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Intermediate Restorative Skills > Labs > Flashcards

Labs Flashcards

1
Q

What percentage of gold is in high gold content alloys?

A

Over 75% types I-IV

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2
Q

What percentage of gold is in medium gold?

A

40-60%

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3
Q

What percentage of gold is in low gold?

A

15-20% (Ag 40-60% and Pd 40%

Palladium and silver

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4
Q

What alloys are used for metal restorations?

A 
High gold content alloys
Medium gold
Low gold 
Ag-Pd (less than 2% Au)
Co-Cr
Ti alloys
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5
Q

Positives of metal restorations?

A 
Conservation
Accurate fit
Robust, strong
Easy to adjust
Can support RPD
Can act as bridge retainer
Simpe production
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6
Q

How to make metal restorations?

A

CADCAM

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7
Q

Negatives of metal restorations?

A

Aesthetics
Biocompatibility of metals
Thermal conductivity - pulpal protection

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8
Q

Uses of metal restorations?

A

Crowns
Inlay
Onlay
3/4 crown

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9
Q

Types of metal ceramic restorations?

A

Metal ceramic crown
Porcelain fused to metal crown
Bonded crowns

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10
Q

Substructure materials for metal ceramic restorations?

A

Bonding alloys
Precious metal alloy
NiCr/CoCr alloy
CoCr or Ti used in the laser melting systems

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11
Q

How do bonding alloys differ to the alloys used for metal restorations?

A

Higher melting temp
Have a TEC to match the ceramic
Are rigid to prevent the ceramic debonding
Contain base metal to create metal oxide on the surface which is required for the metal-ceramic bond

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12
Q

Positives of metal ceramic restorations?

A 
More aesthetic than all metal
Strong
Can act as retainer for bridge
Can support RPD 
Design can incorporate attachments
More conservative palatal prep
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13
Q

What does the quality of metal ceramic restorations depend on?

A 
Support the ceramic correctly
Polish/porosity
Fitting surface
Contact points
Model - duplicate model 
Shape
Shade
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14
Q

Production techniques for metal ceramic restorations?

A

Wax pattern produced by hand or CAD
Wax pattern converted to metal via lost wax casting
OR CAD may be produced by milling or selective laser melting of definitive alloy
Metal surface conditioned for ceramic bond
Ceramic is sintered onto the metal surface

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15
Q

Types of all ceramic restorations?

A 
High strength substructure
- Zirconia or alumina 
Resin bonded restoration
- Feldspathic type ceramics
Lithium disilicate
- Stronger materials
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16
Q

Resin bonded restoration examples?

A

Crown, inlay, onlay, veneer, 3/4 crowns

17
Q

Features of resin bonded restorations?

A 
All ceramic with no substructure
Material must be susceptible to etching
HF used
Feldspathic ceramic containing leucite
Lithium disilicate
18
Q

How to produce resin bonded restorations?

A

Sintering - use either refractory model or platinum foil to support the ceramic particles in the furnace
OR pressing technique: wax pattern is produced and lost wax process converts wax pattern into ceramic
OR production via milling
Material must be etched and restoration bonded

19
Q

How do high strength ceramic restorations gain support?

A

Resin bonded restoration - support from tooth
PFM - support from metal substructure
High strength ceramic for support

20
Q

High strength ceramic substructure production?

A 
CAD CAM (previously slip-casting)
Ceramics are sintered onto substructure
21
Q

Zirconia substructure material examples?

A

Procera (alumina), Lava, Zircon Zahn

22
Q

Zirconia features?

A

Very opaque but translucent options available

Milled 20% oversize due to shrinkage from firing

23
Q

Examples of glass infiltrated substructure materials?

A

In ceram

  • Spinell
  • Zirconia
  • Alumina
24
Q

Spinell indications?

A

Translucent
Not as strong
Single anterior units only

25
Q

Aluminia indications?

A

Reasonably translucent
Single units
Strong
Anterior bridges

26
Q

Zirconia indications?

A

V strong
Bridge frameworks
Full contour restorations
RPD support

27
Q

Positives of high strength ceramic restorations?

A

Aesthetics
V strong
Relatively simple to produce
Biocompatible

28
Q

Negatives of high strength ceramic restorations?

A 
Expensive equipment 
Confusing choice of materials and production methods
Varying strengths 
Varying optical properties
Most destructive
29
Q

What must you warn the pt of regarding crowns?

A

10-20% of pulp devitalising - if occurs will need to do RCT (nerve is dead, remove nerve, clean the tooth and replace it with a filling)
Crowns may not last forever - replacing and maintenance

30
Q

Anterior crown options?

A

All ceramic - large restorations, aesthetics important
Metal ceramic - large restorations, heavier occlusion, aesthetics less essential
Dentine bonded crown - aesthetics v important, suitable occlusion, minimal tooth restored, white, less tooth removed but weaker

31
Q

Posterior crown options?

A

FGC - minimal tooth prep, least aesthetic, bruxism
All ceramic crown - high strength, most aesthetic
Metal ceramic crown (PFM) - strong, not as aesthetic as all ceramic crowns, less destructive

Intermediate Restorative Skills (21 decks)

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