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GI Medicine > Dental Material Science > Flashcards

Dental Material Science Flashcards

1
Q

What are the 3 types of gypsum?

A
  1. Plaster - Beta-HEMIHYDRATE
  2. Dental stone - Alpha - HEMIHYDRATE
  3. Densite (improved stone)
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2
Q

What is the powder to water ratio needed for plaster and stone gypsum?

A

Plaster - 50-60ml per 100g powder

Stone - 20-35ml per 100g

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3
Q

Give 3 examples that may reduce the setting time of gypsum?

A

Increase POWDER quantity
Increase spatulation (re-mixing)
Adding impurities

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4
Q

Name some advantages and disadvantages of gypsum?

A

ADVANTAGES

  1. Dimensionally accurate
  2. Low expansion (particularly densite)
  3. Can replicate 50 micrometres wide grooves
  4. Sufficient compressive strength
  5. Maintains dimensions in storage

DISADVANTAGES

  1. Does not withstand large TENSILE storage
  2. Surface can be abraded easily
  3. Brittle
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GI Medicine (2 decks)

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