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OSCE > DMS > Flashcards

DMS Flashcards

1
Q

COMPONENTS OF COMPOSITE RESIN

A 
glass filler particles 
resin 
camphorquinone 
low weight dimethacrylates 
silane coupling agents
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2
Q

WHAT ARE GLASS FILLER PARTICLE EXAMPLES IN COMPOSITE

A

microfine silica
quartz
hard things

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3
Q

WHAT IS THE RESIN PART OF COMPOSITE RESIN

A

bisGMA

soft

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4
Q

WHAT IS THE LOW WEIGHT DIMETHACRYLATE IN COMPOSITE AND WHAT DOES IT DO

A

triethylene glycol dimethacrylate (TEGDMA)

adjusts viscosity / reactivity

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5
Q

WHAT DOES THE SILANE COUPLING AGENT IN COMPOSITE DO

A

allows for intimate bonding between filler and resin

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6
Q

WHAT IS THE SETTING REACTION OF COMPOSITE WE USE

A

light cure - 1 paste, blue light 440nm activates camphorquinone
= free radicals by breaking C=C bonds
= polymerisation reaction

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7
Q

WHAT ARE THE TYPES OF COMPOSITE

A

conventional
hybrid
microfine

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8
Q

USE OF COMPOSITE

A

direct filling material

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9
Q

COMPONENTS OF GIC GLASS POWDER (BASE)

A

silica
alumina
various salts : calcium fluoride / aluminium fluoride / aluminium phosphate

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10
Q

COMPONENTS OF GIC LIQUID (ACID)

A

polyacrylic acid
tartaric acid
itaconic acid

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11
Q

WHAT DOES THE RATIO OF ALUMINA TO SILICA IN GIC POWER ALTER

A

translucency

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12
Q

WHAT DOES TARTARIC ACID CONTROL

A

setting characteristics

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13
Q

WHAT DOES ITACONIC ACID CONTROL IN GIC

A

viscosity

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14
Q

WHAT ARE THE STAGES OF SETTING REACTION FOR GIC

A

dissolution
gelation
hardening

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15
Q

WHAT HAPPENS IN DISSOLUTION OF GIC

A

glass dissolves in acid as H+ attacks

silica gel formed around unreacted glass

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16
Q

WHAT HAPPENS IN THE GLATIUON STAGE OF GIC SETTING

A

this is setting in the mouth
the calcium crosslinks polyacrylic acid chains by chelating with its H+ ions
protect from moisture
takes minutes

17
Q

WHAT HAPPENS IN THE HARDENING STAGE OF GIC SETTING

A

trivalent aluminium ions crosslink more polyacrylic acid chains = hard

18
Q

USES OF GIC

A 
restorative material 
core build up before crown 
lining under fillings 
luting - Fuji 
fissure sealants 
endo cavity temp rest 
ortho cement
19
Q

WHICH MATERIALS ARE LIGHT CURE

A

composite and RMGI

20
Q

COMPONENTS OF RMGI POWDER

A 
fluro-alumino silicate glass 
barium glass 
vacuum dried polyacrylic acid 
potassium persulphate 
ascorbic acid 
pigments
21
Q

COMPONENTS OF RMGI LIQUID

A 
HEMA 
polyacrylic acid with methacrylate groups 
tartaric acid 
water
camphorquinone
22
Q

RMGI DUAL CURE SETTING REACTION

A 
camphorquinone and blue light 
=polymerisation 
= free radical methacrylate reaction 
= forms resin matrix 
(initial set)

acid base reaction happens the same as GIC (24 hours)

23
Q

RMGI TRI-CURE SETTING REACTION

A 
camphorquinone and blue light 
=polymerisation 
= free radical methacrylate reaction 
= forms resin matrix 
(initial set)

acid base reaction happens the same as GIC (24 hours)

PLUS
REDOX reaction ‘dark cure’ (5 mins)

24
Q

TYPES OF RMGI

A

fuji

vitrebond

25
Q

USES OF RMGI

A 
dressings 
fissure sealants 
endo access cavity temp fillings 
luting 
ortho cement 
restorations 
base/lining - vitrebond
26
Q

COMPONENTS OF CALCIUM HYDROXIDE PASTE 1 - BASE

A

calcium hydroxyide
zinc oxide
zinc stearate
ethyl toluene sulphonamide

27
Q

COMPONENTS OF CALCIUM HYDROXIDE PASTE 2 - THE CATALYST

A

glycol salicylate
titanium dioxide
calcium sulphate
calcium tungstate

28
Q

SETTING REACTION OF CALCIUM HYDROXIDE

A

acid base reaction

chelation reaction between zinc oxide and the glycol disalicylate makes a cement with pH 12

29
Q

HOW TO MIX CALCIUM HYDROXIDE

A

pea size of base and catalyst pastes
mix until uniform colour
wipe spatula clean

30
Q

USES OF CACLIUM HYDROXIDE

A

cavity liner

direct pulp cap

31
Q

USES OF ZOE

A

cavity liner / base in deep cavities under amalgam
temp restorations
root canal sealer
periodontal dressings

32
Q

SETTING REACTION OF ZOE

A

acid base reaction

chelation of zinc oxide with eugenol = zinc eugenol matrix

33
Q

PROBLEMS WITH LIGHT CURING

A

safety - exothermic reaction could damage pulp
thermal trauma to soft tissues if optic rod not placed correctly
ocular damage to operator
bad set in larger increments than DOC

34
Q

ADVANTAGES OF LIGHT CURE

A 
extended working time 
restoration doesn't require finishing
demand cure 
less waste 
1 paste = less porous / higher filler
35
Q

DENTINE BONDING PROCESS

A

etch = remove smear and expose dentinal tubules, increased wetability
prime and bond = primes hydrophilic end - binds to hydrophilic dentinal tubules and the hydrophobic methacrylate binds to the hydrophobic adhesive

36
Q

CONTENTS OF PRIME AND BOND

A 
HEMA 
bisGMA 
- bound by an initiation reaction 
camphorqunione 
acetone
37
Q

WHAT IS DOC

A

depth of cure

80% hardness of surface

38
Q

HOW THICK SHOULD A CAVITY LINER BE

A

0.5MM

39
Q

ADVANTAGES OF A CAVITY LINER

A

protect pulp from heat and chemicals
improve bond in adhesive restorations
antibacterial
palliate - reduce px symptoms

OSCE (14 decks)

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