Past MCQ Flashcards

1
Q

At what temp does feldspathic ceramic form leucite?

A
  • 1150-1500degrees C
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2
Q

What is Leucite?

A
  • Potassium aluminium silicate
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3
Q

What is PROCERA?

A
  • > 99% alumina core
  • Produced at about 1700 celcius
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4
Q

What temp is Zirconia sintered at?

A
  • 1600C
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5
Q

What is the max amount of strain porcelain will undergo before fracture?

A
  • 0.5%
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6
Q

What is the expansion of gold ?

A
  • 1.4%
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7
Q

What is the expansion of Ni/Cr?

A

2.0%

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8
Q

What is the expansion of Co/Cr?

A

2.3%

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9
Q

What is the longevity of GIC, SSC and Amalgam?

A

SSC = 92%
Amalgam = 80%
GIC = 66%

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10
Q

What are the reasons and % for post core failures?

A
  • 60% due to restorative
  • 32% due to perio
  • 8% due to endo
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11
Q

What are some temp materials used?

A

PMMA:Jet
PEMA: Snap / TRIM
Bis-acrylate composite : Protemp
UDMA : Provipont

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12
Q

What material has best mechanical properties for restoration of occlusal surfaces?

A
  • Gold
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13
Q

What is the best method for retaining a core ?

A
  • Use of adhesive only
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14
Q

When preparing upper first permanent molar for metal-ceramic crown, a functional bevel is placed on which cusp?

A
  • Mesio-palatal
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15
Q

What is the correct degree of axial-taper in ideal crown prep?

A
  • 7degrees
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16
Q

The fit surface of a porcelain laminate veneers is prepared with what acid?

A
  • Hydrofluoric acid