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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
Base metal alloy bonding?
Resin bonded bridge Ortho bracket Composite resin facings
26
Precious metal alloy bonding?
Intra-oral repair Adhesive bridge Composite resin facings
27
Resin/bonded bridge/maryland bridge materials?
``` 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
Resin cements - features?
Strong Adhesive Technique sensitive (hydrophobic resins) Available as chemical, dual or light cure
29
Hydrophobic resins?
``` For translucent ceramics For adhesive bridges Required bonding agents Light cured or dual cure Wide range of shades and opacities E.g. calibra ```
30
Hydrophilic resins?
``` 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
Self etch resins?
``` 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
Silica coating types? | Precious metal bonding
Silicoater | Tribochemical coating - rocatec and cojet
33
Cojet system materials?
Cojet material ESPE-Sil Visio-bond Sinfony opaquer
34
Steps to the cojet system - repairing exposed metal?
``` 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
Conclusions of tribochemical coating?
Technique appears effective in enhancing the bond strength to any alloy Many steps involved = technique sensitive
36
Features of metal primers?
Simple to use | Significantly enhance bond strength between precious metal alloys and resin
37
What procedure and luting agents are used for resin-bonded ceramic (dentine bonded crowns) restorations?
HF etch and silane | Luting agent - aesthetic dual care
38
Glass-sinlane resin interface?
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
Aesthetic resin luting agent types? Light activated and dual cure - uses?
``` Light activated - porcelite - veneers Dual cure: - Mirage FLC - Nexus - Calibra - Variolink - Rely-X ARC = Ceramic crowns, onlays and inlays ```
40
When is resin to resin bond use? | What luting agent is used?
Composite restorations Fibre reinforced resin bridges Fribre reinforced endodontic posts Luting agent - aesthetic dual cure resins, adhesive resins
41
Resin to resin bond: What occurs when incremental build ups of direct composites are done?
Oxygen inhibited surface layer of some 10-50um thick
42
Resin to resin bond: What occurs with prefabricated resin composites?
Composite inlays, fibre reinforced bridges and endodontic posts - Grit blasting or grinding - HF etching - Silane coupling agent - Tribochemical coating
43
What occurs when a temporary inlay, onlay, crowns and bridges are lost?
Pain Over eruption and loss of space Drifting of proximal teeth Damage to core preparations
44
Functions of temporary cement?
``` Provide a seal Prevent marginal leakage Prevent pulpal irritation Low strength to allow easy removal Protect preparation ```
45
Ideal properties of temporary cement?
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
Temporary cement examples?
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
ZOE advantages?
Easy to remove = reuse of restoration Acceptable sealing properties Obtundent effect on pulp Ease of use
48
ZOE disadvantages?
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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