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BDS3 DMS > 7 - Luting agents > Flashcards

7 - Luting agents Flashcards

1
Q

What are examples of luting agents?

A
  • dental cements
  • composite resin
  • self adhesive composite resin
  • surface modifying chemicals
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2
Q

Describe the ideal film thickness of a luting agent.

A
  • film thickness is dependant on the filler particle size
  • film thickness must be low to allow seating of the restoration without interference
  • ideally 25um or less
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3
Q

Describe the ideal viscosity of a luting agent.

A
  • low viscosity prevents interference with the seating o the restoration
  • the viscosity increases as the material sets, so restoration should be placed quickly and pressure maintained during set
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4
Q

Describe the ideal working time of a luting agent.

A

Long, to allow for seating of restoration

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5
Q

Describe the ideal setting time of a luting agent.

A

Short

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6
Q

How are luting agents mixed?

A
  • some are encapsulated
  • some use a clicker system
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7
Q

Describe the ideal radiopacity of a luting agent.

A
  • ideally radiopaque
  • some ceramic crowns are radiolucent so it make it easier to see the margin and any breakdown
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8
Q

Describe the ideal bond of a luting agent.

A
  • marginal seal ideally chemically bonds to both the tooth and the restoration
  • should be permanent and impenetrable
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9
Q

Describe the ideal aesthetics of a luting agent.

A
  • tooth coloured (prevents metal restoration shining through)
  • non staining (may shine through tooth)
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10
Q

Describe the ideal solubility of a luting agent.

A

LOW

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11
Q

Describe the cariostatic properties of a luting agent.

A
  • fluoride releasing
  • antibacterial
  • helps to prevent secondary caries in crown margins
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12
Q

Describe the ideal biocompatibility of a luting agent.

A
  • non toxic
  • not damaging to pulp, ie neutral pH and low heat release on setting
  • low thermal conductivity
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13
Q

Describe the ideal mechanical properties of a luting agent. (4)

A
  • high compressive strength
  • high tensile strength
  • high hardness value
  • similar Youngs modulus to tooth (15GPa)
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14
Q

Name a dental cement.

A
  • zinc phosphate
  • zinc polycarboxylate
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15
Q

What are the different types of GI cement?

A
  • conventional
  • resin modified
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16
Q

What are the different types of composite resin luting agent?

A
  • total etch for use with DBA
  • self etch
  • requires etch but has own bonding agent incorporated
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17
Q

Describe zinc phosphate cement.

A
  • dental cement
  • acid base reaction
  • powder and liquid
  • easy to use
  • cheap
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18
Q

What are the components of zinc phosphate? (3+3)

A

POWDER
- zinc oxide
- magnesium dioxide
- alumina and silica oxides

LIQUID
- phosphoric acid
- aluminium oxide
- zinc oxide

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19
Q

What are the components of zinc polycarboxylate?

A

POWDER
- zinc oxide
- magnesium dioxide
- alumina and silica oxides

LIQUID
- polyacrylic acid
- aluminium oxide
- zinc oxide

20
Q

What are the negatives associated with zinc phosphate cement?

A
  • low pH (2) which can cause pulpal irritation
  • exothermic setting reaction
  • not adhesive to tooth or restoration (acts like grout)
  • not cariostatic
  • final set 24hrs
  • brittle
21
Q

Describe zinc polycarboxylate cement.

A
  • dental cement
  • similar to zinc phosphate, phosphoric acid replaced by polyacrylic acid
  • bonds to tooth surfaces
  • less exothermic reaction
  • low pH is for less time, therefore less pulpal irritation
  • cheap
22
Q

What are the negatives associated with zinc polycarboxylate cement?

A
  • difficult to mix
  • difficult to manipulate (jelly like consistency)
  • soluble in oral environment
  • lower modulus and compressive strength than zinc phosphate
23
Q

Describe GI cement.

A
  • particle size smaller than that of the filling material
  • acid base reaction between glass and acid
  • same dissolution, gelation and hardening reaction
  • bonds to tooth via ion exchange from calcium and hydrogen bonding with collagen
  • no chemical bond to restoration
  • cheap
24
Q

Describe the physical properties of GI cement. (6)

A
  • low shrinkage
  • long term stability
  • relatively insoluble after set
  • aesthetic
  • self adhesive to tooth
  • fluoride release
25
Q

Describe RMGIC.

A
  • same acid base reaction as GIC
  • HEMA added to cause polymerisation resulting in rapid set
26
Q

How does RMGIC properties differ from GIC?

A

RMGIC has
- shorter setting time
- longer working time
- higher compressive and tensile strength
- higher bond strength to tooth
- decreased solubility

27
Q

What are the negatives associated with RMGIC?

A
  • HEMA is cytotoxic and can damage pulp
  • HEMA swells in a damp environment, can crack crowns or tooth (do not use to cement posts as may split root)
  • no bond to restoration
28
Q

Describe composite luting agents.

A
  • variant on filling material, with smaller filler particles
  • used in conjunction with DBA
  • light or dual cured
  • better physical properties but technique sensitive
  • can chemically bond to indirect composite restorations
29
Q

How do composite luting agents bond to porcelain restorations?

A
  • hydrofluoric acid (lab use) etches the surface of porcelain to allow for micro-mechanical bonds to form
  • wetting agent is required as composite luting agent and porcelain are not compatible (porcelain is hydrophilic and composite is hydrophobic)
30
Q

What is silane coupling agent?

A
  • applied to etched porcelain surface as a monolayer
  • very strong bond between oxide groups on porcelain surface and silane
  • other end of silane has C=C bond which bonds with composite
31
Q

How do you bond to an indirect metal restoration?

A
  • surface needs to be roughened by sandblasting for mechanical bond
  • bond strengthened by chemical bonding
  • requires dual curing as light does not penetrate metal
  • can be used to cement most indirect restoration including posts
32
Q

What material can be used to bond to a non-precious metal?

A

Materials with carboxylic or phosphoric acid derived resin monomers

33
Q

How do you bond to a precious metal?

A
  • change the alloy composition to allow oxide formation (eg increase copper)
  • tin plate
  • very technique sensitive
34
Q

Describe self adhesive composite resin.

A
  • metal coupling agent is incorporated
  • anaerobic self cured material
  • good film thickness
  • opaque (prevents shine through of metal)
  • moisture sensitive
35
Q

What type of dental cement should you use for a metal ceramic crown?

A

GIC

36
Q

What type of dental cement should you use for a metal post?

A

GIC

37
Q

What type of dental cement should you use for a fibre post?

A

Dual cure composite and DBA

38
Q

What type of dental cement should you use for a veneer?

A

Light cure composite and DBA

39
Q

What type of dental cement should you use for an adhesive bridge?

A

Anaerobic cure composite

40
Q

What type of dental cement should you use for a zirconia crown?

A

GIC

41
Q

What type of dental cement should you use for a composite inlay?

A

Dual cure composite and DBA

42
Q

What type of dental cement should you use for a porcelain inlay?

A

Dual cure composite and DBA

43
Q

What type of dental cement should you use for a gold restoration?

A

GIC

44
Q

What are temporary cements?

A
  • used to hold temporary restorations in place whilst a permanent one if constructed
  • soft for easy removal
  • prep must be physically retentive
45
Q

What are the components of temporary cement? (3+3)

A

BASE
- ZnO
- Starch
- mineral oil
ACCELERATOR
- resin
- eugenol
- carnauba wax (prevent set)

45
Q

When are eugenol temporary cements contraindicated?

A

When the permanent restoration contains resin

BDS3 DMS (9 decks)

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