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Prosthodontics > Fixed Prosthodontics Materials > Flashcards

Fixed Prosthodontics Materials Flashcards

1
Q

Porcelain adherence achieved in high noble metal alloys by adding

A

Tin and indium

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2
Q

Green discoloration caused by

A

Silver diffusing into sodium ions in porcelain, this is reduced by substituting potassium ions

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3
Q

Which gold alloy is harderst and strongest

A

ADA type IV

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4
Q

Gold solders are used for

A

Fixed bridgework

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5
Q

Silver solders are used for

A

orthodontic appliances

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6
Q

Modifies the orange color of copper

A

Silver

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7
Q

Increases hardness

A

Copper

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8
Q

Increases resistance to tarnish and corrosion

A

Gold

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9
Q

Recommneded distance between parts to be joined should be

A

0.25mm

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10
Q

A soldering joint should be

A

Circular in form and occupy region of the contact area

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11
Q

Most important prerequisite of soldering is

A

Cleanliness

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12
Q

Most common antiflux

A

Soft graphite pencil

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13
Q

The casting is placed in acidic solution which reduces surface oxides

A

Pickling

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14
Q

Fe(iron) is key in

A

PFM bonding to gold based alloys

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15
Q

Chromium is key in

A

PFM bonding to gold substitute alloys

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16
Q

What is predominant mechanism in metal ceramic bond

A

Chemical form of attachment

17
Q

When materials heated to form glassy mass and. Then rapidly cooled to fracture them into many small fragments is called

A

Frit

18
Q

What are glass modifiers in porcelain

A

Potassium and sodium

19
Q

Most formulations of porcelain consists of

A

Low fusing glass frit and high expansion frit

20
Q

Devitrification occurs if

A

Ceramic is fired too often

21
Q

What happens to porcelain after firing

A

Volumetric shrinkage

22
Q

Which porcelain masks the darkness of metal oxide

A

Opaque porcelain

23
Q

Milky state of porcelain

A

Because of devitrification and it makes glazing difficult

24
Q

Most PFM failures because of

A

Built in stresses in porcelain

Prosthodontics (2 decks)

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