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SP15 Partial Dentures > Clinical Management > Flashcards

Clinical Management Flashcards

1
Q

What are the five clinic requirements

A 
signed treatment plan (blue)
phase 2 completed treatment form
complex treatment (green sheet)
surveyed diagnostic cast
custom tray if necessary
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2
Q

Addition silicone and polyether remained accurate after how much time (and can be poured repeatedly)

A

1 week

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3
Q

What are the two major requirements of a framework impression

A

records the anatomic form on the teeth

records the moving tissues that will border the denture in an unstrained position

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4
Q

What could result if there is under extension of the impression

A

food impaction

inadequate contours

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5
Q

What could result if there is over extension of the impression

A

sore spots

over contoured or overextended areas

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6
Q

What are two major requirements of impression materials

A

must record tooth and tissue detail accurately

can be withdrawn from tooth and tissue undercuts without permanent deformation

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7
Q

What are the primary stress bearing areas of the maxillary arch

A

posterior alveolar ridges

hard palate

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8
Q

What is the secondary stress bearing area of the maxillary arch

A

anterior alveolar ridges

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9
Q

What are the primary stress bearing areas of the mandibular arch

A

buccal shelf

retromolar pad

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10
Q

What is the secondary stress bearing area of the mandibular arch

A

alveolar ridge

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11
Q

What are the four indications for a stock tray with alginate

A

Kennedy III (tooth supported)
mandibular kennedy I or II
when a secondary impression will be used and the alveolar ridges exhibit adequate support

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12
Q

The altered cast impression is dependent on what for a portion of its support

A

residual ridge

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13
Q

How does an altered cast impression obtain retention

A

from its base aided by indirect retention to precent the dentures lifting away from the residual ridge

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14
Q

What are three indications for a custom tray

A 
kennedy class I or II mandibular arch with severe ridge resorption
all maxillary kennedy class I or II RPDs
when modification to a stock tray is not possible
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15
Q

This occurs during the setting of elastomeric materials which is proportional to the thickness of the material

A

dimensional changes

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16
Q

Dimensiontal changes are minimized when the thickness was a consistent what

A

2-3mm

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17
Q

These two things directly relate to the distortion of the impression

A

thickness of the impression

size of the undercut

18
Q

Which causes greater distortion, increased thickness in the impression or increased size of the undercut

A

increased thickness

19
Q

What are the measurements of custom tray fabrication

A

1-1.5mm short of the vestibule
2mm wax spacer over teeth
1mm wax spacer of edentulous areas

20
Q

What are two advantages of irreversible hydrocolloid (alginate)

A

cost

simplicity

21
Q

What are two disadvantages of alginate

A

must be poured within 15 minutes

border control is difficult

22
Q

Which areas of the maxillary arch are typically modified

A

palate
posterior border
tuberosity

23
Q

Which areas of the mandible are typically modified

A

lingual flange

retromolar pad

24
Q

Why would you modify a stock tray

A

alginate is more accurate at a thickness of approximately 5mm
in an area such as a deep palatal vault or edentulous area there will be more than 5mm of space for alginate

25
Q

What are five precautions involving irreversible hydrocolloid

A

impression must be held immobile during gelation
remove impression from mouth quickly in long axis of teeth
impressions should not be immersed in water
impressions should be protected from dehydration
impression must be poured within 15 minutes

26
Q

What are three precautions of using alginate in terms of pouring casts

A

measuring the powder and liquid
vacuum spatulation
use type IV dental stone (pink stone)

27
Q

This has better border control than alginate in an adequate supporting tray

A

polysulfide

28
Q

What are some advantages of polysulfide

A

low cost
flexible
high tear resistance
long working time

29
Q

polysulfide has the highest what of elastomeric materials

A

flow

30
Q

What are four disadvantages of polysulfide

A

messy
must be poured within one hour
longer setting time = more chair time
custom tray recommended

31
Q

What are four advantages of polyvinyl

A

automixing cartridges
dimensional stability
highly accurate
shorter setting time than polysulfide

32
Q

What property is polyvinyl excellent at

A

recovery from deformation on removal

33
Q

What are four disadvantages of polyvinyl

A

cost
increased rigidity
lower tear strength
custom tray recommended

34
Q

What is it that about the increased rigidity of polyvinyl that makes it hard to work with

A

does not flow well
more difficult to remove from undercuts
more difficult to separate casts

35
Q

What are five advantages of polyether

A 
short setting time
highly accurate
dimensionally stable
hydrophobic
automix cartridges available
36
Q

What are six disadvantages of polyether

A 
low flexibility
extremely rigid
low flow
cost
low tear strength
custom tray recommended
has limited use in RPDs
37
Q

What is the most flexible impression material, which would work well with tall teeth and big embrasure spaces

A

polysulfide > polyvinyl > polyether

38
Q

What impression material has the best elastic recovery from deformation

A

polyvinyl > polyether > polysulfide

39
Q

It is important to block out the pontic area of FPDs with wax for which impression materials

A

polyvinyl and especially polyether

40
Q

What are five possible causes on an inaccurate cast

A 
inaccurate water:powder ratio
improper mixing of stone
trapping of air
separation of cast too soon
failure to separate the cast for an extended period of time
41
Q

What are some things regarding the economics of choosing an impression material

A

alginate is stupid cheap - 30 cents/impression

while the others range from $60-$10/impression

42
Q

What could be used to increase the patients tolerance of an impression material

A

topical anesthetic

SP15 Partial Dentures (6 decks)

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