Cement Materials

Question 1

name three examples of luting agent material

Answer 1

zinc polycarboxylate
GIC/ RMGIC
composite resin luting agents

Question 2

what is the ideal film thickness of a luting cement

Answer 2

25 micrometres

Question 3

what are ideal properties of a dental luting cement

Answer 3

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

Question 4

what must composite luting cements be used with

Answer 4

a suitable DBA

Question 5

how is bonding to porcelain achieved

Answer 5

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

Question 6

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

Answer 6

dual cured material as light will not penetrate the metal

Question 7

what is an example of a self adhesive composite resin

Answer 7

Panavia

Question 8

what restorations can GIC be used to cement

Answer 8

MCC
metal post
zirconia crown
gold restoration

Question 9

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

Answer 9

veneer

Question 10

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

Answer 10

fibre post
composite inlay
porcelain inlay

Question 11

what can an anaerobic cure composite be used to cement

Answer 11

adhesive bridge

Question 12

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

Answer 12

zinc oxide
zinc oxide eugenol

Question 13

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

Answer 13

any residual eugenol will interfere with the setting of resin

Question 14

name the five components of a dental ceramic

Answer 14

kaolin
quartz
feldspar
metal oxides
glass

Question 15

what is the monomer in composite

Answer 15

BisGMA

Question 16

what does the length of the monomer affect in composite

Answer 16

viscosity
polymerisation shrinkage

Question 17

what does the filler particles in composite affect

Answer 17

wear resistance
polishability
aesthetics
compressive strength

Question 18

what light wave is camphorquinone activated at

Answer 18

470 nm

Question 19

what is unsupported enamel

Answer 19

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

Question 20

what does unsupported enamel in a cavity preparation cause

Answer 20

marginal failure

Question 21

what is the hybrid zone

Answer 21

zone of collagen penetration into dentine surface

Question 22

what is the smear layer

Answer 22

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

Question 23

how does GIC come packaged

Answer 23

powder - calcium fluoro-aluminosilicate
liquid - acid with water

Question 24

what are the three stages of GIC setting

Answer 24

dissolution
gelation and hardening
hydration

Question 25

name 3 uses of GIC

Answer 25

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

Question 26

what is RMGIC

Answer 26

same as GIC but with the addition of HEMA

Question 27

what are uses of RMGIC

Answer 27

provisional restorations base liner under composite restorations

Question 28

what is black's cavity classification

Answer 28

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

Question 29

name three indications for FS

Answer 29

high caries risk deep fissures newly erupting molar

Question 30

name an indication for PRR

Answer 30

evidence of enamel demineralisation in the fissure

Question 31

what is a nayyar core

Answer 31

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

Question 32

what is an indication for a post

Answer 32

broken down root treated tooth with insufficient/ no ferrule

Question 33

what are the two broad classifications of permanent luting cements

Answer 33

water based resin based

Question 34

what are examples of water based luting cements

Answer 34

GIC RMGIC zinc phosphate zinc polycarboxylate

Question 35

what are examples of resin based luting cements

Answer 35

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

Question 36

what is zinc phosphate

Answer 36

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

Question 37

what is zinc polycarboxylate

Answer 37

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

Question 38

what is GIC

Answer 38

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

Question 41

what is RMGIC

Answer 41

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

Question 42

what must composite luting cements be used with

Answer 42

suitable DBA

Question 43

what does porcelain require when it is being cemented

Answer 43

silane coupling agent on the surface of porcelain rest

Question 44

what do metal restorations require

Answer 44

metal bonding agent as well as having the fitting surface sandblasted

Question 45

what is an example of a self adhesive composite resin

Answer 45

panavia

Question 46

what are the two types of temporary cements

Answer 46

zinc oxide zinc oxide eugenol

Question 47

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

Answer 47

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