RD 4 > PFM > Flashcards

PFM Flashcards

(19 cards)

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1
Q

What do metal ceramic restorations combine?

A

Fit and strength of metal with esthetics of ceramics

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2
Q

What are advantages of metal ceramic restorations?

A
  • Strength and cosmetics
  • Longevity
  • Can predictably be used for fixed bridges
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3
Q

What are disadvantages of MCR?

A
  • Greater reduction compared to FGC
  • Porcelain can be more abrasive than gold
  • Limited translucency compared to all ceramic crowns
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4
Q

What are the components of MCR?

A
  • Metal casting
  • Ceramic fused to casting
  • 3 ceramic layers
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5
Q

What are the 3 ceramic layers of MCR?

A
  • Opaque
  • dentin/body
    -incisal/enamel
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6
Q

What components go into bonding the materials together?

A
  • Chemical
  • Mechanical
  • Thermal compatibility
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7
Q

What are the goals for prep design of PFM?

A
  • Create enough space for materials
  • Consrve tooth structure and preserve pulp
  • Maximize retention and resistance
  • Match material to finish line geometry
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8
Q

Dimension of occlusal reduction required

A

1.5-2mm

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9
Q

Required buccal reduction dimension

A

1.2-1.5

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10
Q

What are rec finish lines for PFM?

A
  • Modified shoulder
  • Deep chamfer
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11
Q

When metal and porcelain cover entire occlusal surface, how much reduction is required?

A

2mm

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12
Q

When a conservative variation of PFM crown restores the occlusal surface with all metal, what is the required reduction?

A

0.7-1mm

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13
Q

What reduction is greater, buccal in the coclusal third or cervical?

A

Occlusal

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14
Q

Lingual occlusal 2/3 reduction is

A

1.3-1.5mm

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15
Q

Lingual cervical reductin that is restored with metal is

A

0.5mm

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16
Q

Finish line is deeper ________ to make space for porcelain

17
Q

Anterior reduction req for incisal

18
Q

Anterior reduction req for buccal

19
Q

Anterior reduction req for proximal

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