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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
What are the 2 interfaces in resin bonded bridges?
Tooth-resin and resin-metal
26
What are the base metal alloy bonding for: Resin bonded bridge Ortho bracket Composite resin facings
Resin bonded bridge Ni-Cr Ortho bracket S/steel, Co-Cr, Ti Composite resin facings Ni-Cr, Co-Cr, Co-Ni-Cr, Ti
27
What are the precious metal alloy bonding for: Intra-oral repair Adhesive FPD (bridge) Composite resin facings
Au and Pd alloys for all
28
What is the procedure for cementing resin bonded bridges?
Etching, gritblasting to create a roughened surface
29
What is the luting cement for bonding resin bonded bridges?
Dark cure resins and adhesive resins
30
What is the procedure for cementing precious metal bonding?
Tin plating Silica coating Metal primers
31
What is the luting cement for precious metal bonding?
Dark cure resins | Adhesive resins
32
How do you go about cementing Maryland (Adhesive bridge)
Conventiona; Bis-GMA type resins Chemical/dark cure e.g. Comspan Surfaces etched to increase the SA
33
What are the adhesive resin cements for resin-bonded bridge?
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
What are the properties of resin cements?
Strong Adhesive Technique sensitive chemical/dual/light cure
35
What are hydrophobic resins usually used for?
``` 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
What are hydrophilic resins used for?
High affinity to non-precious metals | Adhesive for metal bridges
37
What are the properties of hydrophilic resins
High cost Chemical or dual cure Highly oxygen inhibited e.g. panavia
38
What are self-etch resins used for?
All crown retained bridges and for provisional adhesive bridges
39
What are the properties of self-etch resins
Easy to use and clean up Strongly self-adhesive to dentine dual cure
40
What are the options for a silica coating for intra-oral repair?
Silicoater | Tribochemical coating - Rocatec and Cojet
41
How does Tribochemical coating work?
Advancing particle into the metal surface | Silicatise the surface at the point of contact - this improves the bond
42
What does the silica coating also need to bond the resin and metal together
Silane coupling agent
43
What is involved in the CoJet system?
CoJet material ESPE-Sil Visio-Bond Sinfony Opaquer (masks out the metal colour)
44
What are the step for using the CoJet system?
``` 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
What is the disadvantage of the CoJet system?
Doesn't last long, can drop off Many steps Technique sensitive
46
What is the advantage of the CoJet system?
don't need to cut the crown/bridge off | Effective in enhancing the bond strength to any alloy
47
What is the metal primer? | Why are they used?
Bifunctional monomer | They enhance the bond strength between precious metal alloys and resin
48
What are examples of resin-bonded ceramics?
Glass ceramics | Dentine bonded crowns
49
What is the procedure for cementing resin-bonded ceramics?
HF etch and silane
50
What is the luting cement for resin-bonded ceramics?
Aesthetic dual cure resin
51
What are the 2 phases pf glass ceramics?
Glass phase and crystalline phase
52
Why etch the glass ceramic first?
To dissolve the glass stage, cement infiltrates into the structure of the ceramic
53
What do dentine bonded crowns use?
Lithium disilicate
54
What is the bonding mechanism for resin-bonded cements/
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
Why do you get a higher strength bond using resin bonded cement compared to zinc phosphate or GIC?
Because it integrates into the material
56
What aesthetic resin luting cement is used for veneers?
Light activated - Porcelite
57
What aesthetic resin luting cements are used for ceramic crowns, onlays and inlays?
``` Dual cure Mirage FLC Nexus Calibra Variolink Rely-X ARC ```
58
Which restorations use resin-resin bond
Composite restorations Fibre re-inforced resin bridges Fibre reinforced endodontic posts
59
What are the luting cements for : Composite restorations Fibre re-inforced resin bridges Fibre reinforced endodontic posts
Aesthetic dual cure resins | Adhesive resins
60
Where (mainly) do we need the resin-resin bond?
Incremental build up of direct composites | Prefabricated resin composites: inlays, fibre reinforced bridges and endodontic posts
61
How are the resin composites first fabricated?
Grit blasting or grinding HF etching Silane coupling agent Tribochemical coating
62
What does loss or failure of the temporary restoration lead to?
Pain Overeruption and loss of space Drifting of proximal teeth Damage to core preparations
63
What are the functions of temporary cementation?
``` Provides a seal Prevent marginal leakage Prevent pulpal irritation Low strength to allow easy removal - want to remove whole protect preparation ```
64
What are the ideal properties of temporary cementation?
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
What materials are used for temporary cementation?
Fine particle zinc oxide eugenol cement e.g. Tempbond | Non-eugenol cements - TempbondNE - doesn't have problems with resin based materials
66
Which cements cant be used because the strength will be too high?
Zinc phosphate Zinc polycarboxylate GIC Difficult removal can damage the prep
67
What are the advantages of ZoE?
Easy removal enabling reuse of the restoration Acceptable sealing properties Obtundent effect on pulp Ease of use
68
What are the disadvantages of ZoE
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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