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Fixed final > Hot Topics Fixed Final > Flashcards

Hot Topics Fixed Final Flashcards

1
Q

a dental prosthesis worn for varying periods of time, which maintains esthetics, provides masticating surfaces and protects the hard and soft tissues

A

provisional

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2
Q 
Ease of fabrication and alteration
Strength and resistance to wear abrasion
Inert to eugenol
Poor thermal conductivity
Esthetically acceptable- tooth colored
Color stable
Non-irritating to pulpal tissues
A

desirable characteristics of provisionals

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3
Q 
Establish occlusion and occlusal plane
Verify tooth prep reductions
size and position of missing teeth
determining path of insertion
evaluation of pontic design
evaluation of esthetic demands
establishment of proper tooth contour and form
Aid in determining condition of cracked tooth
A

diagnostic characteristics of provisionals

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4
Q 
Protection
Maintenance of healthy tissues
Facilitates impression
Patient evaluation
Evaluate pontic design
Maintains teeth in position
Provide tissue form for implants
Maintain tissue after crown lengthening
A

Benefits of fabricating accurate and esthetic provisional restorations

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5
Q

Jet acrylic- Lang

Duralay temp- Reliance

A

Polymethyl methacrylates

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6
Q

Bis-GMA composite

Light cured resins (PEM, urethane dimethacrylate)

A

Hybrid provisionals

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7
Q

Best abrasion resistance
Best color stability
Good polishability
Good marginal finish

A

PMM advantages

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8
Q

High heat polymerization (165)
High shrinkage
Monomer irritant to pulp
Eugenol deteriorates resin

A

PMM disadvantages

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9
Q

Indirect techniques
Long-term provisionals
Conventional provisionals
Long span provisionals

A

PMM indications

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10
Q

Split line- Lang
Trim- H. J. Bosworth
Snap- Parkell

A

Polyethylmethacrylate

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11
Q

Low shrinkage
Rubber stage to set
Longer working time
Lower polymerization temp (125)

A

PEM advantages

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12
Q 
Poor hardness
Poor abrasion resistance
Poor color stability
Poor finishability
Eugenol deteriorates resin
A

PEM disadvantages

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13
Q

Short-term provisionals (1-3 wks)
Direct technique
Short span

A

PEM indications

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14
Q

Lowest shrinkage
Negligible heat of polymerization
Lowest pulpal irritability
Eugenol does not affect resin

A

Epimine advantages

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15
Q

High cost/unit
Air bubbles
Poorest in color stability, hardness, abrasion resistance
Cannot be corrected by additions

A

Epimine disadvantages

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16
Q

most biologically compatible when used in direct technique

A

Epimine advantages

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17
Q

Low shrinkage
Corrected by additions
Can be radiopaque

A

Hybrid advantage

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18
Q

Brittle
Repairs and mixing are more difficult
Expensive

A

Hybrid disadvantage

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19
Q

Long span restorations

Long term provisionals

A

Hybrid indications

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20
Q

Pink wax
ESF
PVS impression

A

all are matrices for provisionals

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21
Q

Thickness of polypropylene or poly vinyl matrix

A

0.02”

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22
Q 
Diagnostic wax up
Duplicate cast: Plaster
ESF on cast with plaster index
Minimal preparation on plaster cast
Shell provisional by cast-ESF-index assembly
Abutment teeth preparation
Shell provisional reline intraorally
trim, finish and polish provisional
A

Indirect-Direct Reline Technique

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23
Q

Artificial teeth of a partial fixed dental prosthesis that replaces missing natural teeth, restoring function and appearance

A

pontic

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24
Q

Which mucosal contact should you never use?

A

Saddle ridge lap- impossible to clean

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25
Q

Which mucosal contact do we use?

A

Modified ridge lap- pretty to clean but still esthetic, convex on lingual/palatal side

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26
Q

Which mucosal contact is egg-shaped?

A

Ovate- very esthetic but cannot be used for residual ridge with defects

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27
Q

What are the issues with conical pontics?

A

may create food entrapment on broad residual ridges

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28
Q

Which type of pontic design to use in the posterior?

A

-hygienic pontic

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29
Q

Minimum, pressure free contact with ridge
No acute angles with ridge
Occlusal table equal to the adjacent teeth
Rigidity
Open embrasures
Convex, smooth, properly finished tissue surface

A

Pontic requirements

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30
Q

No tissue blanching
Pass thin floss
No visible space under contact with tissue on visually esthetic areas as possible

A

pontic contact requirements

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31
Q

What is the thickness of the pontic contact in metal?

A

2mm x 2mm

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32
Q

proxabrush
floss threaders
super floss

A

great oral hygiene products to clean pontic

33
Q

To establish a 1mm wide band of metal closely adapted to the tooth, this minimizes dissolution of the luting agent

A

internal margin objective

34
Q

What is the space for the luting agent?

A

25-35 micrometers

35
Q

Proximal contact adjustment- should grip shim stock

A

1st step in delivery sequence

36
Q

Shim stock

A

most accurate way to adjust proximal contacts

37
Q

Sequence of using the round wheels

A

Blue, pink, gray

38
Q

What should you not use to adjust metal proximal contacts?

A

Coarse diamonds- they leave rough surface that is difficult to finish

39
Q

Marginal integrity- disclosing wax, rouge in turpentine, powdered spray (occlude) other detection pasts

A

2nd step in delivery sequence

40
Q

Which bur is best used to adjust intaglio surface?

A

1/2 round or 330

41
Q

Stability

A

3rd step in delivery sequence

42
Q

These can all affect what part of the pontic?

Nodules, distortion during impression or cast, parallelism between abutments, undercuts

A

All can affect stabilty

43
Q

Occlusal adjustment

A

4th step in delivery sequence

44
Q

Which occlusal contacts are you assessing when adjusting the restoration for delivery?

A

-centric and eccentric occlusal contacts

45
Q

Which burs can you use to adjust occlusal contacts

A

white stones
fine diamonds
fluted carbides

46
Q

Lateral and protrusive contacts

A

eccentric occlusal contacts

47
Q

metal crown occlusal surfaces are best finished with what kind of burs?

A
  • carbide
  • white stone
  • green stone
48
Q

which bur is best to enhance and maintain the anatomy of the crown?

A

-small football bur

49
Q

What is the color progression of the gold polishing kit?

A

Abrasive silicone wheels:

  • coarse brown
  • dark green medium
  • light green fine
50
Q

Contouring

A

5th step in delivery sequence

51
Q

Adjust these during what step of delivery?
Gingival third
Embrasures
Pontic design

A

contouring (5th step)

52
Q

Flexible diamond disk
porcelain grinding wheel
Diamonds
Porcelain adjustment kit, abrasive wheels and points

A

-Armamentarium for contouring porcelain

53
Q

A fusible metal alloy used to unite the edges or surfaces of two pieces of metal

A

solder

54
Q

This is a designation given to gold solders to indicate the proportion of pure gold contained in 1000 parts

A

Fineness

55
Q

High fusing alloys that slightly melt beneath the softening point of the parent alloy to be joined; should flow well above the fusion range of the subsequent applied porcelain

A

pre-ceramic solders

56
Q

What is the gap distance for soldering complete gold FPDs?

A

-0.25mm

57
Q 
Difficult (narrow melting range)
Volatization of base metal
Microporosity or pitting
Not good bond with porcelain
Color 
Corrosion
A

Disadvantages of Pre-Ceramic soldering

58
Q

Low fusing alloys that melt bellow the pyroplastic range of the porcelain

A

post-ceramic solders

59
Q

Less chance of sag or deformation of the framework
Slightly weaker and more brittle solder joint since frame work cannot be quenched
Small gap space for solder= incomplete joint
Large gap space for solder = decreases strength, higher porosity, higher meniscus, more difficult to solder

A

disadvantages of post-ceramic soldering

60
Q

This is used to limit the spreading of the solder
It is placed in areas of the casting before the flux to prevent the flow of the molten solder
Typically graphite or rouge (iron oxide) with turpentine as a solvent are used in this

A

Antiflux

61
Q 
This is a substance applied to the metal surface to be soldered to remove oxides or prevent their formation
Borax Glass (Na2B4O7) with gold alloys comprise this substance
A

Soldering flux

62
Q

Soldering investments contain what ?

A

Fused quartz

63
Q

How do you restore fatigued color vision?

A

-view pale blue or gray surface between shade matching

64
Q

This is the phenomenon of two objects appearing to match in color under one condition but showing apparent differences under another

A

Metamerism

65
Q

What are the 3 components of color

A

Value- light/dark
Hue- color
Chroma- saturation

66
Q

Vita shade guide color progression from left to right

A

A- red-brown
B- red-yellow
C- gray
D- red-gray

67
Q

First step in vita shade selection

A

Hue

68
Q

2nd step in vita shade selection

A

Chroma

69
Q

3rd step in vita shade selection

A

Value

70
Q

What should you do to enhance your ability to distinguish value?

A

squint- decreases light –> diminish cone sensitivity, increase rod sensitivity

71
Q

Steps in Vitapan - 3D shade guide

A

Value, Chroma, Hue

72
Q

Which shade guide is better at reproducing value?

A

Vitapan 3D master shade guide

73
Q

How do you trick the eye in to thinking teeth are wider/narrower?

A

Move line angles out/in

74
Q

What are the disadvantages of the external color modification and characterization?

A
  • causes a loss of fluorescence

- increases the effect of metamerism

75
Q

How do you externally modify chroma?

A

-add yellow or orange

76
Q

How do you externally modify hue?

A
  • add pink/purple to move towards red

- add yellow to move away from red

77
Q

Adding stains lowers the ____ of the restoration and increases the metameric effect

A

-Value

78
Q

Degree of luster is dependent on what factors

A

Temp and time

79
Q

This process strengthens a porcelain restoration similar to polishing

A

Glazing

Fixed final (3 decks)

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