

What are examples of adhesion?

A
  • saliva to mucosa
  • saliva to denture
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5
Q

What is cohesion?

A

physical attraction of like molecules for each other

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6
Q

What is an example of cohesion?

A

saliva

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7
Q

Is cohesion and adhesion related?

A

yes

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8
Q

What forces does peripheral seal resist?

A

vertical and lateral forces

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9
Q

What forces does adhesion resist?

A

lateral forces

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10
Q

What forces does cohesion resist?

A

lateral forces

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11
Q

What forces does interfacial surface tension resist?

A

lateral forces

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12
Q

What are the intra-oral factors and biomechanical considerations of denture retention?

A
  • arch size
  • disharmony of jaw sizes
  • arch form
  • ridge form
  • vault form
  • soft palate
  • undercuts on basal seat
  • interarch distance
  • polished surface of denture
  • gravity
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13
Q

What is the recommended arch size for retention of denture?

A

large arch size

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14
Q

What is the recommended harmony of arch size for retention of denture?

A

angle class 1

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15
Q

What is the recommended arch form for retention of denture?

A

square

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16
Q

What is the least favorable prognosis for arch form for retention?

A

tapered

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17
Q

What does a flat vault resist?

A

vertical displacement but it
provides little resistance to lateral displacement (retention is good)

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18
Q

What does a V-shaped vault resist?

A
  • unfavorable for the retention of dentures
  • provides no adaptation –> decrease adhesion and cohesion –> decrease retention –> increase resistance to lateral forces (good stability)
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19
Q

What is the most recommended vault form for retention and stability?

A

u-shaped as it resists both vertical and lateral dislodging forces and goo adaptation

20
Q

What is the most favorable retention form of soft palate?

A

class I soft palate has a gentle curvature and demonstrates little muscular movement, hence it is the most favorable

21
Q

Are undercuts good for retention?

A
  • no, it needs to be open flanges
  • if only one undercut present, it increases retention (undercut is in path of removal and insertion)
22
Q

What are the uses of flexible resins?

A
  • undercuts
  • v-shaped palate (increased adaptation)
  • sharp mylohyoid ridge
23
Q

What is the normal interarch distance?

A

2-3mm

24
Q

What is the interarch distance?

A

distance between maxilla and mandible (teeth and freeeway space) where denture is placed

25
Q

What is the interarch distance recommended for better retention and stability?

A

2-3mm (small interarch distance)

26
Q

What happens if the interarch distance is more than 2-3mm?

A
  • longer teeth are used
  • lateral forces increase (alters stability and retention)
27
Q

What should the shape of polished surface be to be retentive?

A

concave (more muscle adaptation and stability)

28
Q

What should the shape of lingual surface be?

A

covex then concave to avoid formation of undercuts

29
Q

Does gravity aid upper denture?

A

no

30
Q

Does gravity aid lower denture?

A

yes

31
Q

What is stability?

A

resistance to rocking or lateral forces

32
Q

What is the most retentive shape for ridge form?

A

ideal form is a high ridge with flat crest and parallel or nearly parallel sides (square ridge)

33
Q

What ridge form provides most stability?

A

square

34
Q

What is the best arch form for better stability?

A

square

35
Q

What happens if mucosa is very low (hard bony areas)?

A

rocking and instability and pain

36
Q

What is the faorable prognosis for better stability for mucosa supporting prosthesis?

A

2-3mm

37
Q

What happens if the mucosa supporting denture is mpre than 10mm (flabby ridge)?

A
  • rocking and instability
  • selective pressure impression technique
38
Q

What is the arrangement of teeth buccolingually?

A

on crest of the ridge to avoid cramped tongue

39
Q

What happens if teeth are arranged lingual to the crest of the ridge?

A

cramped tongue

40
Q

What happens if teth are arrangedbuccal to the crest of the ridge?

A
  • cheek biting
  • rocking
  • instability
41
Q

What is the arrangement of teeth occlusogingivally?

A

below lateral borders of the tongue to allow lower denture stability

42
Q

What is the arrangement of teeth antro-posteriorly?

A
  • away from retromolar pad (posterior) to avoid inclination of teeth (which might increase lateral forces leading to instabiliy)
43
Q

Does arrangement of teeth alter stability?

A

yes

44
Q

What should be done to flabby and bony ridges?

A

relieved

45
Q

What should the occlusion be for better stability?

A

even occlusion

Prosthesis (7 decks)

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