DMS Flashcards by Aimee Nimmo

COMPONENTS OF COMPOSITE RESIN

glass filler particles 
resin 
camphorquinone 
low weight dimethacrylates 
silane coupling agents

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WHAT ARE GLASS FILLER PARTICLE EXAMPLES IN COMPOSITE

microfine silica
quartz
hard things

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WHAT IS THE RESIN PART OF COMPOSITE RESIN

bisGMA

soft

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

triethylene glycol dimethacrylate (TEGDMA)

adjusts viscosity / reactivity

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WHAT DOES THE SILANE COUPLING AGENT IN COMPOSITE DO

allows for intimate bonding between filler and resin

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WHAT IS THE SETTING REACTION OF COMPOSITE WE USE

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

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WHAT ARE THE TYPES OF COMPOSITE

conventional
hybrid
microfine

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USE OF COMPOSITE

direct filling material

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COMPONENTS OF GIC GLASS POWDER (BASE)

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

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COMPONENTS OF GIC LIQUID (ACID)

polyacrylic acid
tartaric acid
itaconic acid

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

translucency

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WHAT DOES TARTARIC ACID CONTROL

setting characteristics

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WHAT DOES ITACONIC ACID CONTROL IN GIC

viscosity

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WHAT ARE THE STAGES OF SETTING REACTION FOR GIC

dissolution
gelation
hardening

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WHAT HAPPENS IN DISSOLUTION OF GIC

glass dissolves in acid as H+ attacks

silica gel formed around unreacted glass

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WHAT HAPPENS IN THE GLATIUON STAGE OF GIC SETTING

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

WHAT HAPPENS IN THE HARDENING STAGE OF GIC SETTING

trivalent aluminium ions crosslink more polyacrylic acid chains = hard

USES OF GIC

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

WHICH MATERIALS ARE LIGHT CURE

composite and RMGI

COMPONENTS OF RMGI POWDER

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

COMPONENTS OF RMGI LIQUID

HEMA 
polyacrylic acid with methacrylate groups 
tartaric acid 
water
camphorquinone

RMGI DUAL CURE SETTING REACTION

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

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

RMGI TRI-CURE SETTING REACTION

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)

TYPES OF RMGI

fuji

vitrebond

USES OF RMGI

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

COMPONENTS OF CALCIUM HYDROXIDE PASTE 1 - BASE

calcium hydroxyide zinc oxide zinc stearate ethyl toluene sulphonamide

COMPONENTS OF CALCIUM HYDROXIDE PASTE 2 - THE CATALYST

glycol salicylate titanium dioxide calcium sulphate calcium tungstate

SETTING REACTION OF CALCIUM HYDROXIDE

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

HOW TO MIX CALCIUM HYDROXIDE

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

USES OF CACLIUM HYDROXIDE

cavity liner | direct pulp cap

USES OF ZOE

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

SETTING REACTION OF ZOE

acid base reaction | chelation of zinc oxide with eugenol = zinc eugenol matrix

PROBLEMS WITH LIGHT CURING

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

ADVANTAGES OF LIGHT CURE

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

DENTINE BONDING PROCESS

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

CONTENTS OF PRIME AND BOND

``` HEMA bisGMA - bound by an initiation reaction camphorqunione acetone ```

WHAT IS DOC

depth of cure | 80% hardness of surface

HOW THICK SHOULD A CAVITY LINER BE

0.5MM

ADVANTAGES OF A CAVITY LINER

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