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PROSTHO > METAL-CERAMIC RESTORATION (cabogs) > Flashcards

METAL-CERAMIC RESTORATION (cabogs) Flashcards

1
Q

Substructure Coated with Ceramic Veneer

A

Egyptian

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2
Q

Vitrification,
Impermeability
Translucency,
Hardness,

A

Chinese

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3
Q

Basic Components Kaolin and Feldspar

A

European 1800’s

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4
Q

Use In Dentistry

A

Pierre Fauchard

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5
Q

is an aluminosilicate mineral derived from the decomposition of feldspar from igneous rock.

A

Kaolin

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6
Q

The term kaolin derives from the name of the deposit in ___ where the mineral was first mined - Kao-ling.

A

China

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7
Q

____ is an important source of alumina in the
glassmaking and ceramics industries. In ceramics, it acts as
a flux and provides the vitreous luster of chinaware and
ceramic tiles.

A

Feldspar

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8
Q

is used in glazes and enamels and is an
important mineral filler in paints, plastics, sealants, and
adhesives.

A

Feldspar

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9
Q

BASIC COMPONENTS OF PORCELAIN

A

• Ball clays
• Kaolin
• Feldspar

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10
Q

The formation of _____ relies on the weathering or
hydrothermal alteration of aluminosilicates. Thus,_____
is formed in soils and sedimentary materials that contain
aluminosilicates.

A

kaolinite

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11
Q

In a variety of manufacturing contexts, such as ceramics,
porcelain, adhesive, concrete additives, and paper filler.

A

KAOLIN

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12
Q

It is also used in medicine for its anti-inflammatory,
antibacterial, antiviral, and antidiarrheal properties.

A

KAOLIN

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13
Q

T/F

PROPERTIES OF KAOLIN

Kaolinite is a white, powdery solid that does not absorb

A

T

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14
Q

T/F

PROPERTIES OF KAOLIN

Its melting point is between ____ and ___ degrees
Celsius

A

740, 1785

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15
Q

T/F

PROPERTIES OF KAOLIN

Its density is ___ grams per cubic centimeter.

A

2.65

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16
Q

T/F

PROPERTIES OF KAOLIN

In ceramics manufacturing, kaolin is used to modify the
properties of a ceramic body with the ball clay (plastic clay),
primarily to control and adjust the casting rate of the ceramic
body.

A

T

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17
Q

Metal substructure supporting a ceramic veneer that is
mechanically and chemically bonded.

A

METAL-CERAMIC RESTORATION

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18
Q

Achieved through firing.

A

METAL-CERAMIC RESTORATION

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19
Q

T/F

METAL PREPARATION
Sharp angles should be
avoided

Internal stress in the final
restoration

A

T

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20
Q

T/F

METAL PREPARATION

Convex surfaces and rounded
contours should be created To avoid development of stress
concentrations

A

T

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21
Q

T/F

METAL PREPARATION

Smooth surface, Facilitates wetting of the
framework by the porcelain
slurry

A

T

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22
Q

T/F

METAL PREPARATION

80° angle should be smooth
and defined for metal-ceramic
junction For easier finishing

A

F
(90° angle should be smooth
and defined for metal-ceramic
junction)

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23
Q

T/F

METAL PREPARATION

The metal framework must be
thick enough to prevent
distortion

A

T

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24
Q

METAL PREPARATION STEPS

A

• Shaping
• Investment Removal
• Oxide Removal
• Metal Finishing
• Cleaning
• Oxidizing

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25
Q

METAL PREPARATION

Ultrasonic cleaning to eliminate all investment material.

A

1

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26
Q

METAL PREPARATION

Oxide layer formed on the metal surface must be partially
removed

A

2

27
Q

METAL PREPARATION

Successful bond depends on controlled thickness of the
metal-oxide layer.

A

3

28
Q

METAL PREPARATION

Finishing the surface in one direction with light pressure
avoids trapping debris between folds of the metal using
ceramic-bound stones to prevent contamination

A

4

29
Q

METAL PREPARATION

Should be airborne-particle abraded with aluminum oxide to
create a satin finish on the veneering surface

A

5

30
Q

METAL PREPARATION

Should conform to all specified minimum dimensions to
avoid distortion during firing

A

6

31
Q

METAL PREPARATION

The metal-ceramic interface should be configured at right-
angle.

A

7

32
Q

METAL PREPARATION

Small particles, grinding debris, oil, and finger grease must
be removed because they interfere with the wetting process
(ultrasonic cleaning or by steam cleaning)

A

8

33
Q

METAL PREPARATION

Controlled oxide layer must be created on the metal surface
to establish chemical bond between metal and porcelain

A

9

34
Q

METAL PREPARATION

The first porcelain application can be performed as soon as
the casting has cooled off to room temperature after it is
removed from the furnace

A

10

35
Q

ALLOY COMPOSITION

A

HIGH-NOBLE

SEMI-PRECIOUS OR NOBLE

NON-PRECIOUS OR BASE METAL

36
Q

60% noble metals, including a combination of
gold, platinum, or palladium with a minimum of
40% gold content.

A. HIGH-NOBLE
B. SEMI-PRECIOUS OR NOBLE
C. NON-PRECIOUS OR BASE METAL

A

A. HIGH-NOBLE

37
Q

25% or more gold or other noble metals
supplemented with other metal Elements.

A. HIGH-NOBLE
B. SEMI-PRECIOUS OR NOBLE
C. NON-PRECIOUS OR BASE METAL

A

B

38
Q

Less than 25% noble metal content combined
with chromium beryllium, nickel, and cobalt.

A. HIGH-NOBLE
B. SEMI-PRECIOUS OR NOBLE
C. NON-PRECIOUS OR BASE METAL

A

C

39
Q

Additional elements may include tungsten,
manganese, iron, silicon, carbon, and
molybdenum.

A. HIGH-NOBLE
B. SEMI-PRECIOUS OR NOBLE
C. NON-PRECIOUS OR BASE METAL

A

C

40
Q

Produced from blend of
o Quartz (SiO₂)
o Feldspar (potassium aluminum silicate orthoclase, sodium aluminum silicate albite)
o Other oxides

A

DENTAL PORCELAIN

41
Q

• Heated to high temperature.
• Frit is ball-milled to desired particles

A

DENTAL PORCELAIN

42
Q

Formulations designed for metal ceramics consist of mixture
of two frits; a low fusing glass frit and a high expansion frit

A

DENTAL PORCELAIN

43
Q

Crystalline leucite with tetragonal symmetry

A

DENTAL PORCELAIN

44
Q

Also contains alumina (Al₂O₂) which acts as intermediate oxide to increase the viscosity and hardness of the glass

A

FELDSPAR

45
Q

Results to good resistance to slump and pyroplastic flow

A

FELDSPAR

46
Q

Necessary for obtaining the desired configuration of the
restoration.

A

FELDSPAR

47
Q

Opaque

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

A

48
Q

Masks the dark metal oxide

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

A

49
Q

Primary source of color

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

A

50
Q

Body/dentin porcelain

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

B

51
Q

Slightly translucent

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

B

52
Q

Enamel porcelain

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

C

53
Q

More translucent

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

C

54
Q

Contains little pigmentation

A. FIRST LAYER
B. SECOND LAYER
C. SUPERFICIAL LAYER

A

C

55
Q

CERAMIC LAYERS

Noble metal alloy = ___mm

A

0.3mm

56
Q

CERAMIC LAYERS

Base metal alloy = ___mm

A

0.2

57
Q

must wet the surface easily, 1° source of
color, 0.1mm

A

Opaque Porcelain

58
Q

built to anatomic contour; incisal, body,
gingival

A

Body and Incisal
Porcelains

59
Q

intrinsic staining by incorporating colored
pigments

A

Internal
Characterization

60
Q

size, line angles, creating illusion on how
it appears

A

Contouring

61
Q

to create shiny surface, occlusal contact
is altered

A

Glazing and
Surface
Characterization

62
Q

surface stains

A

External
Characterization

63
Q

is the primary layer porcelain for improving the
adhesive strength and controlling the color of the oxidized surface of
the alloy.

A

Super Opaque

PROSTHO (17 decks)

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