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BDS3: DMS > Dental Ceramic Techniques > Flashcards

Dental Ceramic Techniques Flashcards

1
Q

Name some ceramic systems.

A 
Aluminous core (PJC) e.g. Vitadur
Porcelain fused to metal (bonded crowns) e.g. Vita
Platinum foil veneers
Injection mounded ceramics
Refractory based ceramics
Ceramic restorations e.g. Belle Glass NG
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2
Q

What is aluminous core?

A

Alumina reinforced feldspathic porcelain utilising platinum foil matrix

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3
Q

What are the advantages of aluminous core (PJC)?

A 
Inexpensive
No specialised equipment
Aesthetic matrix
Biocompatible
Ideally for post crowns only
Platinum foil recycled
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4
Q

What are the disadvantages of aluminous core?

A 
Technique sensitive
Anterior teeth only
Cannot be acid etched
Marginal fit suspect
Destructive lingual prep
Not suitable for implants
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5
Q

What is porcelain fused to metal?

A

Feldspathic porcelain (glass) with high leucine crystal content increasing thermal expansion to that of metal bonding alloys

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6
Q

What are the advantages of porcelain fused to metal?

A 
Relatively inexpensive
May be used for bridges
High strength
Precision attachments
Excellent marginal fit
Metal occlusal possible
Ideally suited to implants
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7
Q

What are the disadvantages of porcelain fused to metal?

A 
Un-aesthetic margin
Destructive labial prep
Metal allergies?
Metal to porcelain bond questionable
Biocompatibility
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8
Q

What are platinum foil veneers?

A

Leucine reinforced feldspathic porcelain adapted for the foil matrix technique.

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9
Q

When would you use porcelain fused to metal?

A

Implants

Fixed prosthodontics - crowns, bridges

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10
Q

What are the advantages of platinum foil veneers?

A 
Relatively inexpensive
No special equipment
Normal cast prep
Platinum foil reclaimed
Can be fabricated quickly
Biocompatible
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11
Q

What are the disadvantages of platinum foil veneers?

A 
Technique sensitive
Prone to fracture during fabrication
Must be etched with hydrofluoric acid
Marginal fit suspect
Not suitable for implants
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12
Q

What are refractory based ceramics?

A

Zirconia reinforced feldspathic porcelain applied to refractory models

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13
Q

What are the advantages of refractory based ceramics?

A

Aesthetic matrix
Good marginal fit
May not need to be acid etched
May be resin bonded

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14
Q

What are the disadvantages of refractory based ceramics?

A

Expensive refractory materials
Specialist equipment may be necessary
Model duplication and refractory prep may incorporate errors
Single units only

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15
Q

What are injection mounded ceramics?

A

Heat pressed leucite feldspathic porcelain with glass matrix.
Ceramic injected into a clear mould.

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16
Q

What are the advantages of injection mounded ceramics?

A 
Good marginal adaptation
Lost wax technique may be used for fabrication
May be used for posteriors
Translucent matrix
Biocompatible
17
Q

What are the disadvantages of injection mounded ceramics?

A 
Expensive ceramic blocks
Specialist equipment necessary
Translucent matrix (shade only 40-50microns)
Single units only?
Not suitable for implants
18
Q

What is Cad-Cam ceramics?

A

Factory produced machinable ceramics fabricated with computer aided design.
Uses an intra-oral scanning system (no impressions required)

19
Q

What are the advantages of Cad-Cam?

A 
Industrially produced matrix
Machinable matrix
Biocompatible
May be used for bridges
Surgery fabrication possible
20
Q

What are the disadvantages of Cad-Cam?

A

Very expensive equipment
Expensive ceramic blocks
Uniform colour?

21
Q

What are ceromeric restorations?

A

Ceramic optimised polymers e.g. Belle Glass
Not as rigid as pure ceramic - allow some flexibility.
Good in canine guidance area for this reason.

22
Q

What are the advantages of ceromeric restorations?

A 
High flexor all modulus
Excellent aesthetics
May be used for bridges
Thermal coefficients of expansion v close to natural teeth
Repairable intra orally 
Wear rate v close to natural teeth
23
Q

What are the disadvantages of ceromeric restorations?

A 
Expensive
Reinforcement necessary
Water absorption?
Specialised equipment necessary
Single units only for implants
24
Q

What are the constituents of dental ceramics/porcelains?

A 
SiO2 (57%)
AlO2 (16%)
KaO2 (11%)
Na2 (9%)
Other metal oxides

BDS3: DMS (8 decks)

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