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IRS > Cementation > Flashcards

Cementation Flashcards

1
Q

What are the ideal properties of cement?

A 
Long working time with rapid set
Low film thickness
Low solubility 
High compressive and tensile strengths 
Low viscosity 
Adhesion to tooth structure and restorative materials
Biocompatible 
Cariostatic
Translucency or opacity 
Radiopaque - contrast on radiographs
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2
Q

What are the different acid/base cements?

A

Zinc phosphate
Zinc polycarboxylate
Glass ionomer
ZO cements

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3
Q

What are the different resin modified cements?

A

Resin modified GIS

PA modified resins

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4
Q

What are polymeric cements?

A

Hydrophobic resins
Hydrophilic resins
Self-etching resins
Provisional cements

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5
Q

For: metal and metal-ceramic restorations e.g. FULL GOLD AND PFM
Metal and ceramic endodontic posts
All-ceramic reinforced core ceramics
What cements are used with what procedure?

A 
Conventional cementation 
Zinc phosphate cement
Zinc polycarboxylate cement 
RMGIC's
Compomers
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6
Q

What is the presentation of Zinc phosphate?

A

White powder - zinc oxide

With 10% magnesium oxide and clear liquid of 45-64% aqueous solution phosphoric acis

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7
Q

What are the advantages of zinc phosphate?

A

Easy to mix
Sharp, well-defined set
Low cost
Low film thickness

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8
Q

What are the disadvantages of zinc phosphate?

A

Potential for pulpal irritation due to low pH and exothermic reaction
They have no antibacterial action
They are brittle
Low tensile strength
No adhesive qualities
Relatively soluble in the oral environment

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9
Q

What is the presentation of zinc polycarboxylate cements?

A

zinc oxide
10% magnesium oxide and stannous fluoride
Clear liquid 30-40% aqueous polyacrylic acid

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10
Q

What are the advantages of zinc polycarboxylate?

A 
Bond to enamel and dentine and metallic cast restorations 
They have low irritancy
Have antibacterial action 
Low film thickness
Fluoride release
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11
Q

What are the disadvantages of zinc polycarboxylate?

A

Their properties are highly dependent upon handling procedures
They have short working times and long setting times
An exacting technique is required to ensure bonding
Clean up is difficult and timing is critical
Strength and solubility comparable to that of zinc phosphate

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12
Q

What are the different GIC’s used?

A

Aqua-cem
Fuji 1
Ketac-cem
Glass ionomer type I

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13
Q

What are the indications for using GIC

A 
20 years of success
fluoride release 
Bonds to tooth
low expansion/contraction
Moderate strength
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14
Q

What are the problems with using GIC?

A

Some post-op sensitivity

Water sensitive during setting

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15
Q

What are the use suggestions for GIC?

A

Routine use on crowns and bridges

Suggest use of preparation desensitiser (only used for PFM’s now)

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16
Q

What are the different RMGIC’s

A

Fuji plus
Rely-X-luting
Protec cem

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17
Q

What are the indications for RMGIC’s

A 
Fluoride release 
Bond to tooth
Low expansion/contraction
Moderate-high strength - tensile strength higher than GIC
No post-op sensitivity 
Low solubility - good acid resistance
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18
Q

What is the problem with RMGIC’s

A

Swelling - could crack with ceramic material used

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19
Q

What are the use suggestions for RMGIC’s?

A

Excellent for routine use on crowns and bridges - PFM and full gold crowns
Contraindicated for most ceramics

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20
Q

What are the strengths with poly-acid modified resin composites? (compomer cements)

A 
Fluoride release 
Bonds to tooth with pre-treatment 
Moderate-high strength 
No post op sensitivity 
Low solubility
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21
Q

What are the problems with poly-acid modified resin composites

A

little long-term experience

Swelling

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22
Q

What are use suggestions for poly-acid modified resin composites?

A

Excellent for routine use on metal supported crowns and bridges, and lab manufactured composites
Available as chemical, dual or light cure

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23
Q

What are use contraindications for poly-acid modified resin composites?

A

Most ceramics

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24
Q

What are the clinical applications for resin-metal bonding?

A

Resin bonded bridge
Ortho bracket
Intra-oral repair
Composite resin facings

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25
Q

What are the 2 interfaces in resin bonded bridges?

A

Tooth-resin and resin-metal

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26
Q

What are the base metal alloy bonding for:
Resin bonded bridge
Ortho bracket
Composite resin facings

A

Resin bonded bridge Ni-Cr
Ortho bracket S/steel, Co-Cr, Ti
Composite resin facings Ni-Cr, Co-Cr, Co-Ni-Cr, Ti

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27
Q

What are the precious metal alloy bonding for:
Intra-oral repair
Adhesive FPD (bridge)
Composite resin facings

A

Au and Pd alloys for all

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28
Q

What is the procedure for cementing resin bonded bridges?

A

Etching, gritblasting to create a roughened surface

29
Q

What is the luting cement for bonding resin bonded bridges?

A

Dark cure resins and adhesive resins

30
Q

What is the procedure for cementing precious metal bonding?

A

Tin plating
Silica coating
Metal primers

31
Q

What is the luting cement for precious metal bonding?

A

Dark cure resins

Adhesive resins

32
Q

How do you go about cementing Maryland (Adhesive bridge)

A

Conventiona; Bis-GMA type resins
Chemical/dark cure e.g. Comspan
Surfaces etched to increase the SA

33
Q

What are the adhesive resin cements for resin-bonded bridge?

A

Phosphonated resin e.g. Panavia 21 Kuraray - includes primers and etches, bases, and catalysts, oxyguard only sets in anaerobic environment
OR
4-META based resin e.g. superbond

34
Q

What are the properties of resin cements?

A

Strong
Adhesive
Technique sensitive
chemical/dual/light cure

35
Q

What are hydrophobic resins usually used for?

A 
Translucent ceramics can bond on to the material
Veneers and dentine bonded crowns
Adhesive bridges 
Wide range of shades and opacities 
Light or dual cure
36
Q

What are hydrophilic resins used for?

A

High affinity to non-precious metals

Adhesive for metal bridges

37
Q

What are the properties of hydrophilic resins

A

High cost
Chemical or dual cure
Highly oxygen inhibited
e.g. panavia

38
Q

What are self-etch resins used for?

A

All crown retained bridges and for provisional adhesive bridges

39
Q

What are the properties of self-etch resins

A

Easy to use and clean up
Strongly self-adhesive to dentine
dual cure

40
Q

What are the options for a silica coating for intra-oral repair?

A

Silicoater

Tribochemical coating - Rocatec and Cojet

41
Q

How does Tribochemical coating work?

A

Advancing particle into the metal surface

Silicatise the surface at the point of contact - this improves the bond

42
Q

What does the silica coating also need to bond the resin and metal together

A

Silane coupling agent

43
Q

What is involved in the CoJet system?

A

CoJet material
ESPE-Sil
Visio-Bond
Sinfony Opaquer (masks out the metal colour)

44
Q

What are the step for using the CoJet system?

A 
Pre-treat with CoJet
Apply ESPE-Sil
Cover exposed metal surfaces thinly with Sinfony opaquer
Light cure 10 secs
Apply Visio-Bond, light cure 20 secs
Complete with LC composite 
Light-cure
Finish
45
Q

What is the disadvantage of the CoJet system?

A

Doesn’t last long, can drop off
Many steps
Technique sensitive

46
Q

What is the advantage of the CoJet system?

A

don’t need to cut the crown/bridge off

Effective in enhancing the bond strength to any alloy

47
Q

What is the metal primer?

Why are they used?

A

Bifunctional monomer

They enhance the bond strength between precious metal alloys and resin

48
Q

What are examples of resin-bonded ceramics?

A

Glass ceramics

Dentine bonded crowns

49
Q

What is the procedure for cementing resin-bonded ceramics?

A

HF etch and silane

50
Q

What is the luting cement for resin-bonded ceramics?

A

Aesthetic dual cure resin

51
Q

What are the 2 phases pf glass ceramics?

A

Glass phase and crystalline phase

52
Q

Why etch the glass ceramic first?

A

To dissolve the glass stage, cement infiltrates into the structure of the ceramic

53
Q

What do dentine bonded crowns use?

A

Lithium disilicate

54
Q

What is the bonding mechanism for resin-bonded cements/

A

Hydrophilic surface -> Methacrylate surface
Silicaloxide and methacrylate bonds made
Add coupling agent which bonds to the oxide layers as well
On restoration HF etch and or silane
On the prepared tooth total etch

55
Q

Why do you get a higher strength bond using resin bonded cement compared to zinc phosphate or GIC?

A

Because it integrates into the material

56
Q

What aesthetic resin luting cement is used for veneers?

A

Light activated - Porcelite

57
Q

What aesthetic resin luting cements are used for ceramic crowns, onlays and inlays?

A 
Dual cure
Mirage FLC
Nexus 
Calibra 
Variolink
Rely-X ARC
58
Q

Which restorations use resin-resin bond

A

Composite restorations
Fibre re-inforced resin bridges
Fibre reinforced endodontic posts

59
Q

What are the luting cements for :
Composite restorations
Fibre re-inforced resin bridges
Fibre reinforced endodontic posts

A

Aesthetic dual cure resins

Adhesive resins

60
Q

Where (mainly) do we need the resin-resin bond?

A

Incremental build up of direct composites

Prefabricated resin composites: inlays, fibre reinforced bridges and endodontic posts

61
Q

How are the resin composites first fabricated?

A

Grit blasting or grinding
HF etching
Silane coupling agent
Tribochemical coating

62
Q

What does loss or failure of the temporary restoration lead to?

A

Pain
Overeruption and loss of space
Drifting of proximal teeth
Damage to core preparations

63
Q

What are the functions of temporary cementation?

A 
Provides a seal
Prevent marginal leakage 
Prevent pulpal irritation 
Low strength to allow easy removal - want to remove whole
protect preparation
64
Q

What are the ideal properties of temporary cementation?

A

Ability to seal against leakage of oral fluids
Strength consistent with intentional removal
Low solubility
Biocompatibility
Chemical compatibility with provisional polymer
Easy to use
Ease of eliminating excess
Adequate working and setting times
Compatibility with definitive luting agent

65
Q

What materials are used for temporary cementation?

A

Fine particle zinc oxide eugenol cement e.g. Tempbond

Non-eugenol cements - TempbondNE - doesn’t have problems with resin based materials

66
Q

Which cements cant be used because the strength will be too high?

A

Zinc phosphate
Zinc polycarboxylate
GIC
Difficult removal can damage the prep

67
Q

What are the advantages of ZoE?

A

Easy removal enabling reuse of the restoration
Acceptable sealing properties
Obtundent effect on pulp
Ease of use

68
Q

What are the disadvantages of ZoE

A

Free eugenol acts as a plasticiser of methacrylate resin and reduced surface hardness and strength
Eugenol can interfere with bond strength of resin cements
Must ensure all cement is removed prior to definitive resin cement
Eugenol free zinc oxide is available

IRS (16 decks)

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