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D2 Spring > Fixed Exam 1 - Framework Design > Flashcards

Fixed Exam 1 - Framework Design Flashcards

1
Q

Portion of a fixed dental prosthesis that unites the retainers and pontics

A

Connector

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2
Q

Which part of the bridge?

Strong, rigid (not brittle)

A

Framework

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3
Q

Which part of the bridge?

Function = support and marginal fit

A

Framework

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4
Q

Which part of the bridge?

Brittle

A

Overlaying ceramics

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5
Q

Which part of the bridge?

Function = esthetics (1mm minimum required)

A

Overlaying ceramics

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6
Q

Which part of the bridge?

Resistant to compressive load
Fragile under tensile stress

A

Overlaying ceramics

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7
Q

The overlaying ceramic should not exceed ______ mm to avoid fracture

A

2mm

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8
Q

The overlaying ceramic is highly polished/glazed to prevent what?

A

Wearing opposing dentition

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9
Q

What is the ideal amount of wear on the bridge per year?

A

10 um

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10
Q

Framework should allow an ________ porcelain thickness

A

even

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11
Q

Framework should NOT have an abrupt contour change between __________ and ___________

A

metal; porcelain

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12
Q

What type of occlusion?

More conservative prep, as thin as 1mm

A

Metal

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13
Q

What type of occlusion?

Stronger occlusal surface (may be indicated for bruxism)

A

Metal

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14
Q

What type of occlusion?

May be indicated when there’s limited interocclusal clearance

A

Metal

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15
Q

What type of occlusion?

Compromised esthetics - discuss w/ pt while tx planning

A

Metal

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16
Q

What type of occlusion?

For functional cusps, centric occlusal contacts should be in metal surface

A

Metal

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17
Q

What type of occlusion?

Functional cusps are 1.5mm away from interface

A

Metal

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18
Q

What type of occlusion?

For functional cusps, avoid eccentric movement contacts going over interface

A

Metal

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19
Q

T/F: Interproximal should be in either only metal or only porcelain

A

True

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20
Q

Ideally, interproximals should be in _________, because it will be easier to add material if there’s an open contact

A

porcelain

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21
Q

Where is plaque accumulation more common?

A

Interface

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22
Q

What type of bridge margin?

Excellent margin seal, preserves periodontal health

A

Metal collar

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23
Q

What type of bridge margin?

Distortion of framework is avoided during crown fabrication

A

Metal collar

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24
Q

What type of bridge margin?

Rigidity during cementation and function

A

Metal collar

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25
Q

What type of bridge margin?

Designed w/ a 0.5mm - 1mm collar

A

Metal collar

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26
Q

Which teeth are metal collars used for?

A

Posterior (due to esthetics)

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27
Q

What type of bridge margin?

Hairline collar, disappearing margin

A

Conventional

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28
Q

What type of bridge margin?

Metal and opaque porcelain layer meet simultaneously on the prep’s margin

A

Conventional

29
Q

What type of bridge margin?

Deep chamfer (1mm) or shoulder is recommended to provide rigidity of the metal + esthetics

A

Conventional

30
Q

What type of bridge margin has the following disadvantages?

Exposed opaque porcelain layer (esthetics) Difficult finishing
Marginal adaptation may distort after firing

A

Conventional

31
Q

What type of bridge margin has the following esthetic advantages?

Eliminates metal on margin
Depth in cervical translucency
Light transmission through the root

A

Butt

32
Q

What type of bridge margin?

Commonly used on anteriors

A

Butt

33
Q

What type of bridge margin has the following disadvantages?

Requires 1.2mm margin depth to achieve esthetics
Difficult to get marginal seal due to contraction of porcelain towards greatest bulk during firing

A

Butt

34
Q

Agent applied to die to provide space for cement when cementing the restoration

A

Die spacer

35
Q

What is the film thickness of the die spacer?

A

25-50 um

36
Q

The die spacer is applied within ______ mm from the margin

A

1mm

37
Q

What has the following materials?

Resins
Model paint
Thermoplastic polymers dissolved in volatile solvents

A

Die spacer

38
Q

Name the 4 rigid connectors

A

Cast
Soldered
Welded
Loop

39
Q

What type of connector?

Convenient; incorporated in wax pattern to minimize number of steps during fabrication

A

Cast connector

40
Q

What type of connector?

Fit may be compromised due to distortion of wax

A

Cast

41
Q

What type of connector?

Involves the use of an intermediate metal alloy with a lower melting point than the rest of the framework

A

Soldered

42
Q

What type of connector?

Parts being joined don’t fuse, but must be wetted to obtain a successful soldering

A

Soldered

43
Q

What type of connector?

Used when a framework doesn’t fit the abutments as a whole unit, but does as independent abutments

A

Soldered

44
Q

What type of connector?

Adjacent surfaces/parts being connected are fused by heat or pressure

A

Welded

45
Q

What type of connector?

A filler metal, with a similar melting temp as the framework

A

Welded

46
Q

What type of connector?

Sometimes required when a diastema needs to be incorporated to a FDP

A

Loop

47
Q

What type of connector?

Weak design, rarely used

A

Loop

48
Q

What type of connector?

Consists of a loop on the lingual part of the FDP

A

Loop

49
Q

What type of connector?

May be cast w/ rest of framework or shaped w/ a Pt-Au-Pd alloy wire

A

Loop

50
Q

What type of connector?

One component goes inside another
Incorporated in the wax pattern fabrication stage

A

Non-rigid

51
Q

What type of connector?

Rarely used now

A

Non-rigid

52
Q

Name of female component of non-rigid connector

A

Mortise

53
Q

Name of male component of non-rigid connector

A

Tenon

54
Q

What type of connector?

Path of insertion must be same as the one of the FDP component w/ the tenon

A

Non-rigid

55
Q

For non-rigid connectors, paralleling is usually accomplished with a __________

A

surveyor

56
Q

What type of connector?

Overcomes different path of insertion of abutments

A

Non-rigid

57
Q

What type of connector?

Segments large, complex FDPs into shorter components that are easier to replace/repair

A

Non-rigid

58
Q

What type of connector?

Used where there is a questionable distal abutment

A

Non-rigid

59
Q

What type of connector?

Relieves stresses on long FDPs

A

Non-rigid

60
Q

What are the 3 ways non-rigid connectors can be prepared

A

Freehand (most difficult)
Precision machine
Pre-fabricated plastic patterns

61
Q

What type of bridge?

Metal coping designed to correct the path of insertion of an abutment that is tilted (usually mesially); the coping is used as a retainer to fabricate the FDP

A

Telescopic crown

62
Q

What type of bridge?

Can prevent over-preparing teeth and the need of endo

A

Telescopic crown

63
Q

Telescopic crowns require an additional ______ mm of clearance to fit the additional metal coping

A

1mm

64
Q

The fabrication of a _________ ________ is always required when treating a pt for a FDP where multiple abutments will be splinted

A

solid cast

65
Q

Solid casts should be made from the _____ pour of the same final impression used to fabricate the master cast (1st pour = master cast)

A

2nd

66
Q

T/F: The solid cast should NOT be pin indexed and sectioned

A

True

67
Q

The lab tech uses this to verify the framework’s fit on a cast that has not been altered and has no removable components (master cast)

A

Solid cast

68
Q

Precision between the abutment’s relationship is important to ensure a good _________ _________

A

marginal seal

D2 Spring (18 decks)

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