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PROSTHO > METAL-CERAMIC RESTORATION (cabogs) > Flashcards

METAL-CERAMIC RESTORATION (cabogs) Flashcards

(63 cards)

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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
METAL PREPARATION Ultrasonic cleaning to eliminate all investment material.
1
26
METAL PREPARATION Oxide layer formed on the metal surface must be partially removed
2
27
METAL PREPARATION Successful bond depends on controlled thickness of the metal-oxide layer.
3
28
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
4
29
METAL PREPARATION Should be airborne-particle abraded with aluminum oxide to create a satin finish on the veneering surface
5
30
METAL PREPARATION Should conform to all specified minimum dimensions to avoid distortion during firing
6
31
METAL PREPARATION The metal-ceramic interface should be configured at right- angle.
7
32
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)
8
33
METAL PREPARATION Controlled oxide layer must be created on the metal surface to establish chemical bond between metal and porcelain
9
34
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
10
35
ALLOY COMPOSITION
HIGH-NOBLE SEMI-PRECIOUS OR NOBLE NON-PRECIOUS OR BASE METAL
36
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. HIGH-NOBLE
37
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
B
38
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
C
39
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
C
40
Produced from blend of o Quartz (SiO₂) o Feldspar (potassium aluminum silicate orthoclase, sodium aluminum silicate albite) o Other oxides
DENTAL PORCELAIN
41
• Heated to high temperature. • Frit is ball-milled to desired particles
DENTAL PORCELAIN
42
Formulations designed for metal ceramics consist of mixture of two frits; a low fusing glass frit and a high expansion frit
DENTAL PORCELAIN
43
Crystalline leucite with tetragonal symmetry
DENTAL PORCELAIN
44
Also contains alumina (Al₂O₂) which acts as intermediate oxide to increase the viscosity and hardness of the glass
FELDSPAR
45
Results to good resistance to slump and pyroplastic flow
FELDSPAR
46
Necessary for obtaining the desired configuration of the restoration.
FELDSPAR
47
Opaque A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
A
48
Masks the dark metal oxide A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
A
49
Primary source of color A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
A
50
Body/dentin porcelain A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
B
51
Slightly translucent A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
B
52
Enamel porcelain A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
C
53
More translucent A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
C
54
Contains little pigmentation A. FIRST LAYER B. SECOND LAYER C. SUPERFICIAL LAYER
C
55
CERAMIC LAYERS Noble metal alloy = ___mm
0.3mm
56
CERAMIC LAYERS Base metal alloy = ___mm
0.2
57
must wet the surface easily, 1° source of color, 0.1mm
Opaque Porcelain
58
built to anatomic contour; incisal, body, gingival
Body and Incisal Porcelains
59
intrinsic staining by incorporating colored pigments
Internal Characterization
60
size, line angles, creating illusion on how it appears
Contouring
61
to create shiny surface, occlusal contact is altered
Glazing and Surface Characterization
62
surface stains
External Characterization
63
is the primary layer porcelain for improving the adhesive strength and controlling the color of the oxidized surface of the alloy.
Super Opaque

PROSTHO (17 decks)

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