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3. Dental Materials > Linings and bases > Flashcards

Linings and bases Flashcards

1
Q

what do linings and bases protect the pulp from?

A

an overlying restorative material

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2
Q

phosphoric acid based cements are composed of a powder containing what?

A

zinc oxide and other metallic oxides

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3
Q

phosphoric acid based cements are composed of a liquid containing what?

A

aqueous phosphoric acid

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4
Q

is the setting reaction of phosphoric acid based cements endo or exothermic?

A

exothermic

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5
Q

how do you delay the set and increase the working time of phosphoric acid cement?

A

introduce the powder incrementally into the liquid

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6
Q

why is phosphoric acid based cements highly irritating to the pulp?

A

low pH
low molecular weight so can penetrate deep into tubules

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7
Q

positives of using phosphoric acid based cements 3

A

thermal and electrical insulator
strength to withstand condensation
radiopaque

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8
Q

silicophosphate cements contain a liquid of aqueous phosphoric acid and buffers. what does the powder contain?

A

zinc oxide and aluminosilicate glass

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9
Q

advantages of silicophosphate cements 3

A

great strength
less solubility
leach fluoride

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10
Q

copper cements contain a liquid of aqueous phosphoric acid and buffers. what does the powder contain?

A

zinc oxide and black copper oxide

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11
Q

zinc oxide eugenol cements are composed of a liquid containing what?

A

eugenol plus olive oil to control viscosity

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12
Q

zinc oxide eugenol cements are composed of a powder containing what?

A

zinc oxide
hydrogenated resin/polystyrene for reinforcement

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13
Q

positives of using zinc oxide eugenol cements

A

obtundant affect - soothing
bactericidal - zinc
thermal and electrical insulator
resin reinforcements can withstand condensation

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14
Q

when should you not use zinc oxide eugenol cements?

A

not compatible with resin composites

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15
Q

what are the two types of calcium hydroxide cement?

A

chemical activated
VLC - visible light cured activated

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16
Q

chemical activated calcium hydroxide cement consists of a 2 pastes containing what?

A

paste 1: glycol salicylate
paste 2: zinc oxide with calcium hydroxide

17
Q

what is the setting reaction for calcium hydroxide cements?

A

VLC activated polymerisation of methacrylate monomer
monomer mixed with hydroxyethylmethacrylate

18
Q

what increases the rate of set of calcium hydroxide cements?

A

moisture

19
Q

visible light cured materials are endo or exothermic?

A

exothermic

20
Q

positives of using calcium hydroxide cements

A

high pH so beneficial irritancy and bactericidal
thermal and electrical insulators
good restorative material compatibility

21
Q

negatives of using calcium hydroxide cements

A

insufficient strength to withstand amalgam condensation/packing
not adhesive so no coronal seal

22
Q

polycarboxylates consist of a powder and liquid containing what?

A

powder - zinc oxide (or freeze dried)
liquid - aqueous solution of polyacrylic acid

23
Q

polycarboxylates have a strong bond to ?, weak bond to ? and non existant bond to ?

A

gold
stainless steel
porcelain

24
Q

polycarboxylates are mildly irritant. why?

A

acidic but have a high molecular weight reducing penetration

25
Q

positives of polycarboxylates

A

fluoride renders them bacteriostatic
thermal and electrical insulator
strength for amalgam condensation
good restorative material combatibility
adhesive to coronal seal

26
Q

what does RMGIC stand for?

A

resin modified glass ionomer cement

27
Q

positives of glass ionomers

A

bacteriostatic due to fluoride release
thermal and electrical insulator
strength to withstand restoration placement
adhesive
good restorative materials compatibility

28
Q

what is composite bulk fill

A

flowable composite with delayed/reduced shrinkage
allows you to fill cavity in 4mm increments rather than 2mm like standard composite

29
Q

what does bulk dentine replacement biodentine consist of?

A

tricalcium silicate
calcium carbonate
zirconium oxide
water
super plasticising agent

30
Q

what does biodentine claim to do?

A

foster formation of reparative dentine

31
Q
A

3. Dental Materials (7 decks)

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