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DENT MAT ( THIRD YEAR ) > DENTAL PORCELAIN > Flashcards

DENTAL PORCELAIN Flashcards

1
Q

A low melting glass with embedded leucite crystal

A

Dental porcelain

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2
Q

Crystalline material + Fluxes = ?

A

Dental porcelain

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3
Q

2 composition of dental porcelain

A

Crystalline materials

Fluxes

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4
Q

3 crystalline materials

A

Silica
Feldspar
Alumina

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5
Q

2 fluxes

A

Sodium carbonate

Lithium carbonate

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6
Q

3 Classification of porcelain according to fusing temperature

A

High fusing
Medium fusing
Low fusing

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7
Q

Fusing temperature of 871- 1066 degrees celsius

A

Low fusing

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8
Q

Fusing temperature of 1093-1260 degrees celsius

A

Medium fusing

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9
Q

Fusing temperature of 1288- 1371 degrees celsius

A

High fusing

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10
Q

3 properties of dental porcelain

A

Transverse strength
Coefficient of thermal expansion
Color

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11
Q

If high transverse strength= ?

A

Better resistance to fracture

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12
Q

Transverse strength of dental porcelain is

A

56-446 MPa

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13
Q

The amount of expansion of the porcelain when heated and the amount of shrinkage when cooled

A

Coefficient of thermal expansion

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14
Q

For selction of porecelain color

A

Shade guide

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15
Q

Universally used shade guide

A

Vitapan shade guide

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16
Q

Achieved through an oxide layer

A

Porcelain- metal bonding

17
Q

Produces no distinct boundaries between the metal, the oxide layer and porcelain; there is gradual
blend of the three phases.

A

Porcelain fused to metal restoration

18
Q

Non-crystalline low-melting glass

A

Matrix

19
Q

Dispersed crystalline material known as

A

Leucite

20
Q

serves as binding flux for quartz and clay.

A

Fledspar

DENT MAT ( THIRD YEAR ) (4 decks)

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