luting materials

Question 1

define luting materials

Answer 1

materials aimed to join a dental prosthesis/appliance to the tooth surface

Question 2

what are the two presentations of luting materials

Answer 2

Powder and liquid that requires mixing
Two pastes in a syringe with a mixing tip

Question 3

what is gettability

Answer 3

Better wettability = better spread along the surface

Question 4

how are cast alloys prepared for bonding

Answer 4

sandblasting

Question 5

how are silica based ceramics (lithium disilicate) prepared for bonding

Answer 5

hydrofluoric acid and silane

Question 6

how are zirconia ceramics prepared for bonding

Answer 6

sandblasting and zirconia specific primer

Question 7

what is the luting interface

Answer 7

space between the tooth and the restoration for the cement

Question 8

steps for cementing a crown

Answer 8

Place cement in crown ensuring no air bubbles

Seat on tooth with moderate finger pressure and evaluate 3 points on the margin

Pt bite down on cotton wool and re-evaluate 3 points on the margin

Remove excess cement

Question 9

what is a common reason for crowns/bridges to dislodge

Answer 9

Dissolution from saliva and erosion from brushing etc.

Question 10

how is dissolution from saliva and erosion from brushing etc. prevented in cement

Answer 10

Ensure cement layer is thin enough to avoid voids/gaps

Question 11

luting materials are classified based one what? 2

Answer 11

time - temporary/definitive
setting reaction

Question 12

what is the setting reaction for zinc phosphate cements?

Answer 12

acid base reaction

Question 13

what is the presentation of zinc phosphate cements?

Answer 13

liquid powder

Question 14

what do u use to mix zinc phosphate cement

Answer 14

glass slab as its exothermic reaction

Question 15

what is the working time of zinc phosphate cement

Answer 15

Long working time - 3-6mins

Question 16

what is a caution of using zinc phosphate cement

Answer 16

Can cause nerve death if too close to pulp

Question 17

why does zinc phosphate cement fail?

Answer 17

being dissolved

Question 18

what is zinc polycarboxylate cements setting reaction

Answer 18

acid base reaction

Question 19

does zinc phosphate cement bond to tooth?

Answer 19

no

Question 20

what is the presentation of zinc polycarboxylate cements

Answer 20

powder and liquid

Question 21

what is the working time for zinc polycarboxylate cement?

Answer 21

Short working time 30-40s - can increase by mixing on a refrigerated glass slab

Question 22

does zinc polycarboxylate bond to tooth?

Answer 22

yes

Question 23

what is the setting reaction of glass ionomer cement

Answer 23

acid base reaction

Question 24

what is the presentation of glass ionomer cement

Answer 24

Glass powder and polyacrylic acid

Question 25

does glass ionomer cement bond to tooth?

Answer 25

yes

Question 26

name a high viscosity glass ionomer cement

Answer 26

fuji pink/white

Question 27

classification of glass ionomer cements Type I: Type IIa: Type IIb: Type III:

Answer 27

Type I: luting crowns, bridges and ortho brackets Type IIa: aesthetic restorative cements Type IIb: reinforced restorative cements Type III: lining cements, base

Question 28

what is resin modified GI cements setting reaction

Answer 28

acid base reaction and polymerisation

Question 29

how is resin modified GI cements polymerised?

Answer 29

chemical or light cure or both - dual cure

Question 30

do RMGI cements bond to tooth

Answer 30

yes

Question 31

advantage of RMGI

Answer 31

release fluoride

Question 32

what is the setting reaction of resin cements?

Answer 32

polymerisation

Question 33

when are resin cements used?

Answer 33

restorations that are not mechanically retentive e.g. RRB

Question 34

how doe resin cement compare to composite?

Answer 34

Low viscosity version of composite

Question 35

what do resin cements require?

Answer 35

a bonding agent, etch and prep

Question 36

disadvantage of resin cements

Answer 36

Irritating to the pulp - apply liner if less that 0.5mm tooth structure

Question 37

what is zinc oxide eugenol cements setting reaction

Answer 37

acid base reaction

Question 38

ZOE interferes with what?

Answer 38

composite and resin cements

Question 39

if using ZOE cementas a temporary then try to use what materials?

Answer 39

composite or resin cement then it wont stick

Question 40

types of zinc oxide eugenol cement I - II - III - IV -

Answer 40

I - temporary cementation II - long term cementation of fixed prosthodontics III - temporary filing/thermal insulating bases IV - intermediate fillings - between a final crown and the tooth - similar to a core