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iodc > cementation > Flashcards

cementation Flashcards

1
Q

What is the classification of cements?

A

Liners and bases
Temporary cements
Permanent cements

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2
Q

What are liners and bases?

A

GIC eg. Fuji IX
RMGIC eg. Fuji II
Bulk fill, C factor reduction
Command set w light cure
Can etch for strong bond w dentine bonding agents
Can adhere to unetched hard tissue
Exhibit sustained fluoride release

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3
Q

What are temporary cements?

A

Between prep and definitive
Can be a week to several months (usually 2 weeks)
Can be used to assess pulpal health, gingival healing, implant integration, aesthetics and functional change evaluation

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4
Q

What can loss or failure of the temp lead to?

A

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

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5
Q

What are the functions of temporary cement?

A

Provide a seal
Prevent marginal leakage
Prevent pulpal irritation
Low strength for easy removal
Protect prep

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6
Q

What are the ideal properties of temp cement?

A

Seal against leakage of oral fluids
Low solubility
Biocompatible
Chem compatibility w polymer
Ease of use/removal
Easy to eliminate excess
Adequate working/setting time
Compatible w definitive luting agent

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7
Q

What materials are used for temp cement?

A

Fine particle ZOE (Tempbond- Kerr)
Non Euganol (Tempbond NE- Kerr)

Also, Zinc phosphate, zinc polycarboxylate and GIC
But, these are too high strength so difficult removal and prep damage

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8
Q

What are the advantages of ZOE?

A

Easy removal/use
Acceptable sealing properties
Obtundent effect on pulp

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9
Q

What are disadvantages of ZOE?

A

Eugenol+resin=bad combo

Eugenol acts as plasticiser of methacrylate and reduces surface hardness and strength
Can interfere w bond strength of cements
Inhibits polymerisation of certain composites

Must ensure all cement removed before definitive

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10
Q

What is the ideal permanent cement?

A

Adequate working time with rapid set
Low film thickness
Low solubility
High compressive and tensile strengths
Low viscosity
Adhesive
Biocompatible
Cariostatic
Translucent/opaque
Radiopaque

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11
Q

What are some historical permanent cements?

A

Zinc phosphate
Zinc polycarboxylate
Conventional GIC
Zinc oxide cements

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12
Q

What permanent cements are used?

A

RMGIC

Total etch adhesive resin cements (self cure, light cure, dual cure)

Self etching resin cements

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13
Q

What is RMGIC?

A

Hybrid of resin and GI components
Insoluble
Bonds to inorganic phase of dentine
Adheres to tooth structure/ceramic (not strong)
Used for metal-based
Contraindicated for ceramic due to hygroscopic expansion (leads to fracture)
Eg. Rely X luting

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14
Q

How does RMGIC work?

A

Contains
Acid soluble glass
Polyacid polymers (polyacrylic/itaconic/maleic)
Polymerising dimethacrylates

Polyacid polymers react w calcium in glass filler and dentine
Dimethacrylates polymerise into solid resin

Combines GI and resin tech

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15
Q

What is the composition and setting of RMGIC?

A

Powder (ion-leachable glass)

Liquid (methacrylate resin- bisGMA)
Acid-base and polymerisation reactions
HEMA allows resin and acid components to coexist in aqueous solution + take part in polymerisation
Water allows ionisation of acid component for acid-base reaction
Polymerisation activators and stabilisers

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16
Q

What are the advantages of RMGIC?

A

Adequate strength
Easy manipulation/use
Low film thickness
Fluoride release
Minimal post op sensitivity
Some adhesion to enamel and dentine
Resistance to moisture and marginal leakage

17
Q

What are the disadvantages of RMGIC?

A

Dehydration shrinkage due to GI component
Can occur after 3 months
Can create stress fracture and cement-tooth interface
HEMA- increased water sorption, so plasticity and hygroscopic expansion

Cement bulk v hard and difficult to remove

18
Q

What are total etch adhesive resin cements?

A

TOOTH
1. Pretreatment w 37% phosphoric acid
2. Dentine bonding agent application

CERAMIC
1. Etch w hydrofluoric acid for micromechanical retention

Resin cement + silane applied to crown

Only used w silica containing materials which etch w HF so not alumina or zirconia cores

Isolation is v essential

19
Q

What are total etch adhesive resin cements composed of?

A

Resin matrix of bisGMA or urethane dimethacrylate and filler of fine inorganic particles (20-80%) for thin film thickness

20
Q

What are the advantages of total etch adhesive resin cements?

A

Superior compressive and tensile strengths (20-50MPa)
Insoluble
Adhesive
Micromechanical bonding
Wide range of shades/translucencies

21
Q

What are the disadvantages of total etch adhesive resin cements?

A

Highly tech sensitive (reacts v badly w moisture)
High film thickness
Marginal leakage (p. shrinkage)
Severe pulp reactions w cut vital dentine
No fluoride release
Low modulus of elasticity
Difficult to remove excess hardened

22
Q

Why is a silane coupling agent needed?

A

Allows 2 materials to bond together

23
Q

What is a self cure resin cement?

A

Chemical reaction of 2 materials, don’t react to light
Useful when light doesn’t penetrate
Mostly used for Maryland wings, metal inlays/onlays, endo posts, thick restorations
Eg. Panavia 21

24
Q

What is a light cure resin cement?

A

Photoinitiators- need to be completely activated or can fail
Depth of at least 1.5mm
Lots of shade options- try in pastes
Eg. Calibra

25
Q

What is a dual cure resin cement?

A

Can cure w or w/o light
Enough self cure initiators w addition of light to help process and seal margins
Can be used for ANY metal free restoration
Eg. Panavia F 2.0

26
Q

What are self etching resin cements?

A

Don’t need etch or pre treatment
Comes in capsulated form
Can cement metallics, ceramic, PFMs BUT it’s important to remember that the prep and crown are perfect and you’re not relying on the cement
Eg. Rely X Unicem

27
Q

What is the bonding strength like for self etching resin cements?

A

Low bond strength
Bonding between resin cement + zirconia core is difficult due to chemical inertness and lack of silica content (can’t etch)

28
Q

What are the ideal cements for different materials?

A

Metal/metal or PFMs= Rely X luting (RMGIC)

High strength ceramic substructure- zirconia, alumina= Rely X Unicem

Glass-ceramic= Calibra (+ HF, silane primer, bonding agent)

iodc (63 decks)

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