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indirect Restoration > * Focused Lec Quiz 3/30 Cad/Cam II/ Ceramic material II > Flashcards

* Focused Lec Quiz 3/30 Cad/Cam II/ Ceramic material II Flashcards

1
Q

CAD/CAM sf:

A

Computer aided design, Computer aided manufacturing

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2
Q

Steps to CAD/CAM:

A

Acquisition, design, fabrictation

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3
Q

3 types of restoration fabrication:

A

chairside, lab, centralized

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4
Q

What type of lab is fixed lab

A

production: centralized- can make rest from tin (?)

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5
Q

Workflow 1:

A

Scan, Design, Chairside of Labside

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6
Q

Workflow 2:

A

Scan, Physical model, conventional restoration Fabricate Labside CAM

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7
Q

Workflow 3:

A

Conventional Impression and Working Cast, Scan and Design, Fabricate Labside CAM

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8
Q

Indications for CAD/CAM:

A

in/ onlay, FCC both pos and ant, veneer, partial FDP, framwork, Bar system from implant prosth, abutment for implant, implant supported crown, implant supported partial FDP, implant supported full arch prosth

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9
Q

custom abutment are specific to:

A

the contours of the tooth to be fabricated

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10
Q

Can you make an implant supported full arch zirconia FDP?

A

yes

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11
Q

Best choice material for edentulous area requiring a flange?

A

zirconia, biocompatible, cleansible

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12
Q

% shrinkage of zirconia:

A

20-22%

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13
Q

Factors to consider when making bar for 6 implant supported full arch denture:

A

thickness/ width of bar, leave space for denture material (acrylic, right?

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14
Q

Leucite Based Ceramic, machinable?

A

yes

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15
Q

What type of ceramic is leucite based?

A

glass

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16
Q

Is Leucite Based Ceramic a 1 or 2 phase material? Name.

A

2: lucite and glass

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17
Q

Ceramic machinable materials;

A

Leucite Based Ceramics, Vita Mark II, EmpressCAD, composite type, Sirona blocks, LiDi (IPS e.max CAD), In-Ceram Alumina (Al203), In-Ceram Zirconia (Al203-Zro2), polycrystalline ceramics, procera alumina, Yttrium-stabilized Zirconium Oxide

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18
Q

Is Paradigm C machinable?

A

no

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19
Q

Ceramic machinable material most often used at school:

A

EmpressCAD (Ivoclar)

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20
Q

LiDi, 1 or 2 phase?

A

2

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21
Q

Anterior LiDi veneer, resin cement, light adhesive bonded, light cure or dual cure?

A

depends on thickness

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22
Q

How to cure Feldspathic porcelain veneer:

A

very thin, light cure adhesive cement, dual cure

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23
Q

Material w 3 phases:

A

Zirconia, Zirconia oxide (ZrO2)

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24
Q

Name the 3 phases of Zirconia or Zirconia oxide (ZrO2)

A

monolithic, tetragonal, cubic

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25
Q

Which phase are we interested in in dentistry for Zirconia or Zirconia oxide (ZrO2)?

A

Tetragonal

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26
Q

Organize the phases of Zirconia or Zirconia oxide (ZrO2), smallest to largest:

A

cubic, tetragonal, monolithic

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27
Q

Phase of Zirconia or Zirconia oxide (ZrO2) at room temp:

A

monolithic

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28
Q

Phase of Zirconia or Zirconia oxide (ZrO2) at highest temp:

A

cubic, smallest

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29
Q

How to prevent the polymorphic transformation rom tetragonal phase to monolithic phase for Zirconia or Zirconia oxide (ZrO2)

A

Add Yttrium oxide (Y203)

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30
Q

Yttrium oxide (Y203) is known as:

A

Y-TZP (Yttrium Stabilized Tetragonal Zirconia Polycrystals)

31
Q

Cause of transition from Tetragonal phase to monolithic for Zirconium or Zirc oxide:

A

cooling, polymorphism

32
Q

% volume change for Zirconium or Zirc oxide:

A

3-5%

33
Q

Area of crack propagation is aka:

A

Process zone

34
Q

Tetragonal particles transforming to monolithic can lead to:

A

crack progagation

35
Q

2 types of sintering ovens:

A

zirconia, ivoclar (dry vs wet, right?)

36
Q

Sintering oven that takes he longest:

A

Zirconia, must cool slowly to not crack

37
Q

TF? LiDI oven can be used for Leucite based as well

A

T.

38
Q

TF? Leucite machinable, leucite based restoration can be used without sintering.

A

T. They can be machined and stained, they don’t have to be crystalized

39
Q

Framework design of Ceramic Machinable materials can be:

A

monolithic or layered

40
Q

Monolithic doesn’t have this layer:

A

porcelain layer

41
Q

Leucite based can it be monolithic or layered?

A

either

42
Q

Zirconia, mono or layered?

A

either

43
Q

LiDi, mono or layered?

A

either

44
Q

In-Ceramic, mono or layered?

A

only layered

45
Q

Layered cores can be made of:

A

zirconia, alumina, in-ceram alumina, then layer of feldspathic porcelain that is specific for substructure

46
Q

Difference in the way monolithic and layered are fabricated?

A

monolithic is 1 block, 1 material

47
Q

What is needed bw layering feldspathic and zirconia substructure and why?

A

supported ceramic design, similar to MCC restoration, metal framework that can support layered ceramic, bc they don’t bond well

48
Q

How to overcome weakness of zirconia base:

A

by having appropriately supported ceramic

49
Q

Layered on labial only, anterior or posterior?

A

anterior

50
Q

Posterior, monolithic or layered?

A

monolithic

51
Q

TF? Both Feldspathic and pressed leucite based are machinable.

A

F. neither

52
Q

TF? No leucite based materials are machinable,.

A

F, pressed is not

53
Q

List 3 machinable, commonly used materials:

A

LiDi, Aluminum, Zirconium

54
Q

As amt of crystalline inc, flexural strength inc/dec:

A

inc

55
Q

As amt of crystalline inc, translucency inc/dec:

A

dec

56
Q

Other machinable material blocks:

A

wax, PMMA, Titanium, Chrome Cobalt, Composite Resin

57
Q

What don’t you need to do for wax block machining?

A

wax pattern project, mill then cast, noble alloys

58
Q

When to use PMMA block machining:

A

interim

59
Q

Chrome Cobalt Blocks, precious or non?

A

non

60
Q

Very important aspect for crown preps via CAD/CAM

A

smooth, well define margins

61
Q

When to use finish line bevel for ceramic materials:

A

never

62
Q

Finish line width for ceramic:

A

depends on material

63
Q

Shoulder design for ceramic crown preps:

A

mod shoulder or chamfer

64
Q

Angle bw axial wall and finish line fro ceramic cowns

A

90-130’- not bigger than 130’ or it can cause fracture, especially weaker materials, zirconia is slightly different

65
Q

Tooth reduction depends on

A

material, region, layered monolithic,

66
Q

General reductions for ceramic crowns:

A

1-2mm occ, Finish line width: 3.-1mm

67
Q

TF? 0.3mm finish line width for both LidI and Zir,

A

not true for LiDi, T for ziriconia

68
Q

roundness of cusp:

A

1.6mm diameter bur in machine, sme for cusp

69
Q

Where is the holy zone?

A

marginal ridge adaptation area

70
Q

Angel bw cusps for ceramic crowns:

A

> or = to 120-140’, for well seated crown

71
Q

Cusp tip radius:

A

greater than or equal to 0.5mm radius

72
Q

Radias of burs in machine for cusp tips:

A

1mm

73
Q

Incisal edge width for ceramic crowns:

A

at least 1mm

indirect Restoration (54 decks)

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