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Fixed Prosth 1 > Interim Restorations > Flashcards

Interim Restorations Flashcards

1
Q

What are the 6 uses of interim restorations?

A 
ØEsthetics
ØFunction 
ØPrevent Sensitivity
ØDrifting 
ØTissue Health
ØDiagnostics
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2
Q
  • A prosthesis designed to enhance esthetics, stabilization and/or function for a limited period of time after which it is to be replaced by a definitive prosthesis.
  • Used to assist in determination of the therapeutic effectiveness of a specific treatment plan or the form and function of the planned definitive prosthesis.
  • Essential to Fixed Prosthodontic treatment since restorations are fabricated indirectly in the laboratory.
A

Interim restoration

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3
Q

What are the 7 biomechanical requirements of interim restorations?

A
  • Pulpal protection
  • Positional stability
  • Occlusal function
  • Cleansability
  • Marginal integrity
  • Strength and retention
  • Esthetics / Phonetics
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4
Q

T/F: A provisional will prevent lateral drifting of the prepared and/or adjacent teeth

A

True

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5
Q

Do you want a convex or concave emergence profile on the margin of interim restorations?

A

Concave

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6
Q

While in a ______ state, the mixed resin fills the cavity formed by a mold, and then solidifies producing a rigid restoration.

A

fluid

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7
Q

ØCustom direct interim crown is removed from the matrix, and then shaped and polished.

A

Direct Technique

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8
Q

_____ mold: one part forms external contour of crown or FPD; the other forms the internal or tooth / tissue-contacting surface.

A

•Two-part mold

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9
Q 
\_\_\_\_\_\_ form
•Pre-fabricated (preformed) crowns
•Single crowns only
•Custom-fabricated molds
•Single or multiple unit restorations
A

External surface form

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10
Q 
\_\_\_\_\_\_ crown forms
•Aluminum or tin-silver
•Nickel-chrome or stainless steel
•Polycarbonate shells
•Cellulose acetate shells
•VLC moldable composite crowns
A

ØPrefabricated crown forms

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11
Q

_______ Crown Forms

1) Limited to single units
2) Must be lined with auto polymerizing resin
3) Considerable modification (internal relief, axial recontouring, occlusal adjustment) may be required
4) Can manipulate resin to prevent “locking in”
5) First-visit emergency when crown is missing.

A

Pre-fabricated crown forms

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12
Q

_____ molded crown

1) Less time consuming
2) Must be used for multiple units (FPD)
3) Improved contours and esthetics
4) Simulates planned restoration (when used in combination with diagnostic waxing).

A

Custom molded crown

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13
Q

______ technique
•Made intra-orally directly on patient
1)Convenience
2)Time required for fabrication –routine restorations

A

Direct Technique

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14
Q

______ technique
•Made in laboratory on a cast of the prepared teeth
1)Patient comfort / allergies
2)Presence of multiple undercuts
3)Long span FPD or multiple units
4)Indirect Provisionals can be fabricated in advance of the tooth preparation appointment; use of auxiliaries

A

Indirect Technique

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15
Q

______ crown :
•Vacuum-formed matrix
•Silicone putty matrix
•Alginate or VPS impression

A

Custom molded crown

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16
Q

____ polish:wetpumice / muslin wheel; dry tin oxide (Acrilustre) on muslin wheel

A

PMMA

17
Q

______ polish: rubber abrasives, polishing paste, or unfilled resin glaze

A

Bis-acryl resin

18
Q

The following are Desirable Properties and Characteristics of ________ for Interim Restorations

1) Convenient handling
2) Biocompatibility
3) Dimensional stability during polymerization
4) Ease of contouring and polishing
5) Flexural strength and abrasion resistance
6) Appearance (translucence; color; color stability)
7) Patient acceptance
8) Chemical compatibility with luting agents

A

Polymer Resins

19
Q

:1)Poly(methyl methacrylate) (PMMA)

2) Poly(R’ methacrylates) (R’ = ethyl, vinyl, isobutyl)
3) Powder / Liquid (chemically activated; “cold cure”)

A

ØAcrylic Resins

20
Q

1) Multifunctional dimethacrylate composite resins
i. Bis-GMA / Bis-EMA / Urethane dimethacrylate
2) Chemically-Activated
3) Dual-Activated (chemical / VL)
4) Visible Light-Activated

A

ØBis-Acryl Composite Resins:

21
Q

ØThe chemical conversion of monomer to a biologically inert polymer by chain reaction.
ØUnreacted free monomer is toxic(esp. MMA)
ØInadequate polymerization results in poor mechanical properties.
ØPolymerization reaction is exothermic, and there is shrinkage upon polymerization and cooling.

A

Free radical polymerization

22
Q
  • ________: formation of a free radical by decomposition of an initiator(due to “activator ”)
  • Benzoyl peroxide + 3o amine / heat (MMA)
  • Camphoroquinone+ blue light-490nm (VLC composite)
A

Activation

23
Q

•Process of adding molecules in growing chain

A

Propagation(growth)

24
Q
  • Growing chains randomly combine; stop growing

* Polymerization is completed

A

Termination

25
Q

:process of adding molecules in the growing chain
•Physical properties of rigidity and strength develop
•Setting material ↑density and exothermia, causing polymerization contraction.
•↑ Temperature during propagation promotes:
•greater polymerization and
•removal of unconverted monomer
•Composites: additional VLC ↑ polymerization, strength

A

Propagation

26
Q
  • Growing chains randomly combine
  • Material becomes rigid –able to finish / polish (≈5 minutes)
  • Desirable to convert all free monomer to polymer before termination
  • (Does not COMPLETELY happen)
  • Composites: additional VLC ↑ polymerization, strength
A

Termination

27
Q

Properties associated with _______:
•Chemical / allergic irritation
•Physical properties of set material
•Exothermic heat of reaction& volumetric shrinkage
•Strength of mass
•As MW (size) of monomer ↑(ethyl, isobutyl, etc.), exothermia, shrinkage, and strength ↓
•Composites: UDMA can affect resilience, toughness to counteract brittleness

A

MONOMER

28
Q

Properties associated with ______ (Powder):
•Increase in filler content→
•Greater strength
•Less exothermia and less shrinkage
•Too much filler → poor handling
•Composites: size / shape of particles affects density, strength, surface finish

A

POLYMER

29
Q 
ØADVANTAGES
•Good marginal fit
•Good transverse strength
•Polishes well
•Durability / color stability
ØDISADVANTAGES
•Toxic monomer
•High exothermia
•High volumetric shrinkage(8%)
•Low abrasion resistance
A

PMMA

30
Q

can generate temperatures of 70 oC or higher in the pulp chamber as material goes through polymerization.
•Free monomer contact with tissues → chemical burns, allergic reactions.
•Monomer vapor is harmful.
A volumetric shrinkage of ~8%occurs on polymerization.
•A 2% reduction in crown diameter results in a high marginal discrepancy.
•Results when polymerization occurs off the tooth.

A

PMMA

31
Q 
ADVANTAGES
•Less exothermia
•Less shrinkage
ØDISADVANTAGES
•Toxic monomer
•Poor:•Surface hardness
•Transverse strength
•Durability
•Fracture toughness
•Color stability
A

Poly(R’methacrylate)

32
Q 
ØADVANTAGES
•Good marginal fit
•Low exothermia
•Low shrinkage
•Good surface hardness and abrasion resistance
•Good biocompatibility, color stability, and patient acceptance
ØDISADVANTAGES
•Limited polishability
•Improved surface finish w/ resin glaze
•No doughy/rubbery stage
•↑ Cost•Brittleness
A

Bis-Acryl Resins

33
Q
  • Time required for fabrication
  • Time the interim is required to function in the mouth•Materials available for fabrication
  • Management of deficiencies•Reline / modification / repair
  • Treatment of the fractured or defective surfaces
  • Grinding to expose fresh surfaces; removing enough to provide adequate thickness and ability to complete re-seating of restoration
  • Roughening / sandblasting / bonding agent
  • Composite –flowable composite resin
A

Bis-Acryl Resins

34
Q

______ cements (Temp Bond)•Low strength•Sedative (obtundant) and bactericidal•Inhibition of resin polymerization

A

Zinc Oxide –Eugenol

35
Q

_____ cement w/ plasticizers (Ultratemp)

•Low strength final cement

A

Polycarboxylate

36
Q

cement –modified (Smart Temp)

•Longer-term use

A

Glass ionomer-based

37
Q

______(modified low strength) (Te l i oCS Link)
•Especially helpful for planned bonded-ceramic restorations
•Translucent

A

Resin Cement

38
Q

•Equal amounts of base and catalyst are mixed together on a mixing pad.•The material is mixed with a small spatula until homogenous.•Mixing Syringe is also available

A

Provisional cementation

Fixed Prosth 1 (12 decks)

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