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FP > FDP Framework Design > Flashcards

FDP Framework Design Flashcards

1
Q

In fixed dental prosthodontics the portion of a fixed dental prosthesis that unites the retainer and pontic

A

Connector

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2
Q

What is the function of the framework

A

support and marginal fit

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3
Q

Framework
strong or weak?
rigid or flexible?
Brittle?

A

Strong
Rigid
NOT brittle

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4
Q

Overlaying ceramics are a __ material

A

brittle

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5
Q

Function of the overlaying ceramics

A

Esthetics

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6
Q

What is the minimum required for overlaying ceramics

A

1mm

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7
Q

Overlaying ceramics need to be resistant to

A

compressive load

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8
Q

Overlaying ceramics are fragile under

A

tensile stress

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9
Q

ceramic should not exceed __ to avoid fracture

A

2mm

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10
Q

Texture of overlaying ceramics

A

highly polished/glazed to prevent wearing opposing dentition

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11
Q

Ideal wear of overlaying ceramics

A

10 um per year

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12
Q

Darker the color polishing disc the __ the grit

A

heavier
(blue = 1st, pink = 2nd, white = 3rd)

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13
Q

Framework design should be considered during the __ stage

A

Tx planning

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14
Q

Framework design should allow and even __

A

porcelain thickness

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15
Q

Framework design should have proper connector __

A

configuration and design

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16
Q

Framework design should have optimally located __

A

occlusal contacts

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17
Q

Framework design should have no abrupt contour change between

A

metal/porcelain

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18
Q

The ideal way to design framework is by waxing/ designing to ideal contours and then do an even __ of the anatomy contours desired. This way the porcelain has an even __

A

cutback
porcelain thickness

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19
Q

Metal occlusion should be used with a __ preparation

A

more conservative (as thin as maybe 1mm)

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20
Q

This provides a stronger occlusal surface (may be indicated for bruxism)

A

metal occlusion

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21
Q

Metal occlusion may be indicated when theres limited __

A

interocclusal clearance

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22
Q

Downside to metal occlusion

A

compromised esthetics (discuss with patient while tx planning)

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23
Q

With metal occlusion, what cusps should be in metal surface

A

Functional cusps / centric occlusion contacts
- ideally 1.5 mm away from interface
- try to avoid eccentric movement contact going over interface

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24
Q

Interproximal should be on either __

A

ONlY metal or ONLY porcelain

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25
Q

What is used ideally for interproximal

A

ideally in porcelain, it will be easier if porcelain needs to be added to close contact
Esthetics are also better

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26
Q

Where is plaque accumulation more common

A

In the interface

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27
Q

3 types of metal extensions/ margins

A

Conventional
- tooth-metal-porcelain margin interface
Metal Collar
-tooth-metal margin interface
Porcelain Butt Margin (shoulder)
- tooth-porcelain margin interface

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28
Q

How is light transmission different between a conventional and porcelain butt margin (shoulder)

A

With a conventional margin light coming in is reflected by the metal at the interface making a grey ish look to the gingiva making it less esthetic
The porcelain butt margin has enough porcelain that it reflects less light in the cervical region so its more esthetic

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29
Q

This provides an excellent margin seal

A

metal collar

30
Q

This helps to preserve periodontal health

A

metal collar

31
Q

With a metal collar, distortion of framework is __

A

avoided during crown fabrication

32
Q

Metal collar provides __ during cementation and function

A

rigidity

33
Q

Metal collars are usually designed with a __ to __ collar

A

0.5mm to 1mm

34
Q

Disadvantages of metal collar

A

esthetics (more common on posterior teeth)

35
Q

Hairline collar, disappearing margin

A

Conventional margin

36
Q

The metal and opaque porcelain layer meet simultaneously on the preparations margin

A

conventional margin

37
Q

What prep is recommended for conventional margin

A

Deep chamfer (1mm) or shoulder
- for rigidity of metal and better esthetics

38
Q

Disadvantages of conventional margin

A

Exposed opaque porcelain layer
difficult finishing
marginal adaptation may distort after porcelain firing

39
Q

This margin is commonly used on the anterior restorations

A

porcelain butt margin

40
Q

what are the esthetic improvements with porcelain butt margin

A

metal elimination on margin
depth in cervical translucency
light transmission through the root

41
Q

Disadvantages of porcelain butt margin

A

Requires a 1.2mm margin depth to achieve optimum esthetics
Difficult to obtain excellent marginal seal due to contraction of porcelain towards the greatest bulk during firing

42
Q

How should the framework design be prepped

A

You have the freedom to design the framework design as you want, as best it fits each individual case

43
Q

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

A

Die spacer

44
Q

what is the film thickness of the die spacer

A

25-50 um

45
Q

Die spacer is applied within __ from the margin

A

1mm

46
Q

What materials are used for the die spacer

A

Mostly resins are used
Model paint
Thermoplastic polymers disolved in colatile solvents

47
Q

What is a cast connector

A

Convenient - are incorporated in the wax pattern so it minimizes the number of steps during fabrication

48
Q

Disadvantage to cast connector

A

fit may be compromised due to distortion of the wax

49
Q

What is a soldered connector

A

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

50
Q

with a soldered connector, the parts being joined don’t fuse but must be __ to attain a successful soldering

A

wetted

51
Q

When is a soldered connector useful

A

when a framework doesn’t fit the abutments as a whole unit (FDP) but does as independent abutments (possible distortion on the connector/pontic area)
(look at steps in powerpoint to achieve this)

52
Q

What is a welded connector

A

adjacent surfaces, the parts being connected are fused by heat or pressure
- a filler metal with a similar melting temp as the framework can be used during the procedure

53
Q

What is a loop connector

A

sometimes are required when a diastema needs to be incorporated to a FDP

54
Q

This is a weak design and is rarely used

A

loop connectors

54
Q

where is the loop on the loop connector

A

Loop on the lingual aspect of the FDP

55
Q

Loop connectors may be cast with the rest of the framework or shaped with a __

A

Pt-Au-Pd alloy wire

56
Q

Connector design where one component goes inside another

A

Nonrigid connector (rarely used nowadays)

57
Q

Mortise and tenon

A

Mortise = female component of non rigid connector
Tenon = male component

57
Q

Path of insertion of nonrigid connector must be the same as the one of the FDP component with the

A

Tenon

57
Q

The design of the nonrigid connectors are incorporated in the

A

wax pattern fabrication stage

58
Q

With a nonrigid connector, paralleling usually accomplished with a

A

surveyor

59
Q

4 indications for using a nonrigid connector

A

To overcome different path of insertion of abutments
Segmenting large, complex FDPs into shorter components that are easier to replace or repair
Questionable distal abutment
Relieve stresses on long FDPs

60
Q

What are the rigid connectors

A

Cast connector
Soldered Connectors
Welded connectors
Loop connectors

61
Q

What are the 3 ways the nonrigid connector can be prepared

A

Freehand (most difficult)
Precision machine
Prefabricated plastic patterns

62
Q

A metal coping is designed to correct the path of insertion of an abutment that is tilted (usually mesially)

A

Telescopic crown

63
Q

The coping / telescopic crown is used as a __ to fabricate the FDP

A

retainer

64
Q

Telescopic crowns can prevent __ and even the need of __

A

over-preparing teeth
endodontic treatment

65
Q

The Telescopic crown requires an additional __ of clearance to fit the additional metal coping

A

+/- 1 mm

66
Q

The fabrication of a __ is always required when treating a patient for a FDP where multiple abutments will be splinted

A

solid cast

67
Q

The solid cast should be made from the __

A

2nd pour of the same final impression used to fabricate the master cast (1st pour - master cast)

68
Q

Should the solid cast be pin indexed and sectioned

A

NO

69
Q

What is the reason for the solid cast

A

For the technician to verify the frameworks fit on a cast that has not been altered and has no removable components (master cast)

FP (3 decks)

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