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Fixed Pros > Luting Agents > Flashcards

Luting Agents Flashcards

1
Q

What are the different mechanisms of adhesion?

A
  • Mechanical
  • Physical
  • Chemical
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2
Q

What is the simplest form of adhesion?

A

Mechanical

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3
Q

Which adhesion is from interlocking of components?

A

Mechanical

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4
Q

Which adhesion involves 2 surfaces in close proximity?

A

Physical Adhesion

Through dipole-dipole interaction between polar molecules

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5
Q

What type of bonding is rapid, reversible and not suitable for permanent bonding?

A

Physical Adhesion

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6
Q

What happens with chemical adhesion?

A
  • Molecules dissociate after adsorption onto the surface and constituent component then bond themselves separately by covalent or ionic forces
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7
Q

Which adhesion involves the sharing of electrons between the 2 atoms?

A

Chemical Adhesion - which distinguishes it from physical adhesion

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8
Q

What are the different adhesion promotors?

A
  • Coupling agents
  • Primers
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9
Q

How do coupling agents differ from primers?

A
  • Coupling agents
    • Bonds to both materials involved
    • Silane
  • Primers
    • Modifies the surface of one of the two materials involved so a bond can be created
    • Rely-X Ceramic Primer
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10
Q

What is a material that fills the gap between the tooth and the indirect restoration and holds them together called?

A

Luting agent

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11
Q

What are some desired properties of luting agents?

A
  • Good working/setting properties (long working time, short setting time)
  • Adheres well to tooth and restoration
  • Good seal
  • Biocompatible
  • Good tensile and shear strength
  • Compressible
  • Low film thickness (25 microns or less)
  • Low viscosity/solubulity
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12
Q

What are the types of cements?

A
  • Provisional/temporary cement
  • Permanent cement
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13
Q

What are the zinc-oxide based, self cure provisional cements?

A
  • Tempbond
  • Tempbond NE
  • TempoCem
  • Tempocem NE
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14
Q

What are the resin based, dual cure provisional cements?

A
  • Tempbond Clear
  • Provilink
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15
Q

What type of paste is tempbond/tempbond NE?

A

Base & Catalyst

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16
Q

What are some characteristics of Eugenol?

A
  • Residual eugenol may inhibit the polymerization of resin material
  • Provides a “sedative” effect on pulp
  • May be used to provisionally cement
17
Q

What is the main reason to use Provilink - Tempbond Clear?

A

Resin based-dual cure

**Because the color is clear **

18
Q

Which permanent cements are acid-base reactions?

A
  • Phosphate
  • Phenolate
  • Polyacrylate
19
Q

What is the oldes cements still be used, from what date, and what film thickness?

A
  • Zinc Phosphate
  • 1878
  • < 25 microns
20
Q

What are the disadvantages of zinc phosphate cement?

A
  • Does not bond to tooth
  • Soluble in oral fluids
  • Opaque color
  • Very low pH
21
Q

What are some characteristics of polycarboxylate cement?

A
  • Zinc oxide + polyacrylic acid
  • 1968
  • Film thickness <25 microns
  • Adheres to stainless steel & tooth
  • Little pulpal irritation - large molecules can’t penetrate dentinal tubules
22
Q

What are the disadvantages of polycarboxylate cement?

A
  • Need to work fast - (30 secs) sudden rapid increase in viscosity
  • More difficult to remove than zinc phosphate
  • Not recommended for permanent, good for provisional cementing
23
Q

What are some characteristics of glass ionomers?

A
  • Glass powder, fluoride
  • Glass particles surrounded by silica gel with acid
  • Isolation essential for entire setting time
  • Protect with resin coat
24
Q

What are the Working Time, Mixing Time, and Setting Times for glass ionomer?

A
  • Working time - 2-3.5 min
  • Mixing time - 10-30 sec
  • Setting time - 6-9 min
25
Q

With glass ionomers, what are some post-cementation sensitivity caused by?

A
  • Contamination of unset cement with water
  • Hydraulic pressure forcing acid into tubules
  • Desiccation of dentin prior to cementation
  • Incorrect powder/liquid ratio or mixing technique
26
Q

What are some characteristics of resin-modified glass ionomer cements?

A
  • Acid/base reaction
  • Film thickness - 3-25 microns
  • Releases fluoride (less than GI)
  • Low irritation
  • Not good for all ceramic restorations and posts, possible fracture
27
Q

What are the resin cements (non-acids)?

A
  • Nexus - dual cure
  • Rely X-VC - light cure
  • Panavia 21 - self cure
28
Q

What are some characteristics of resin cements?

A
  • Must be used with bonding system
  • Must be aware of working times & film thickness
29
Q

What are the different film thicknesses of resin cements: Light cure, Dual cure, Self cure?

A
  • Light cure - 5-22 microns
  • Dual cure - 13-48 microns
  • Self cure - 19-50 microns
30
Q

What are the uses of light cure cements?

A
  • Metal free restorations < 1.5mm thick
  • Metal free ortho retainers
  • Metal free perio splints
31
Q

What are some uses of dual cure resin cements?

A
  • Metal free:
    • Inlays
    • Onlays
    • Crowns
    • Bridges
  • Any application that a curing light might reach, but you want some added assurance that the cement will cure
32
Q

What are the uses of self-cure resin cements?

A
  • Metal based inlays/onlays
  • Ceramometal crowns and bridges
  • Full metal crowns/bridges
  • Endodontic posts
  • Metal based resin bonded bridges
  • Bonded amalgams
33
Q

What are some important properties & components to consider when selecting a luting agent?

A
  • Radiopacity
  • Consistency
  • Handling
  • Film thickness
  • Strength and wear resistance
  • Working time and setting times
  • Shades
34
Q

What are the steps for cementing a crown?

A
  • Clean restoration, sand blast
  • Isolate quadrant
  • Clean prep - pumice, rinse, dry
  • Mix cement and place in restoration
  • Seat crown, have pt bite on plastic or orange wood stick
  • Remove excess cement
  • Verify occlusion/proximal contacts

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