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Dental Materials Science BDS3 > Luting Agents > Flashcards

Luting Agents Flashcards

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1
Q

what are the properties of a luting agent

A

viscosity and film thickness
easy of use
radiopaque
marginal seal
aesthetics
solubility
cariostatic
biocompatible
mechanical properties

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2
Q

what is viscosity and film thickness dependent on

A

size of powder or filler particles in material

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3
Q

what does the viscosity need to be to allow seating of restoration

A

low

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4
Q

what should the film thickness be

A

25um or less

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5
Q

ideally, what should the marginal seal be

A

the luting agent should bond chemically to the tooth and indirect restoration with a permanent and impenetrable bond

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6
Q

why is it important for a luting agent to be cariostatic

A

prevent secondary caries around crown margins

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7
Q

what are the mechanical properties of a luting agent

A

high compressive strength
high tensile strength
high hardness
youngs modulus similar to tooth

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8
Q

what are the main types of material used as luting agents

A

dental cement
glass ionomer cement
composite resin luting agents

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9
Q

what is the main type of dental cement

A

zinc phosphate

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10
Q

what is zinc phosphate made of

A

powder and liquid

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11
Q

what is the reaction of zinc phosphate

A

acid base
then hydration reaction producing crystalised phosphate matrix

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12
Q

what does aluminium oxide in zinc phosphate do

A

prevent crystallisation leading to an amorphous glassy matrix

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13
Q

what are the problems with zinc phosphate

A

low pH
exothermic setting reaction
not adhesive to tooth or restoration
not cariostatic
brittle
opaque

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14
Q

what is the difference between zinc phosphate and zinc polycarboxylate cement

A

phosphoric acid is replaced by polyacrylic acid
can bond to tooth
less heat reaction
pH returns to normal quicker

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15
Q

what are the problems with zinc polycarboxylate cement

A

difficult to mix and manipulate
soluble in oral environment at lower pH
opaque
lower compressive strength

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16
Q

what is the difference between glass ionomer and glass ionomer cement

A

cement particle size is smaller allowing for suitable film thickness

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17
Q

what is the setting reaction of glass ionomer cement

A

acid base
dissolution
gelation
hardening

18
Q

how does glass ionomer cement bond to the tooth

A

ion exchange with calcium in enamel and dentine
hydrogen bonding with collagen in dentine

19
Q

what are the advantages of glass ionomer cements

A

low shrinkage
long term stability
insoluble once fully set
aesthetically better than zinc phosphate
self adhesive to tooth substance
fluoride release
cheap

20
Q

what is the difference between RMGIC and RMGI

A

smaller particle size for film thickness

21
Q

what is the difference between RMGIC and GIC

A

addition of hydrophilic monomer HEMA

22
Q

what is the setting reaction of RMGIC

A

acid base
light activation for polymerisation of HEMA
REDOX reaction allowing dark curing

23
Q

what does the incorporation of resin allow for in RMGIC

A

shorter setting time
longer working time
higher compressive and tensile strengths
higher bond strength to tooth
decreased solubility

24
Q

what are the potential problems with RMGI

A

HEMA is cytotoxic
HEMA swells - cant be used with conventional porcelain crowns
no bond to indirect restoration

25
Q

what must composite luting agents be used with

A

DBA

26
Q

what bonding does composite luting agents experience

A

micromechanical bond to internal surface of inlay
chemical bond to remaining c=c bonds on fitting surface of inlay

27
Q

why does porcelain need to be bonded to tooth

A

it is brittle and needs to prevent fracture

28
Q

what is required to make porcelain compatible with composite resin luting agents

A

etch and surface wetting agent

29
Q

what surface wetting agent is used on porcelain

A

silane coupling agent

30
Q

what does the silane coupling agent do to porcelain

A

bonds to oxide groups on porcelain surface and to composite resin luting agent

31
Q

how is a metal surface roughened

A

etch
sandblasting

32
Q

what does sandblasting do to metal

A

roughen it but does not give undercut surface of etching

33
Q

what is used to bond to non-precious metal

A

materials with carboxylic and phosphoric acid derived resin monomers
MDP and 4META

34
Q

what happens when bonding to non-precious metal

A

acidic end of molecule reacts with metal oxide and makes it hydrophobic

35
Q

what sort of material is needed when bonding to metal

A

dual curing material

36
Q

what is a self adhesive coupling agent

A

metal coupling agent incorporated into composite resin
self curing material

37
Q

what types of restoration require GIC

A

MCC
metal post
zirconia crown
gold restoration

38
Q

what is a temporary cement

A

cement which holds temporary restorations in place while permanent restoration fabricated

39
Q

how is a temporary cement removable

A

it contains a wax which makes it easier to remove
can also add petroleum jelly in

40
Q

what are the 2 main types of temporary cement

A

with and without eugenol

41
Q

when would you not use a eugenol temporary cement and why

A

when the permanent cement is going to be a resin cement
it can interfere with the setting reaction

Dental Materials Science BDS3 (10 decks)

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