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Fixed Pros 2020 > Ceramics > Flashcards

Ceramics Flashcards

1
Q

What type of materials make ceramics that are more amorphous?

A

-Glass like properties

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2
Q

What type of properties make ceramics that are more ordered?

A

-Crystalline properties

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3
Q

What are four properties of classic ceramics?

A
  • High in compressive strength
  • Low in Tensile strength
  • High in electrical and thermal resistance
  • Highly resistant to chemical breakdown
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4
Q

T/F Graphite is considered a ceramic and is therefore hard and resists electrical conduction

A

False

-Is soft and conducts electricity well

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5
Q

T/F Zirconia can have very high tensile strength

A

True

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6
Q

T/F Diamond is a ceramic and is not a good thermal conductor

A

False

-It is a good thermal conductor

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7
Q

T/F Ferrites are ceramics that are superconductors and have almost no electrical resistance

A

True

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8
Q

What is a solid transparent plastic made of polymethyl methacrylate known as?

A

-LUcite

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9
Q

What is a white or gray feldspathic mineral composed of potassium and aluminum silicates?

A

-LEucite

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10
Q

What do leucite crystals increase?

A

-Resistance to crack propagation in ceramics

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11
Q

What are three classic ceramics?

A
  • Feldspar
  • Quartz
  • Kaolin
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12
Q

T/F Zirconia is a porcelain

A

False

it is not

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13
Q

What some all ceramic applications?

A
  • Inlays
  • Onlays
  • Veneers
  • Crowns
  • FPD
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14
Q

What are some all ceramic combinations?

A
  • PFZ
  • Porcelain fused to lithium disilicate
  • Heat pressed or machined
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15
Q

Does glassy/vitreous or crystalline have better optical properties?

A

-=Glassy vitreous

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16
Q

What are the properties of glassy or vitreous ceramics?

A
  • Better optical properties
  • Less strength
  • Less resistance to crack propagation
  • Less ordered in structure
17
Q

What are the properties of crystalline ceramics?

A
  • Better mechanical properties
  • More strength
  • More resistance to crack propagation
  • More ordered in structure
18
Q

Is feldspathic porcelain more vitrous or more crystalline?

A

-Vitreous

19
Q

What type of ceramic is more cystalline?

A

-Zirconia

20
Q

What is zirconia?

A

-Oxide of the metal zirconium

21
Q

What are the two forms of zirconia?

A
  • Zircon (zirconium silicate

- Baddeleyite (zirconium oxide)

22
Q

What is the strongest form of zirconia?

A

-Tetragonal

23
Q

What are the three crystalline phases of zirconia?

A
  • Monoclinic
  • Tetragonal
  • Cubic
24
Q

What is added to the tetragonal phase of zirconia to stabilize it at room temperature?

A
  • yttria oxide

- Cerium oxide

25
Q

What is the most opaque of the three forms of zirconia?

A

-Tetragonal

26
Q

What increases resistance to low-temperature aging degradation of zirconia?

A
  • Yttria oxide

- Cerium oxide

27
Q

What does a crack in the zirconia do?

A

-Induces a tetragonal to monoclinic phase change causing the compressive forces to terminate crack propagation

28
Q

Does the yttria or cerium have a higher fracture toughness?

A

-Cerium

29
Q

Is the Yttria or cerium resistant to low temperature aging degradation?

A

-Cerium

30
Q

What causes zirconia surface degradation?

A

-Transformation from the tetragonal phase to the monoclinic phase

31
Q

T/F Highly polished zirconia is much less abrasive than porcelain

A

True

32
Q

What are the factors that increase translucency of zirconia?

A
  • Increasing density
  • Increasing Yittria
  • Increasing amount of cubic phase
  • Decreasing Al2O3
  • Sintering temp
  • Heating method
  • Atmospheric conditions during sintering
33
Q

What does increasing the yittria and increasing the amount of cubic phase do to the zirconia?

A

-Decreased flexural strength and fracture toughness

34
Q

What decreases the hydrothermal stability of zirconia?

A

-Decreasing Al2O3

35
Q

What are the things you DO when adjusting zirconia?

A
  • Use fine or medium diamonds
  • Use light touch
  • Follow order abrasives
  • Slow speed handpiece
36
Q

What are things you AVOID when adjusting zirconia?

A
  • Coarse diamonds
  • Heat
  • Vibration
  • Heavy pressure
  • Non-Diamond abrasives
  • Skipping abrasives
  • High speed handpiece

Fixed Pros 2020 (17 decks)

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