Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

indirect Restoration > Lec 1/5 ACC restorations and ceramic materials I > Flashcards

Lec 1/5 ACC restorations and ceramic materials I Flashcards

1
Q

Indications for full coverage resto:

A

extensive coronal damage, max R/R form needed, short crown, axially tilted teeth, restore endo treated teeth, parafunctional habits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Adv of ACC:

A

esthetic, excellent translucency (sim to tooth), good tissue response (biocompatible), lack of reinforcement by a metal substructure permits more conservative reduction of facial surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Disadv of ACC:

A

proper prep design is critical to get mechanical success

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Contraindications, ACC:

A

more conservative restoration can be used, not possible to provide adequate support or an even shoulder width of at least 1mm circumferentially

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Slope of ACC should be:

A

NONE! 90’ modified shoulder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Reductions for CI ACC:

A

1.5mm incisal, 1mm modified shoulder all around, 1.5mm axial reduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Benefit of proper marginal design:

A

good stress distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does occ reduction for ACC depend on?

A

type of ceramic, monolithic, layered, location of resto

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

General occ reduction for ACC:

A

1.5mm - 2mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Type of margin for ACC:

A

butt joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

All ceramics have a glass and a crystalline phase except:

A

polycrystalline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the glass phase of ceramics?

A

Silica, mostly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Crystalline phase ceramics:

A

Leucite, LIDi, Alumina, Magnesia, Zirconia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

2 polycrystalline ceramics:

A

Alumina, Zirconia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are ceramic metals based on?

A

Amt of crystalline phase, fabrication technique

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

As this inc, flexural strength inc:

A

amt of crystalline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Type of Leucite that is between Feldspathic and LiDi in terms of flexural strength:

A

pressed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

TF? Translucency inc, as flexural strength inc.

A

F.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

TF? Translucency inc, as crystalline inc.

A

F.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Ceramics based on crystalline phase:

A

pred glass, particle-filled, polycrystalline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

5 fabrication techniques for ceramics:

A

Conventional Powder/ Slurry Castable, Pressable, Slip-Casting, Machinable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Conventional Powder/ Slurry Ceramics are used mainly as:

A

Veneers, porcelain jacket crown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Material for PJC:

A

Feldspathic or w aluminous core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Disad v of PJC:

A

brittle, easily fractured, poor marginal adaptation,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

PJC developed to improve strength of earlier PJCs:

A

PJC w alumina reinforced core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

How did the 50% inc in alumina crystals in the feldspathic core strengthen the PJC?

A

interruption of crack propogation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Steps to hand fabricate PJC:

A

platinum foil matrix, apply alumina reinforced ceramic, sinter, condense feldspathic porcelain, sinter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

How are castable glass ceramics different than conventional Powder/ Slurry:

A

Props closer to glass, very different construction, “ceramming” process is unique

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Tech to make castable glass ceramic

A

centrifugal casting, only porcelain crown made this way

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Steps to making a castable ceramic crown:

A

invest and burn out wax up, heat ceramic ingot to 1350C, cast using centrifuge, recover glass casting by sandblasting, cut sprues away, ceram, surface stained or layered w layered porcelain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What is ceramming?

A

heat tx process, strengthens glass, microscopic crystals of mica are formed that strengthen glass and red transparency, more opaque, less glass like

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Castable glass ceramics and conventional Powder/ Slurry can be used for these restoration types:

A

none

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Pressable ceramics:

A

Leucite or LiDi based

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

TF? Leucite based pressable ceramics can be monolith or layered, whereas LiDi based pressable ceramic can only be monolithic.

A

F both can be either

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

TF? All ACC’s have superior esthetics than MCCs.

A

F. some don’t, Zirconia doesn’t have good translucency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

zirconia is categorized as ceramic but is actually:

A

metal alloy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

TF? Zirconia has reduced strength compared to MCC.

A

F. metal alloy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

TF? MCC has higher fracture strength that zirconia.

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Lingual red (not finishline) for a lingual metal crown:

A

1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

TF? ACC has less flexural strength than CCC.

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

Which is more forgivable under forces, LiDi or MCC?

A

MCC bc of metal substructure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Margin width needed for LiDi:

A

1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Margin width needed for zirconia;

A

0.5mm -1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Core of Alumina or zirconia is coated w:

A

feldspathic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

TF? Both LiDi + zirconia can be monolithic.

A

T

46
Q

What varies bw all ceramic except polycrystalline, glass phase or crystalline phase?

A

crystalline phase

47
Q

Why is it called predominantly glass phase?

A

there is more glass phase in the material than crystalline phase

48
Q

Particle-Filled Glass Ceramics are mostly glass phase or crystalline phase?

A

crystalline

49
Q

Polycrystalline ceramics, mostly glass phase or crystalline phase?

A

ALL crystalline

50
Q

Does flexural strength inc or dec as you go from primarily glass to polycrystalline?

A

inc

51
Q

How is Feldspathic categorized based on amt of crystalline phase?

A

predominantly glass

52
Q

How is Leucite categorized based on amt of crystalline phase?

A

low-filled, particle-filled glass ceramic

53
Q

How is translucency affected from predominantly glass to crystalline?

A

dec

54
Q

What happens to light if the material is not transparent?

A

absorbed or reflected

55
Q

TF? Every ceramic has a different feldpatic layer, but always feldspatic

A

T

56
Q

Castable glass ceramics, esthetic?

A

t

57
Q

Castable glass, prone to fracture?

A

yes

58
Q

3 steps to castable ceramics:

A

centrifuge (glassy resto), sintering (aka ceramming), staining

59
Q

What is the glass phase of both Leucite and LiDi?

A

silica

60
Q

What is the optimal pressable ceramic?

A

Leucite

61
Q

flexural strength lithium disilicate vs. leucite based

A

350, 130-135

62
Q

Leucite based materials on the market:

A

IPS Empress Esthetic

63
Q

LiDi materials:

A

IPS Empress II, IPS E.max

64
Q

This material requires a special oven for sintering:

A

LiDi

65
Q

Indications for Leucite based:

A

anterior crowns, veneers, in-onlays

66
Q

Lithium disilicate based indications:

A

Ant/pos crowns, veneers, in-onlays, 3-unit Ant FDP (not enough flexural strength for pos)

67
Q

% volume of alumina in In-Ceram Alumina:

A

90%

68
Q

Composition of In-Ceram Spinnel:

A

Magnesia, Alumina

69
Q

Composition of In-Ceram Zirconia:

A

67% Alumina, 33% Stabilized zirconia

70
Q

Benefit of In-Ceram materials:

A

high strength core and layering ceramic

71
Q

Tech that must be used for Slip–Casting (not used in U.S.)

A

layering

72
Q

Technique to make In-Ceram crowns:

A

Slip Casting Technique

73
Q

How to make monolithic slip casting ceramic:

A

can’t, only layered

74
Q

Indications for In-Ceram Spinnel:

A

Ant Crown

75
Q

Indications for In-Ceram Alumina:

A

Ant/Pos crown, Ant FDP

76
Q

Indications for In-Ceram Zirconia:

A

pos crown, ant/pos FDP

77
Q

Can machinable ceramics be either monolithic or layered?

A

yes

78
Q

TF? Both In-Ceram Alumina and In-Ceram Zirconia can be used monolithically.

A

F. In-Ceram, only layered

79
Q

Leucite and LiDi are machined in this phase:

A

green phase, not fully sintered, crystals not grown to full extent, still machinable

80
Q

Lower incidence of complications, ACC or conventional single crown:

A

ACC

81
Q

Most common complications of ACCs:

A

crown fracture (7%), loss of retention, and need for endo (1%)

82
Q

TF? All ceramics area viable option for laminate veneers, intracoronal restos, full coverage restos

A

T

83
Q

TF? The 5y survival rate of In-Ceram Spinnel and In-Ceram Alumina are both lower than that of MCC.

A

F. same

84
Q

Problem with Zirconia veneer:

A

chipping

85
Q

Use these to adjust ACC crowns:

A

blue, pink, green polishing disk/ cone

86
Q

Roughest to smoothest for the extraoral polishers for ACCs:

A

blue pink green

87
Q

Prefer to cut from tooth or crown if crown doesn’t fit

A

tooth, to not create flaws in ceramic

88
Q

If you must cut down crown use this:

A

red striped diamond bur with lots of water

89
Q

The core materials used for layering crowns are both what type of ceramic?

A

polycrystalline

90
Q

The only predominantly glass ceramic:

A

aluminum oxide

91
Q

Air abrasion is aka:

A

Micro-etch

92
Q

Benefit of silica coated alumina over alumina for air abrading:

A

allows good bonding to the silica

93
Q

Predominantly glass materials are derived from:

A

feldspar minerals, silicon and aluminum oxides

94
Q

How are predominantly glass materials used?

A

veneering material over metal or ceramic coping and frameworks, PJC, in-onlays, porcelain veneers

95
Q

Props of predominantly glass ceramic:

A

highly esthetic, biocompatible, resistant to abrasion and compressive forces, low mech strength in comparison w other ceramic types, must be cemented adhesively to inc resistance to fracture

96
Q

Delivery of predominantly glass resto:

A

must use adhesive system, followed by application of a resin cement

97
Q

Type of material, IPS Empress Esthetic:

A

Leucite

98
Q

Prop of low filled particle filled glass ceramics:

A

low strength compared to other filled glass materials

99
Q

TF? Particle filled glass ceramics must be cemented adhesively.

A

T. must use adhesive system, followed by application of a resin cement

100
Q

Ex of a high-filled particle-filled glass ceramic:

A

IPS e.max Press (LiDi)

101
Q

What are particle-filled glass ceramics reinforced w?

A

LiDi

102
Q

TF? LiDi must be cemented adhesively for FCC.

A

F. either (conventionally or adhesively according to prep design)

103
Q

How is conventional cementing carried out?

A

w conventional luting agents such as RMGI cements wo need for intermediate agents

104
Q

How to increase retention for short clinical crowns?

A

cement adhesively

105
Q

TF? Partial coverage particle-filled glass restos such as in-onlays and porcelain veneer restorations require adhesive cementation.

A

T

106
Q

These are densely sintered aluminum oxide or zirconium oxide materials:

A

Polycrystalline ceramics

107
Q

TF? There is no glass in Polycrystalline ceramics:

A

T

108
Q

TF? Polycrystalline ceramics must always be cemented conventionally.

A

F. most of the time, but not always

109
Q

How to inc the bonding strength of resin cements w Polycrystalline ceramics:

A

air abrasion w aluminum oxide or silica coated alumina oxide followed by adhesive promoting agent

110
Q

How to enhance the bond of resin-based luting agents:

A

treat zirconium oxide restos w a combo of tribochemical silica and MDP or using a primer based on phosphate and carboxylate functional monomers or a primer combination of MDP and a metal primer

indirect Restoration (54 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions