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dental luting agents Flashcards

1
Q

3 luting agent type examples

A

dental cement
composite resin
GIC

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2
Q

give 5 good properties of a luting agent

A

low viscosity
radiopacity - to see marginal breakdown
marginal seal - ideal if bonds to tooth
biocompatible - non toxic, no heat on set
easy to use

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3
Q

ideal film thickness

A

as thin as possible - 25 microns or less

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4
Q

how can a luting agent be cariostatic

A

antibacterial
fluoride releasing

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5
Q

4 ideal mechanical properties of dental luting agent

A

high compressive strength
YM similar to tooth
high hardness
high tensile strength

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6
Q

two examples of dental cement

A

zinc phosphate
zinc polycarboxylate

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7
Q

what reactions take place when mixing the powder and liquid of zinc phosphate

A

initial acid base reaction

phosphoric acid and zinc oxide

followed by hydration reaction to produce crystallised phosphate matrix (hopiete)

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8
Q

benefits of zinc phosphate

A

cheap
easy to use

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9
Q

what component of zinc phosphate gives white colour

A

magnesium dioxide

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10
Q

what acid is used for zinc phosphate cement

A

50% phosphoric acid

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11
Q

function of aluminium oxide in zinc phosphate cement

A

prevents crystallisation leading to amorphous glassy matrix of acid salt surrounding unreacted ZnO

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12
Q

3 negatives of zinc phosphate cement

A

low initial pH - plural irritation
not adhesive to tooth
not cariostatic

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13
Q

what is the difference between zinc phosphate and zinc polycarboxylate

A

phosphoric acid is replaced by poly acrylic acid

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14
Q

3 advantages of zinc polycarboxylate

A

bonds to tooth
cheap
low pH but returns neutral more quickly than zinc phosphate

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15
Q

3 disadvantages of zinc polycarboxylate

A

difficult to mix
soluble in low pH
lower compressive strength than zinc

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16
Q

what is the difference between GI luting cement and GI filling material

A

particle size of glass - cement is less than 29 micrometers to allow suitable film thickeness

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17
Q

what type of reaction takes place in GI cement

A

acid base between acid and glass

acid - poly acid mixture of acrylic acid, maleic acid
glass - silicon dioxide and aluminium oxide

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18
Q

how does GI cement bond to tooth

A

ion exchange with Ca in enamel and dentine

H bonding with collagen in dentine

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19
Q

how does GI bond to the restoration

A

mechanical - sandblast restoration to allow mechanical adhesion

no chemical bond

20
Q

3 advantageous properties of GI cement

A

low shrinkage
self adhesive to tooth substance
fluoride release

21
Q

what does RMGIC contain that conventional GI does not

A

hydrophilic monomer HEMA

hydroxyethyl methacrylate

22
Q

how is HEMA polymerised in RMGIC

A

light activation

23
Q

incorporating resin into GIC to make RMGIC improves what properties

A

setting time is shorter
higher compressive and tensile strength
higher bond strength to tooth

24
Q

disadvantage of RMGIC

A

HEMA is cytotoxic - uncured monomer will damage pulp

no bond to indirect restoration

HEMA expands so shouldn’t be used to cement porcelain (crack) or posts (split root)

25
in dual cured composite, how much are physical properties reduced by in comparison to light cured
25%
26
benefits of composite luting agent
better physical properties better aesthetics lower solubility
27
between light cure and dual cure, which luting agent is suitable for an inlay
dual - light won't penetrate through the inlay
28
how does composite luting agent bond to an indirect composite inlay
micro mechanical to rough internal surface of inlay C=C bonds on fitting surface of inlay
29
how do you bond porcelain to composite resin luting agent
hydro fluoric acid surface wetting agent is required as not hydrophobic - silane coupling agent
30
give an example of silane coupling agent
gamma-methacryoxypropyltrimethoxysilane
31
how does silane coupling agent bond porcelain to composite luting agent
strong bond between oxide groups on the porcelain and silane C=C bond on silane reacts with composite resin luting agent
32
How are filler particles bonded to the resin matrix in composite resin filling materials
oxide groups on filler particles bond with the silane carbon to carbon double bond in silane reacts with the resin
33
How are filler particles bonded to the resin matrix in composite resin filling materials
oxide groups on filler particles bond with the silane C=C double bond in silane reacts with the resin
34
for tooth to be bonded to porcelain, what materials are needed in-between
tooth DBA composite luting agent silane porcelain
35
for a thin porcelain restoration, what composite luting agent should you use
light cure
36
how can you roughen a metal to bond to composite
sandblasting etch - cannot etch precious metals
37
for tooth to be bonded to non precious metal, what materials are needed in-between
tooth DBA composite luting resin metal bond agent non precious metal
38
what bonding agent is used when bonding non-precious metal to the luting agent
MDP or 4-META
39
how do MDP and 4-META bond to non metal and to luting agent
they have an acidic end of molecule which reacts with metal oxide C=C reacts with composite resin luting agent
40
2 examples of materials with carboxylic and phosphoric acid derived resin monomers
MDP 4-META
41
what composite luting agent would you use when bonding to metal
dual cure as light will not penetrate metal
42
what is a self adhesive composite resin
metal coupling agent is incorporated into composite resin e.g. panavia has MDP
43
cheat code
if unsure of what luting agent say dual cure composite with DBA as this does everything
44
how would you bond a precious metal
need to change the alloy composition - incorporate copper and heat to get oxide formation can tin plate it
45
what is present in temporary cements that stop it setting fully
carnauba wax - weakens structure
46
what are the two types of temporary cement
eugenol non-eugenol
47
when should eugenol temporary cement material not be used and why
when composite resin luting agent will be used to cement the definitive restoration as remaining eugenol will interfere with set

BDS3 DMS (8 decks)

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