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Dental Materials > Final Exam > Flashcards

Final Exam Flashcards

1
Q

Gamma Phase

A

Ag3Sn

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2
Q

Beta Phase

A

Ag4Sn

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3
Q

Epsilon Phase

A

Cu3Sn

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4
Q

Eta Phase

A

Cu6Sn5

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5
Q

Gamma 1 Phase

A

Ag2Hg3

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6
Q

Gamma 2 Phase

A

Sn8Hg

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7
Q

Distortion

A
  1. Wax pattern distortion

2. Setting of investment

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8
Q

Air Bubbles

A

Air entrapment on surface of wax during investing

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9
Q

Water Films

A
  1. Jarring of the pattern, separating it from investment

2. Too high Water/Powder ratio

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10
Q

Veins or Ridges

A

Water Films

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11
Q

Fins

A

Heating too rapidly, leading to cracks in investment

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12
Q

Rough Casting

A
  1. High Water/Powder ratio

2. Overheating the alloy

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13
Q

Black Surface, Rough sides of mold

A

Release of Sulfur gases from prolonged heating/heating too high

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14
Q

Deficiency in Casting Surface

A

Foreign Bodies

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15
Q

Localized Shrinkage Porosity

A

Incomplete feeding of molten metal during casting

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16
Q

Microporosity

A

Solidification rate too high from mold or casting temp too low

17
Q

Pinhole Porosity

A

Gases dissolved in metal during melting

18
Q

Large Spherical Voids

A

Gas entrapment during casting

19
Q

Pocket on Cavity Side of Mold

A

Back Pressure Porosity

20
Q

Incomplete Casting w/Round, Shiny margins

A

Incomplete wax elimination

21
Q

Incomplete Casting w/Round, Dull margins

A

Low Water/Powder ratio

22
Q

Conventional Composite

A

8-12 microns, but as large as 50-100 microns

23
Q

Microfilled Composite

A

0.04-0.4 microns

24
Q

Small Particle Composite

A

0.5-3 microns

25
Q

Hybrid Composite

A

0.4-1 microns

26
Q

Zinc Phosphate

A
  • Powder: Zinc Oxide

- Liquid: Phosphoric Acid

27
Q

Zinc Polycarboxylate

A
  • Powder: Zinc Oxide

- Liquid: Polyacrylic Acid

28
Q

Zinc Oxide-Eugenol

A
  • Powder: Zinc Oxide

- Liquid: Eugenol

29
Q

Silicate

A
  • Powder: Aluminosilicate Glass

- Liquid: Phosphoric Acid

30
Q

Glass Ionomer

A
  • Powder: Aluminosilicate Glass

- Liquid: Polyacrylic Acid

Dental Materials (1 decks)

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