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Dental Materials > Linings and bases > Flashcards

Linings and bases Flashcards

1
Q

what is the powder re. phosphoric acid based cements?

A

zinc oxide +other metallic oxides

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2
Q

what is the liquid re/ phosphoric acid based cements?

A

aqueous solution of phosphoric acid with buffers

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3
Q

Where does the setting reaction occur re. phosphoric acid based cements?

A

surface of powder

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4
Q

what kind of setting reaction happens re. phosphoric acid based cements?

A

rapid

exothermic

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5
Q

what is mixing technique re. phosphoric acids based cements?

A

cool glass slab

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6
Q

why always replace cap on liquid?

A

prevents crystalisation

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7
Q

what properties have phosphoric acid based cements?

A 
low ph and mw- highly irritant
thermal and electrical insulator
strength to withstand condensation
radiopaque
non obtundant
no adhesive- no coronal seal
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8
Q

what are variants of phosphoric based cements?

A

silicophosphate cements

copper cements

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9
Q

how is zinc oxide euganol set?

A

by chelation

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10
Q

what is powder re. zinc oxide euganol cements?

A

zinc oxide
hydrogenated resin/polystyrene
accelerator- zinc acetate

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11
Q

what is zinc oxide euganol incompatible with?

A

resin composites

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12
Q

what are properties of zinc oxide euganol cements?

A 
benficial irritancy- re reactionary dentine
bacteriocidal
insulator
withstands condensation
obtundant
non adhesive- no coronal seal
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13
Q

What is a derivative of z.o euganol?

A

ortho ethoxy benzoic- EBA cements

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14
Q

What are the two paste in calcium hydroxide cements?

A

1- glycol salicylate

2- zinc oxide with calcium hydroxide

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15
Q

what are properties of calcium hydroxide cements?

A

insufficient strength re. condensation
non adhesive
radiopaque
beneficial irritant

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16
Q

What is the powder re. polycarboxylate cements?

A

zinc oxide

17
Q

what is the liquid re. polycarboxylate cements?

A

polyacrylic acid aqeous solution

18
Q

what are poroperties of polycarboxylate cements?

A 
bond to stainless steel
mildy irritant
bacteriostatic
insulator
strength
adhesive
non obtudant
19
Q

what is GI & RMGIC?

A

vitrebond

20
Q

what is the powder re. GI?

A

ion leachable fluroaluminosilicate glass with photosensitiser

21
Q

what is the liquid re GI?

A

modified polyacrylic acid

22
Q

What is a composite bulk fill?

A

SDR- smart dentine replacement

23
Q

what are properties of SDR?

A

delayed/ reduced shrinkage
cure up to 4mm
no need for liner?

Dental Materials (13 decks)

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