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Fixed Prosthodontics I > Provisional Restorations > Flashcards

Provisional Restorations Flashcards

1
Q

A prosthesis designed to enhance esthetics, stabilizations and/or function for a limited period of time after which it is to be replaced by a definitive prosthesis:

A

Provisional

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2
Q

A provisional is used to assist in the determination of the _____ of a specific treatment plan or the form and function of the planned definitive prosthesis.

A

Therapeutic effectiveness

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3
Q

What allows for patients to not need a provisional, as the patient leaves the office with the definitive cemented restoration?

A

Digital dentistry

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4
Q

Functions of provisional restorations include: (6)

A
  1. Prevent sensitivity
  2. Prevent drifting
  3. Allow tissues to heal
  4. Return function to dentition
  5. Esthetics
  6. Diagnostic evaluations
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5
Q

Requirements of a provisional include: (7)

A
  1. Pulpal protection
  2. Provisional stability
  3. Occlusal function
  4. Ability to clean
  5. Marginal integrity
  6. Strength and retention
  7. Esthetic and phonetics
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6
Q

What do provisional restorations protect against? (3)

A
  1. plaque and saliva
  2. irritating and painful stimuli (temp changes, chemicals & fluids)
  3. abrasion and breakage for prepared tooth
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7
Q

Provisional restoration positional stability requires: (3)

A
  1. proximal contacts
  2. occlusal contacts
  3. interabutment stability in a bridge
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8
Q

The proximal contacts of a provisional restoration prevent:

A

lateral drifting of the prepared and/or adjacent teeth

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9
Q

What should expect when a patient comes to a crown seat appointment and tells you the temporary fell off about a week and a half ago?

A

Expect that adjustments will be needed to counter the tooth movements that likely occured

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10
Q

When your provisional lacks ____, this can result in extrusion (collapse of the vertical space between prep and opposing teeth)

A

occlusal contacts

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11
Q

What would cause your definitive crown to seat high resulting in the need for more adjustments then desired?

A

Extrusion used by lack of occlusal contacts in provisional

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12
Q

Your patients comes in, and since the provisional you gave them lacked occlusal contacts, the definitive crown sat high and needed lots of adjustment. What is at risk here?

A

Material thinning, or destruction of anatomy compromising the function of the crown

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13
Q

If the patient complains of there temporary causing them pain and you notice that it is broken or cracked this could be due to:

A

Temporary too high (occlusal contacts too high)

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14
Q

List the occlusal contact requirements of a provisional restoration:

A
  1. ideal centric occlusion contacts
  2. lateral and protrusive guidance where appropriate (anterior teeth)
  3. no contact in lateral or protrusive on posterior teeth
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15
Q

Describe what type of margins should be seen with a provisional:

A

Non-impinging margins

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16
Q

Physiological contours, emergence profiles, embrasures, and proximally contacts allow for a good:

A

Provisional periodontal interaction

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17
Q

In regards to provisional marginal integrity, the fit of the provisional should be:

A

as close to the finish line of the tooth as possible

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18
Q

What type of surface finish should the margin of a provisional display? How would you check this?

A

Smooth surface finish, make sure its undetectable with an explorer

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19
Q

In regard to provisional marginal integrity, seal the margin to prevent:

A

pian, sensitivity, or dislodgment

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20
Q

Your patient comes three days after provisional placement with pain and sensitivity of the gingiva and states that the provisional has dislodged from the tooth, what is the likely cause?

A

You did not accurately seal the provisional at the margin, and the gingiva is now irritated

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21
Q

Describe the emergence profile of a provisional margin:

A

Emergence profile is flat or slightly concave NOT convexed or bulging

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22
Q

T/F: The provisional margin emergence profile should be convexed.

A

False- it should be flat or slightly concave NOT convexed or bulging

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23
Q

What does a rough margin on a provisional lead to?

A

Leads to plaque accumulation and gingival inflammation

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24
Q

What can lead to very challenging impressions or crown seating?

A

bleeding gums

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25
Q

What is needed in the provisional for strength?

A

Adequate thickness of the material

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26
Q

Since a temp requires adequate thickness of material to withstand forces without breaking or dislodgment, this requires:

A

adequate tooth reduction

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27
Q

What temporary restoration material is being described below:

  • easy to use and trim and polish
  • used clinic and lab
  • brittle material which can fracture if occlusal load is too strong and if material is too thin
A

Bis-Acryl

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28
Q

What allows the maintenance of phonetics with a provisional?

A

Proper tooth length, position, and contours

29
Q

What factors contribute to provisional esthetics and phonetics?

A
  1. proper tooth length, position and contours
  2. facial lip support
  3. proper tooth form and appearance
  4. compatible tooth shade
30
Q

T/F: Most interim materials shrink as they solidify

A

true

31
Q

The ____ forms the external portions of the interim while the ____ forms the internal of the interim.

A

matrix; preparation

32
Q

What materials may be used for temporary prefabricated crowns?

A
  1. aluminum or tin-silver
  2. stainless steel
  3. polycarbonate shells
  4. cellulose acetat shells
  5. VLC moldable crowns
33
Q

Prefabricated crown forms are limited to:

A

single units

34
Q

Pre-fabricated crown forms must be lined with:

A

auto-polymerizing resin

35
Q

Your patient comes in on a Friday at 4pm. They have a wedding the next day and there crown fell off their front tooth and is broken beyond repair. What is the best option?

A

Pre-fabricated crown form (such as poly carbonate shell)

36
Q

What is being described below?

  • less time consuming
  • can be used for singles but required for multiple units
  • improved contours and esthetics
  • simulated planned restorations when used with diagnostic wax up
A

Custom molded interims

37
Q

Currently used materials for provisional restorations include:

A
  1. Acrylic resins
    - poly methyl methacrylate (PMMA) jet acrylic
    - powder/liquid formulations
  2. Bis-acryl composite resins
    - bis- GMA containing mateirals
    - chemically activated
    - light activated
38
Q

What are the advantages of PMMA as a provisional restoration material?

What are the disadvantages of PMMA as a provisional restoration material?

A
  1. Good marginal fit
  2. Good strength
  3. Good polishability
  4. Durability
  5. High exothermic heat increase
  6. Low abrasion resistance
  7. Free monomer toxic to pulp
  8. High volumetric shrinkage
39
Q

What are the advantages of Bis-Acryl as a provisional restoration material?

What are the disadvantages of Bis-Acryl as a provisional restoration material?

A
  1. Good marginal fit
  2. Low exothermic heat increase
  3. Good strength
  4. Low shrinkage

1.Surface hardness
2. Less stain resistance
3. Limited shade selection
4. Limited polishability
5. Brittle

40
Q

What provisional material involves a chemical conversion of monomer to biological inert polymer through a chain reaction?

A

PMMA (Jet Acrylic) temporary material

41
Q

What component of PMMA may be toxic to the pulp?

A

Unreacted free monomer

42
Q

Inadequate polymerization of PMMA results in:

A

poor mechanical properties

43
Q

Describe the polymerization of PMMA:

A

Polymerization is EXOTHERMIC and there is SHRINKAGE upon polymerization and cooling

44
Q

What are the properties associated with the monomer of PMMA?

A

Chemical or allergic irritation

45
Q

What are the properties of the “set material”of PMMA?

A
  1. exothermic reaction
  2. volumetric shrinkage
  3. increased strength due to polymerization
46
Q

Properties of polymer (powder)

  1. With proper amount we have:
  2. Too little powder =
  3. Too much powder =
A
  1. adequate strength and handling
  2. loss of strength
  3. poor handling and adaptation
47
Q

What components of PMMA are the “liquid”?

A

Monomer and activator

48
Q

What components of PMMA are the “powder”?

A

Filler and initiator

49
Q

Monomer and activator describe the ____ components of PMMA while filler and initiator describe the ____ components of PMMA

A

liquid; powder

50
Q

You must continually put on and take off the temporary as you trump and polish it so that it will still fit the tooth because of:

A

shrinkage that occurs during polymerization

51
Q

What provisional material is being described?

  • good marginal fit
  • good strength
  • polishes well
  • good durability
A

PMMA

52
Q

What provisional material is being described?

  • toxic monomer
  • high exothermia
  • high shrinkage
  • low abrasion resistance
A

PMMA

53
Q

What provisional material is being described?

  • good marginal fit
  • low exothermia
  • low shrinkage
  • good surface hardness
  • good biocompatibility
  • good color stability and patient acceptance
  • can light cure
A

Bis-Acryl Resin

54
Q

What provisional material is being described?

  • limited polishability
  • no rubbery stage
  • high cost
  • brittleness
A

Bis-acryl resin

55
Q

The most commonly used materials for provisionals

A

bis-acryl

56
Q

Problems with interim restorations include:

A
  1. time to fabricate
  2. length of time temp is required in the mouth
  3. materials are good but not great
  4. managing deficiencies (relining and repairing)
57
Q

How should you treat a fractured surface of a provisional?

A

1 grind to expose a fresh surface
2. roughen the surface
3. Use flowable to repair

58
Q

What are the two types of cements for cementation of provisionals?

A
  1. Eugenol
  2. Non-Eugenol
59
Q

What is an example of a eugenol cement?

A

ZOE (Temp bond)

60
Q

What is an example of a non-eugenol cement?

A
  1. polycarboxylate cement (ultra temp)
  2. glass ionomer based cement (smart temp)
  3. resin cement (Telio)
61
Q
  1. Ultra temp =
  2. Smart temp =
  3. Resin cement =
A
  1. polycarboxylate cement
  2. glass-ionomer cement
  3. resin cement
62
Q

Describe the properties of ZOE (temp bond)

A
  1. Low strength
  2. Contains eugenol- sedative for tooth
  3. Eugenol can inhibit resin polymerization
63
Q

Describe the properties of polycarboxylate cement (Ultratemp):

A

low strength cement (non-eugenol)

64
Q

Describe the properties of glass-ionomer based cement (temp smart):

A

Longer term temporary use (non-eugenol)

65
Q

Describe the properties of resin cement (Telio)

A

Transulecent (non-eugenol)

66
Q

With cementation you should mix equal parts of ___ and ___ on a mixing pad with spatula

A

Base; catalyst

67
Q

What should you do AFTER cementation of a provisional?

A

Re-check occlusion (as the cement thickness sometimes inhibits full seating of the provisional)

68
Q

T/F: You should have a thick layer of cement on the axial walls of the provisional

A

False- Thin layer!

69
Q
A

Fixed Prosthodontics I (13 decks)

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