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23 Fixed Prosth > 6/2 - #19 Direct Jet Provisional, Adding Jet to Jet, 241-255, 256-259 > Flashcards

6/2 - #19 Direct Jet Provisional, Adding Jet to Jet, 241-255, 256-259 Flashcards

1
Q

provisionals are also called what

A

temporaries

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2
Q

what resins are used for provisional restorations

A
  1. polymethyl methacrylate (PMMA)
  2. polyethyl methacrylate (PEMA)
  3. polyvinylmethyl metharcylate (PVEMA)
  4. bis-acryl composite
  5. VLC urethane dimethacrylate
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3
Q

advantages of PMMA

A
  • good fit
  • good strength
  • good polishability
  • durability
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4
Q

advantages of PEMA

A
  • good polishability
  • minimal exothermic heat increase
  • good stain resistance
  • low shrinkage
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5
Q

advantages of PVEMA

A
  • good polishability
  • low exothermic heat increase
  • good abrasion resistance
  • good stain resistance
  • flexibility
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6
Q

advantages of bis-acryl composite

A
  • good marginal fit
  • low exothermic heat increase
  • good strength
  • low shrinkage
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7
Q

advantages of VLC urethane dimethacrylate

A
  • high surface hardness
  • good strength
  • good abrasion resistance
  • controllable working time
  • color stability
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8
Q

disadvantages of PMMA

A
  • high exothermic heat increase
  • low abrasion resistance
  • free monomer toxic to pulp
  • high volumetric shrinkage
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9
Q

disadvantages of PEMA

A
  • surface hardness
  • strength
  • durability
  • fracture toughness
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10
Q

disadvantages of PVEMA

A
  • surface hardness
  • strength
  • esthetics
  • fracture toughness
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11
Q

disadvantages of bis-acryl composite

A
  • surface hardness
  • less stain resistance
  • limited shade selection
  • limited polishability
  • brittle
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12
Q

disadvantages of VLC urethane dimethacrylate

A
  • marginal fit
  • less stain resistance
  • limited shade selection
  • expensive
  • brittle
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13
Q

examples of PMMA products? what is the most used?

A

Jet (most used)
Alike
Trim Plus

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14
Q

examples of PEMA

A

Snap

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15
Q

examples of PVEMA

A

Trim

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16
Q

what causes PVEMA to be more flexible

A

due to the vinyl present

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17
Q

examples of bis-acryl composite/bis-GMA composite

A

Luxatemp
Integrity

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18
Q

examples of VLC dimethacrylate

A

Triad

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19
Q

which resin features a high exothermic increase

A

PMMA

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20
Q

which resin is brittle

A

bis acryl and VLC urethane dimethacrylate

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21
Q

when making a provisional, do you place vaseline on both the manikin and live patients?

A

NO! only on manikin, but not on live patient

22
Q

when combining the liquid monomer and powder, when will you place it into the matrix then into mouth?

A

when it is no longer sticky or glossy

23
Q

how long does Jet take to set in typodont mouth? patient mouth?

A

manikin: 1:30-2:00 min
live patient: 1:00 min

basically just wit until it is hard and rubbery in dappen dish then can remove. don’t remove too early or too late

24
Q

what should you do to the provisional to increase the speed of set

A

place in hot water bath

25
Q

what handpiece and bur and rpm to use to clean provisional

A

straight handpiece

acrylic bur or use clean round rubber wheel at 6,000 rpm (can polish and take material off)

26
Q

do you make the provisional first or the impression first?

A

PROVISIONAL FIRST!

27
Q

should the shimstock hold with the provisional in but not when it’s out?

A

NO! should hold BOTH with and without the provisional in

28
Q

should you remove centric or eccentric interferences?

A

remove ECCENTRIC (left, right, back forward)

keep centric (tap, tap)

29
Q

can you add Jet to Jet

A

YES

just add liquid monomer to the area of the tooth you want to add to first

30
Q

can you polish the provisional with wet pumice

A

YES. just stay away from margins

31
Q

during the time between the preparation of the tooth and the placement of the definitive restoration, the tooth is protected by what?

A

provisional restoration

32
Q

good provisional restoration should satisfy which requirements

A
  1. pulpal protection
  2. positional stability
  3. occlusal function
  4. ease of cleaning
  5. nonimpinging margins
  6. strength and retention
  7. esthetics
33
Q

the restoration must be fabricated of a material that will prevent conduction of temperature extreme. The margin should be adapted well enough to prevent leakage of saliva

A

pulpal protection

34
Q

the tooth should not be allowed to extrude or drift in any way. any movement will require adjustments of remake of definitive restoration at time of cementation

A

positional stability

35
Q

being able function occlusally with provisional restoration will aid pt comfort, ward off tooth migration, and possibly prevent joint or neuromusclar imbalance

A

occlusal function

36
Q

the restoration must be made of material and contour that will permit patient to keep it clean during time it is worn. if gingival tissues remain healthy while provisional crown is in place, there is less likelihood of a problem arising during cementation of definitive

A

ease of cleaning

37
Q

the lack of ___ can result in inflammation, gingival proliferation, recession, or hemorrhage during the impression or cementation

A

nonimpinging margins

38
Q

types of provisional restorations

A
  1. prefabricated vs. custom restorations
  2. direct vs. indirect techniques
39
Q

examples of prefabricated provisionals

A
  1. stock aluminum cylinders
  2. anatomical metal crown forms
  3. clear celluloid cells
  4. tooth colored polycarbonate crown forms
40
Q

what type of provisional restoration can be used only for single-tooth restorations

A

prefabricated provisionals

41
Q

___ and ___ can be fabricated of several different kinds of resins by a variety of methods, direct or indirect

A

custom crowns; FPD

42
Q

direct vs. indirect technique

A

direct: on the actual prepared teeth in the mouth
indirect: outside of the mouth on a cast made of quick-set plaster

43
Q

which provisional technique is technique sensitive?

A

direct

44
Q

which provisional technique is preferred for its accuracy since it doesnt have to be removed from tooth before it completely polymerizes

A

indirect

45
Q

pure methyl methacrylate has a ___% volumetric shrinkage when it polymerizes

A

21%

46
Q

a study showed that the marginal fit of PMMA provisional restoration could be improved by ___% by fabricating them indirectly

A

70%

47
Q

which provisional technique is preferred for the protection that it provides to the pulp

A

indirect

48
Q

what is the most superior resin?

A

no one resin is superior in all respects

49
Q

which impression provides excellent stability

A

elastomeric

50
Q

techniques for custom provisional restorations

A
  1. overimpression-fabricated provisional crown
  2. template fabricated provisional FPD
  3. template fabricated VLC provisional restoration
  4. shell-fabricated provisional restoration
  5. overimpression-fabricated bis-acryl composite crown

23 Fixed Prosth (21 decks)

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