Fixed Exam 1 - Framework Design Flashcards by A G

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

Connector

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Which part of the bridge?

Strong, rigid (not brittle)

Framework

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Which part of the bridge?

Function = support and marginal fit

Framework

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Which part of the bridge?

Brittle

Overlaying ceramics

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Which part of the bridge?

Function = esthetics (1mm minimum required)

Overlaying ceramics

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Which part of the bridge?

Resistant to compressive load
Fragile under tensile stress

Overlaying ceramics

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The overlaying ceramic should not exceed ______ mm to avoid fracture

2mm

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

Wearing opposing dentition

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

10 um

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Framework should allow an ________ porcelain thickness

even

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

metal; porcelain

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What type of occlusion?

More conservative prep, as thin as 1mm

Metal

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What type of occlusion?

Stronger occlusal surface (may be indicated for bruxism)

Metal

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What type of occlusion?

May be indicated when there’s limited interocclusal clearance

Metal

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What type of occlusion?

Compromised esthetics - discuss w/ pt while tx planning

Metal

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What type of occlusion?

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

Metal

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What type of occlusion?

Functional cusps are 1.5mm away from interface

Metal

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What type of occlusion?

For functional cusps, avoid eccentric movement contacts going over interface

Metal

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

True

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

porcelain

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Where is plaque accumulation more common?

Interface

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What type of bridge margin?

Excellent margin seal, preserves periodontal health

Metal collar

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What type of bridge margin?

Distortion of framework is avoided during crown fabrication

Metal collar

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What type of bridge margin?

Rigidity during cementation and function

Metal collar

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What type of bridge margin? Designed w/ a 0.5mm - 1mm collar

Metal collar

Which teeth are metal collars used for?

Posterior (due to esthetics)

What type of bridge margin? Hairline collar, disappearing margin

Conventional

What type of bridge margin? Metal and opaque porcelain layer meet simultaneously on the prep's margin

Conventional

What type of bridge margin? Deep chamfer (1mm) or shoulder is recommended to provide rigidity of the metal + esthetics

Conventional

What type of bridge margin has the following disadvantages? Exposed opaque porcelain layer (esthetics) Difficult finishing Marginal adaptation may distort after firing

Conventional

What type of bridge margin has the following esthetic advantages? Eliminates metal on margin Depth in cervical translucency Light transmission through the root

Butt

What type of bridge margin? Commonly used on anteriors

Butt

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

Butt

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

Die spacer

What is the film thickness of the die spacer?

25-50 um

The die spacer is applied within ______ mm from the margin

1mm

What has the following materials? Resins Model paint Thermoplastic polymers dissolved in volatile solvents

Die spacer

Name the 4 rigid connectors

Cast Soldered Welded Loop

What type of connector? Convenient; incorporated in wax pattern to minimize number of steps during fabrication

Cast connector

What type of connector? Fit may be compromised due to distortion of wax

Cast

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

Soldered

What type of connector? Parts being joined don't fuse, but must be wetted to obtain a successful soldering

Soldered

What type of connector? Used when a framework doesn't fit the abutments as a whole unit, but does as independent abutments

Soldered

What type of connector? Adjacent surfaces/parts being connected are fused by heat or pressure

Welded

What type of connector? A filler metal, with a similar melting temp as the framework

Welded

What type of connector? Sometimes required when a diastema needs to be incorporated to a FDP

Loop

What type of connector? Weak design, rarely used

Loop

What type of connector? Consists of a loop on the lingual part of the FDP

Loop

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

Loop

What type of connector? One component goes inside another Incorporated in the wax pattern fabrication stage

Non-rigid

What type of connector? Rarely used now

Non-rigid

Name of female component of non-rigid connector

Mortise

Name of male component of non-rigid connector

Tenon

What type of connector? Path of insertion must be same as the one of the FDP component w/ the tenon

Non-rigid

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

surveyor

What type of connector? Overcomes different path of insertion of abutments

Non-rigid

What type of connector? Segments large, complex FDPs into shorter components that are easier to replace/repair

Non-rigid

What type of connector? Used where there is a questionable distal abutment

Non-rigid

What type of connector? Relieves stresses on long FDPs

Non-rigid

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

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

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

Telescopic crown

What type of bridge? Can prevent over-preparing teeth and the need of endo

Telescopic crown

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

1mm

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

solid cast

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

2nd

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

True

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)

Solid cast

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

marginal seal