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BDS3 OSCE > DMS summary - alloys > Flashcards

DMS summary - alloys Flashcards

1
Q

What are the two forms of stainless steel

A

hard or soft

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2
Q

How is hard stainless steal made

A

work hardening

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3
Q

What is the bauschinger effect (refers to stainless steel use in ortho)

A
  • the coil is more work hardened on the outer surface giving it better spring properties
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4
Q

When is stainless steel prone to fracture

A

When

  • Overworked
  • Mechanical abrasion, crushed or marked
  • Fatigue
  • Weld decay (overheating causes this)
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5
Q

What is the type of stainless steel used in orthodontics

A
  • 18:8 stainless austenitic steel
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6
Q

What is the composition of stainless steel wire (18:8)

A

72% iron

18% chromium

8% nickel

  1. 7% titanium
  2. 3% carbon
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7
Q

What is the function of the iron in stainless steel

A
  • Main constituent - with carbon it forms steel
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8
Q

What is the function of chromium in stainless steel

A

Forms a passive oxide film - corrosion resistance

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9
Q

What is the function of nickel in stainless steel

A
  • Improves corrosion resistance and strength
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10
Q

What is the composition of type 4 gold

A
  • 65% gold
  • 14% silver
  • 14% copper
  • 2% zinc
  • 3% palladium
  • 2% platinum
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11
Q

What is the constituents of cobalt chromium

A
  • 54% cobalt
  • 25% chromium
  • 15% nickel
  • 5% molybdenum
  • 0.4% carbon
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12
Q

What is a phase

A

physically distinct homogenous structure

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13
Q

What is a solution

A

homogenous mixture at a atomic scale

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14
Q

What is a dislocation

A

defect that exists in metal, alloys that consist of metals of different sizes have a distorted grain structure which impedes dislocations and improves mechanical properties

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15
Q

Compare the different alloys for denture bases

A
  • Type 4 gold has highest density while titanium has lowest (CoCr second lowest)
  • Co-Cr most rigid while type 4 gold is one of the least
  • Stainless steel is the strongest and least ductile
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16
Q

Describe the function of alloys when it comes to porcelain

A

the bonding of metal oxide to porcelain helps eliminate defects/cracks which porcelain is prone to on the porcelain surface. Alloys (bonded to metal oxide) act as support and limit strain that porcelain experiences

BDS3 OSCE (65 decks)

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