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FINALS > Cement Materials > Flashcards

Cement Materials Flashcards

1
Q

name three examples of luting agent material

A

zinc polycarboxylate
GIC/ RMGIC
composite resin luting agents

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2
Q

what is the ideal film thickness of a luting cement

A

25 micrometres

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3
Q

what are ideal properties of a dental luting cement

A

radiopaque
easy to mix
easy to use
film thickness 25 micrometres
low solubility
cariostatic
biocompatible

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4
Q

what must composite luting cements be used with

A

a suitable DBA

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5
Q

how is bonding to porcelain achieved

A

requires to be etched with hydrofluoric acid (sandblasted)
surface wetting agent - silane coupling agent
composite luting cement
DBA

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6
Q

what must be used when bonding a metal restoration to a tooth

A

dual cured material as light will not penetrate the metal

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7
Q

what is an example of a self adhesive composite resin

A

Panavia

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8
Q

what restorations can GIC be used to cement

A

MCC
metal post
zirconia crown
gold restoration

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9
Q

what restorations can a light cure composite and DBA be used to cement

A

veneer

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10
Q

what restorations can a dual cure composite and DBA be used to cement

A

fibre post
composite inlay
porcelain inlay

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11
Q

what can an anaerobic cure composite be used to cement

A

adhesive bridge

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12
Q

what dental material can be used as a temporary cement for restorations

A

zinc oxide
zinc oxide eugenol

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13
Q

why can eugenol containing materials not be used to cement the provisional restoration where the final cement will be resin

A

any residual eugenol will interfere with the setting of resin

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14
Q

name the five components of a dental ceramic

A

kaolin
quartz
feldspar
metal oxides
glass

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15
Q

what is the monomer in composite

A

BisGMA

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16
Q

what does the length of the monomer affect in composite

A

viscosity
polymerisation shrinkage

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17
Q

what does the filler particles in composite affect

A

wear resistance
polishability
aesthetics
compressive strength

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18
Q

what light wave is camphorquinone activated at

A

470 nm

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19
Q

what is unsupported enamel

A

enamel prisms that are sectioned/ cracked
bases that do not reach the EDJ

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20
Q

what does unsupported enamel in a cavity preparation cause

A

marginal failure

21
Q

what is the hybrid zone

A

zone of collagen penetration into dentine surface

22
Q

what is the smear layer

A

made up of contaminated dentine surface from the operator cutting the cavity

23
Q

how does GIC come packaged

A

powder - calcium fluoro-aluminosilicate
liquid - acid with water

24
Q

what are the three stages of GIC setting

A

dissolution
gelation and hardening
hydration

25
Q

name 3 uses of GIC

A

luting cements
direct restorations
indirect pulp protection (over a pulp cap)

26
Q

what is RMGIC

A

same as GIC but with the addition of HEMA

27
Q

what are uses of RMGIC

A

provisional restorations
base liner under composite restorations

28
Q

what is black’s cavity classification

A

I - posterior occlusal
II - posterior approximal involvement
III - anterior approximal
IV - anterior incisal edge
V - buccal cervical cavity

29
Q

name three indications for FS

A

high caries risk
deep fissures
newly erupting molar

30
Q

name an indication for PRR

A

evidence of enamel demineralisation in the fissure

31
Q

what is a nayyar core

A

rubber dam placed
access cavity
remove 2-4mm GP from canals
pack with amalgam using narrow smith plugger
back amalgam into remaining cavity

32
Q

what is an indication for a post

A

broken down root treated tooth with insufficient/ no ferrule

33
Q

what are the two broad classifications of permanent luting cements

A

water based
resin based

34
Q

what are examples of water based luting cements

A

GIC
RMGIC
zinc phosphate
zinc polycarboxylate

35
Q

what are examples of resin based luting cements

A

self adhesive and adhesive resins
dual cure/ self cure/ light cure

36
Q

what is zinc phosphate

A

water based cement
great mechanical retention but soluble in oral fluid
low pH (2) causes irritation to pulp

37
Q

what is zinc polycarboxylate

A

bonds to tooth surface but not restoration
difficult to mix and soluble in mouth at low pH

38
Q

what is GIC

A

bonds to tooth by Ca ion exchange and hydrogen bonding with collagen in dentine
no chemical bond to restoration

39
Q
A
40
Q
A
41
Q
A
41
Q

what is RMGIC

A

GIC with the addition of HEMA
shorter setting time and longer working time
cannot be used to cement ;porcelain restorations as HEMA swells and will cause porcelain to crack

42
Q

what must composite luting cements be used with

A

suitable DBA

43
Q

what does porcelain require when it is being cemented

A

silane coupling agent on the surface of porcelain rest

44
Q

what do metal restorations require

A

metal bonding agent as well as having the fitting surface sandblasted

45
Q

what is an example of a self adhesive composite resin

A

panavia

46
Q

what are the two types of temporary cements

A

zinc oxide
zinc oxide eugenol

47
Q

when can zinc oxide eugenol not be used as a temporary cement

A

when the definitive luting cement is resin based as left over eugenol can interfere with the setting

FINALS (25 decks)

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