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BDS3 DMS > Luting Agents > Flashcards

Luting Agents Flashcards

1
Q

what does the viscosity of a luting agent depend of

A

the size of the powder or filler particle in the material

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2
Q

what should the viscosity of a luting agent be

A

low to allow seating of the restoration without interference

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3
Q

why is it important for luting agents to be radiopaque

A

ceramic crowns are radiolucent which makes it easier to see marginal breakdown

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4
Q

what mechanical properties should a luting agent have

A

high compressive strength
high tensile strength
high hardness value

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5
Q

what are the two types of dental cement used for luting agents

A

zinc phosphate
zinc polycarboxylate

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6
Q

what are the two glass ionomer cements used for luting agents

A

conventional
resin modified

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7
Q

what reaction takes place in the zinc phosphate luting agents

A

acid-base reaction initially
then a hydration reaction

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8
Q

what is the powder aspect of zinc phosphate

A

zinc oxide
magnesium dioxide
alumina and silica

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9
Q

what is the liquid aspect of zinc phosphate

A

aqueous solution of phosphoric acid

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10
Q

what are some problems with zinc phosphate

A

low initial pH - pulpal irritation
exothermic setting reaction
not adhesive to tooth or restoration

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11
Q

what is the difference between zinc phosphate and zinc polycarboxylate cement

A

the phosphoric acid is replaced with polyacrylic acid

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12
Q

what is an advantage of zinc polycarboxylate cement

A

bonds to tooth surface in a similar way to glass ionomer cements

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13
Q

what are some problems with zinc polycarboxylate

A

difficult to mix
difficult to manipulate
soluble in oral environment at low pH
opaque

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14
Q

what is the reaction of glass ionomer cement

A

silica glass, aluminium oxide and calcium fluoride

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15
Q

what stages of reaction does glass ionomer go through

A

dissolution
gelation
hardening

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16
Q

how does glass ionomer bond to tooth surface

A

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

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17
Q

what are some advantages of glass ionomer cements

A

low shrinkage
long term stability
aesthetically better than zinc phosphate
fluoride release
cheap

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18
Q

what is the reaction of resin modified glass ionomer

A

light activation causes polymerisation of the HEMA and copolymers in the material leading to initial rapid set

19
Q

what does the secondary cure of RMGIC occur due to

A

a redox reaction

20
Q

what does the secondary cure redox reaction allow for

A

dark curing - where the material is not exposed to light but will still cure

21
Q

what does the incorporation of resin improve

A

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

22
Q

what are disadvantages of RMGIC

A

HEMA is cytotoxic
HEMA swells - cannot be used with porcelain
no bond to indirect restoration

23
Q

what must composite luting agents be used in conjunction with

A

suitable DBA

24
Q

what is the trouble that occurs when trying to bond to porcelain

A

porcelain is brittle and its surface is smooth and unretentive so it needs a surface wetting agent

25
Q

what surface wetting agent is used with porcelain

A

silane coupling agent
gamma-methacryoxypropyltrimothoxysilane

26
Q

what end of the silane coupling agent reacts with the composite luting resin

A

C-C double bond end

27
Q

what end of the silane coupling agent reacts with the composite luting resin

A

C-C double bond end

28
Q

what end of the silane coupling agent reacts with the porcelain

A

the oxide group side

29
Q

how can we bond luting agents to metal

A

the metal surface needs to be roughened by etching or sandblasting

30
Q

how does etching a metal’s surface occur

A

electrolytes etching removes the different phases of the alloy at different rates

31
Q

how would you bond to non-precious metal

A

4-META and MDP
acidic end of the molecule reacts with the metal oxide

32
Q

when bonding to metal why must you use a dual curing material

A

light will not penetrate the metal

33
Q

how do you bond to precious metal

A

the metal coupling agent is incorporated into the composite resin

34
Q

what is Panavia

A

a composite resin with metal coupling agent which is an anaerobic self cured material

35
Q

what indirect restoration can GIC be used to bond

A

MCC
metal posts
zirconia crowns
gold restorations

36
Q

what indirect restorations can light cure composite and DBA used to bond

A

veneers

37
Q

what indirect restorations can dual cure composite and DBA be used to bond

A

fibre post
composite inlay
porcelain inlays

38
Q

what indirect restoration can anaerobic cure composite be used to bond

A

adhesive bridge

39
Q

what are temporary cements

A

made to cement temporary restorations into place while permanent restoration is fabricated

40
Q

how are the temporary cements supplied

A

2 pastes

41
Q

what does the base of a temporary cement of

A

XnO, starch and mineral oil

42
Q

what are the two main types of temporary luting agents

A

with eugenol
withou

43
Q

when should eugenol containing cements not be used to cement the provisional restoration

A

when the permanent restoration will be cemented with a resin cement

44
Q

why should you not cement a temp with a eugenol containing material when the permanent will be cemented with a resin cement

A

any residual eugenol may interfere with the setting of the luting agent

BDS3 DMS (6 decks)

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