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Intermediate Restorative Skills > Cementation > Flashcards

Cementation Flashcards

1
Q

What to consider with cementation?

A

Tooth-cement interface

Cement-restoration interface

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2
Q

Characteristics of the ideal 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 when required
Radiopaque
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3
Q

Types of acid/base cements?

A

Zinc phosphate
Zinc polycarboxylate
Glass ionomer
ZO cements

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4
Q

Types of resin modified cements?

A

Resin modified GIC

PA modified resins

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5
Q

Types of polymeric cements?

A

Hydrophobic resins
Hydrophilic resins
Self etching resins
Provisional cements

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6
Q

What luting agents are used for conventional cementation?

A 
Conventional cementation
Luting agent:
- Zinc cements
- Glass ionomer cements
- Resin modified glass ionomer cements
- Polyacid-modified resin composites
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7
Q

When to use conventional cementation?

A

Metal and metal ceramic restorations
Metal and ceramic endodontic posts
All-ceramic reinforced core ceramics

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8
Q

Zinc phosphate cement advantages?

A

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

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9
Q

Zinc phosphate cement disadvantages?

A 
Pulpal irritation due to low pH and exothermic rxns
No antibacterial action
Brittle and low tensile strength
No adhesive qualities
Soluble in oral environment
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10
Q

Zinc polycarboxylate cement advantages?

A 
Bond to enamel and dentine and some of the metallic cast restorations
Low irritancy
Antibac action
Low film thickness
F release
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11
Q

Zinc polycarboxylate cement disadvantages?

A

Properties dependent on handling procedures
Short working times and long setting times
Clean up is difficult
Timing critical
Strength and solubility are comparable to zinc phosphate cement
Some adhesion but less than GIC or resins

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12
Q

Types of glass ionomer cements?

A

Aqua-cem
Fugi1
Katac-cem
Glass ionomer type 1

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13
Q

Glass ionomer cements indications?

A 
20 yrs of success
F release
Bond to tooth
Low expansion/contraction\
Moderate strength
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14
Q

Glass ionomer cements problems?

A

Some post op sensitivity

Water sensitive during setting

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15
Q

When to use glass ionomer cements?

A

Good for routine use on crowns and bridges

Suggest the use of a preparation desensitise

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16
Q

Types of resin-modified glass ionomer cements (used today)?

A

Fugi PLUS
Rely X Luting (used in CCDH)
Protec-cem

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17
Q

Resin-modified glass ionomer cements indications?

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

Resin-modified glass ionomer cements problems?

A

Swelling

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19
Q

Resin-modified glass ionomer cements use?

A

Excellent for routine use on crowns and bridges

Contraindicated for most ceramics BUT very good for metal (PFM and gold crowns)

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20
Q

Polyacid-modified resin composites (compomer) strengths?

A

F release
Bond to tooth with pre-tx moderate - high strength
No post op sensitivity
Low solubility

21
Q

Polyacid-modified resin composites weaknesses?

A

Little long term experience

Swelling

22
Q

Polyacid-modified resin composites use?

A

Excellent for routine use on metal supported crowns and bridges, lab-made composites
Contraindicated for most ceramics
More modern materials now used

23
Q

What cementation to use for resin bonded bridges?

What luting agents are used for this?

A

Etching
Grittblasting
Luting agents - dark cure resins and adhesive resins

24
Q

Clinical applications of resin to metal bonding?

A 
Resin bonded bridge (adhesive bridge)
Ortho bracket 
Intra-oral repair
Fixed partial dentine
Composite resin facings
25
Q

Base metal alloy bonding?

A

Resin bonded bridge
Ortho bracket
Composite resin facings

26
Q

Precious metal alloy bonding?

A

Intra-oral repair
Adhesive bridge
Composite resin facings

27
Q

Resin/bonded bridge/maryland bridge materials?

A 
Conventional Bis-GMA type resins
Chemical/dark cure luting agents
Phosphonated resin - panavia 21
4-META based resin 
Self adhesive resin cements e.g. rely-x unicem
28
Q

Resin cements - features?

A

Strong
Adhesive
Technique sensitive (hydrophobic resins)
Available as chemical, dual or light cure

29
Q

Hydrophobic resins?

A 
For translucent ceramics
For adhesive bridges
Required bonding agents
Light cured or dual cure
Wide range of shades and opacities
E.g. calibra
30
Q

Hydrophilic resins?

A 
High affinity to non-precious metals
Mainly used for adhesive metal bridges
High cost
Chemical or dual cure
Highly oxygen inhibited
E.g. Panavia
31
Q

Self etch resins?

A 
Easy to use and clean up
Strongly self adhesive to dentine
Can be used for all crown retained bridges and for bonding provisional adhesive bridges
Dual cure
E.g. relyX unicem
32
Q

Silica coating types?

Precious metal bonding

A

Silicoater

Tribochemical coating - rocatec and cojet

33
Q

Cojet system materials?

A

Cojet material
ESPE-Sil
Visio-bond
Sinfony opaquer

34
Q

Steps to the cojet system - repairing exposed metal?

A 
Pretreat with cojet
Apply espe-sil (Silica)
cover exposed metal surfaces thinly with sinfony opaquer
Light cure 10 sec
Apply bonding agent, light cure 20 sec
Complete with LC-composite
Light cure
Finish as usual

cojet system embeds a ceramic layer on the metal surface, porcelain or cured composite, producing a stronger bond as it enables silane coupling.

35
Q

Conclusions of tribochemical coating?

A

Technique appears effective in enhancing the bond strength to any alloy
Many steps involved = technique sensitive

36
Q

Features of metal primers?

A

Simple to use

Significantly enhance bond strength between precious metal alloys and resin

37
Q

What procedure and luting agents are used for resin-bonded ceramic (dentine bonded crowns) restorations?

A

HF etch and silane

Luting agent - aesthetic dual care

38
Q

Glass-sinlane resin interface?

A

Sinica glass has OH groups and methacrylate groups
Bonds to get silicaoxide and methacrylate groups
With silane coupling agent it binds to OH groups

39
Q

Aesthetic resin luting agent types? Light activated and dual cure - uses?

A 
Light activated - porcelite - veneers
Dual cure:
- Mirage FLC
- Nexus
- Calibra
- Variolink
- Rely-X ARC 
= Ceramic crowns, onlays and inlays
40
Q

When is resin to resin bond use?

What luting agent is used?

A

Composite restorations
Fibre reinforced resin bridges
Fribre reinforced endodontic posts

Luting agent - aesthetic dual cure resins, adhesive resins

41
Q

Resin to resin bond: What occurs when incremental build ups of direct composites are done?

A

Oxygen inhibited surface layer of some 10-50um thick

42
Q

Resin to resin bond: What occurs with prefabricated resin composites?

A

Composite inlays, fibre reinforced bridges and endodontic posts

  • Grit blasting or grinding
  • HF etching
  • Silane coupling agent
  • Tribochemical coating
43
Q

What occurs when a temporary inlay, onlay, crowns and bridges are lost?

A

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

44
Q

Functions of temporary cement?

A 
Provide a seal
Prevent marginal leakage
Prevent pulpal irritation
Low strength to allow easy removal
Protect preparation
45
Q

Ideal properties of temporary cement?

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

46
Q

Temporary cement examples?

A

Fine particle zinc oxide eugenol
- Tempbond

Non-eugenol cements
- TempboneNE

Zinc phosphate, zinc polycarboxylate and GIC too high strength - difficult removal, damage to prep

47
Q

ZOE advantages?

A

Easy to remove = reuse of restoration
Acceptable sealing properties
Obtundent effect on pulp
Ease of use

48
Q

ZOE disadvantages?

A

Free eugenol acts as plasticizer of methacrylate resin and reduces surface hardness and strength
Eugenol can interfere with bond strength of resin cements
All cement removed before using a definitive resin cement
Eugenol free zinc oxid available e.g. Temp bond NE

Intermediate Restorative Skills (21 decks)

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