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AU17: FDP > Midterm > Flashcards

Midterm Flashcards

1
Q

The part of an FPD that is not directly on any tooth structure is called the ______.

A

Pontic

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2
Q

The __________ tooth is the one which is prepped to support the FPD.

A

Abutment

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3
Q

A __________ is any type of device used for the stabilization or retention of a prosthesis.

A

Retainer

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4
Q

T/F: It is important that the patient can clean and pass floss under the pontic.

A

True

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5
Q

If the decay is at the JE, what must be done before the preparation in order to not violate the biological width?

A

Crown lengthening

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6
Q

What are the primary factors for retention?

A
  1. Proper taper
  2. Proper length
  3. Proper width/surface area
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7
Q

What margin design is indicated for a metal-ceramic crown with a disappearing metal collar?

A

Sloped shoulder

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8
Q

What are some disadvantages of the disappearing collar and sloped shoulder?

A
  1. Difficult prep
  2. Greater creep
  3. Rough margin area
  4. Potential gray line
  5. Can be overcontoured
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9
Q

Which type of margin gives optimum esthetics?

A

Butt

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10
Q

What are some absolute indications for a butt margin?

A
  1. Minimal sulcus depth of less than 1 mm
  2. Thin labial tissue
  3. High smile line
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11
Q

What is Ante’s law?

A

Determines what types of FDPs will be successful based on the root surface area of the abutments

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12
Q

Which teeth have the highest root surface area?

A

Canines and molars

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13
Q

Which types of ceramics are used for denture teeth and porcelain jacket crowns?

A

High-fusion and medium-fusion

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14
Q

Which types of ceramics are used for metal-ceramic crowns?

A

Low-fusion and ultra low-fusion

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15
Q

Feldspar is a naturally occuring glass that contains what three compounds?

A

Silica
Fluxes
Alumina

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16
Q

Feldspar, quartz, and other oxides are heated and rapidly cooled which causes the glassy matrix to fracture into many small fragments causing a ______.

A

Frit

17
Q

Zinc oxide is contained in _______-fusing porcelain.

A

Medium

18
Q

_______-fusing porcelain has the highest percentage of silicon oxide.

A

High

19
Q

________-fusing porcelain has the highest percentage of aluminum-oxide.

A

Medium

20
Q

What are the steps for preparing the metal surface for porcelain application?

A
  1. Clean with cleaning solution in ultrasonic cleaning unit (5 min)
  2. Clean with distilled water in ultrasonic cleaning solution (5 min)
  3. Do not touch after cleaning
  4. Oxidation
21
Q

Which enamel for MCC is most translucent?

A

Incisal/Enamel porcelain

22
Q

During oxidation of the metal, should it be done under a vacuum?

A

NO

23
Q

In an MCC, in what order is the porcelain applied to the metal?

A

Opaque -> body -> enamel/incisal

24
Q

T/F: Adjustments to the porcelain should be made with the low-speed hand piece after the first bake.

A

True

25
Q

What must be done before the seconds bake?

A
  1. Clean crown in distilled water in ultrasonic unit for 10 min
  2. Add porcelain to deficient areas
26
Q

What are the advantages to a porcelain margin?

A
  1. Improved esthetics

2. Less plaque retention

27
Q

What are the disadvantages to a porcelain labial margin?

A
  1. Generally inferior marginal adaptation
  2. Decreased strength
  3. More time consuming
  4. Slightly more expensive than MCC
28
Q

What is the direct lift technique?

A

A quick way to add porcelain to the margin of the prep

29
Q

What is the number one cause of failed FPDs?

A

Caries

30
Q

What are four key points to creating optimum occlusion with FPDs?

A
  1. Minimize sliding contacts
  2. Establish anterior guidance
  3. Opposing contacts in same material
  4. Control parafunction
31
Q

T/F: The occlusal contact should be at least 1.5mm from the metal-porcelain junction.

A

True

32
Q

What is required for porcelain to bond to metal?

A

A thin layer of oxide

33
Q

Why would an adhesive failure between metal and porcelain occur?

A

No oxide layer

34
Q

T/F: Cohesive failure in metal is common.

A

FALSE

35
Q

What causes cohesive failure in metal oxide?

A

Excessive oxidation

36
Q

What are the five keys to framework design?

A
  1. Even porcelain thickness
  2. Rounded internal angles
  3. 90 degree metal/porcelain junction
  4. Porcelain wrap-around
  5. Metal thickness of .3 mm

AU17: FDP (1 decks)

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