Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BDS3 DMS > dental luting agents > Flashcards

dental luting agents Flashcards

1
Q

3 luting agent type examples

A

dental cement
composite resin
GIC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

ideal film thickness

A

as thin as possible - 25 microns or less

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

how can a luting agent be cariostatic

A

antibacterial
fluoride releasing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

4 ideal mechanical properties of dental luting agent

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

two examples of dental cement

A

zinc phosphate
zinc polycarboxylate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

benefits of zinc phosphate

A

cheap
easy to use

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what component of zinc phosphate gives white colour

A

magnesium dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what acid is used for zinc phosphate cement

A

50% phosphoric acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

function of aluminium oxide in zinc phosphate cement

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

3 negatives of zinc phosphate cement

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is the difference between zinc phosphate and zinc polycarboxylate

A

phosphoric acid is replaced by poly acrylic acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

3 advantages of zinc polycarboxylate

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

3 disadvantages of zinc polycarboxylate

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

how does GI cement bond to tooth

A

ion exchange with Ca in enamel and dentine

H bonding with collagen in dentine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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
Q

in dual cured composite, how much are physical properties reduced by in comparison to light cured

A

25%

26
Q

benefits of composite luting agent

A

better physical properties

better aesthetics

lower solubility

27
Q

between light cure and dual cure, which luting agent is suitable for an inlay

A

dual - light won’t penetrate through the inlay

28
Q

how does composite luting agent bond to an indirect composite inlay

A

micro mechanical to rough internal surface of inlay

C=C bonds on fitting surface of inlay

29
Q

how do you bond porcelain to composite resin luting agent

A

hydro fluoric acid

surface wetting agent is required as not hydrophobic - silane coupling agent

30
Q

give an example of silane coupling agent

A

gamma-methacryoxypropyltrimethoxysilane

31
Q

how does silane coupling agent bond porcelain to composite luting agent

A

strong bond between oxide groups on the porcelain and silane

C=C bond on silane reacts with composite resin luting agent

32
Q

How are filler particles bonded to the resin matrix in composite resin filling materials

A

oxide groups on filler particles bond with the silane
carbon to carbon double bond in silane reacts with the resin

33
Q

How are filler particles bonded to the resin matrix in composite resin filling materials

A

oxide groups on filler particles bond with the silane
C=C double bond in silane reacts with the resin

34
Q

for tooth to be bonded to porcelain, what materials are needed in-between

A

tooth
DBA
composite luting agent
silane
porcelain

35
Q

for a thin porcelain restoration, what composite luting agent should you use

A

light cure

36
Q

how can you roughen a metal to bond to composite

A

sandblasting
etch - cannot etch precious metals

37
Q

for tooth to be bonded to non precious metal, what materials are needed in-between

A

tooth
DBA
composite luting resin
metal bond agent
non precious metal

38
Q

what bonding agent is used when bonding non-precious metal to the luting agent

A

MDP
or
4-META

39
Q

how do MDP and 4-META bond to non metal and to luting agent

A

they have an acidic end of molecule which reacts with metal oxide

C=C reacts with composite resin luting agent

40
Q

2 examples of materials with carboxylic and phosphoric acid derived resin monomers

A

MDP
4-META

41
Q

what composite luting agent would you use when bonding to metal

A

dual cure as light will not penetrate metal

42
Q

what is a self adhesive composite resin

A

metal coupling agent is incorporated into composite resin
e.g. panavia has MDP

43
Q

cheat code

A

if unsure of what luting agent say dual cure composite with DBA as this does everything

44
Q

how would you bond a precious metal

A

need to change the alloy composition - incorporate copper and heat to get oxide formation

can tin plate it

45
Q

what is present in temporary cements that stop it setting fully

A

carnauba wax - weakens structure

46
Q

what are the two types of temporary cement

A

eugenol
non-eugenol

47
Q

when should eugenol temporary cement material not be used and why

A

when composite resin luting agent will be used to cement the definitive restoration as remaining eugenol will interfere with set

BDS3 DMS (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions