Cementation of adhesive restorations

Question 1

What is the first stage of RRB fit?

Answer 1

try in mouth to assess:

1. pontic
2. fit of metal retainer
3. occlusion

Question 2

once you have tried the bridge in, what is the next stage?

Answer 2

decontamination and removal of any glycoproteins and mucopolysaccharides from the fit surface
prepare the fit surface by sandblasting with 50mincrons alumina particles

Question 3

How shoul dyou prepare the tooth?

Answer 3

using an oil and fluoride free paste

Question 4

What are the stages of cementation using panavia?

Answer 4

1. Prepare tooth
2. if precious metal alloy, apply alloy primer to fit surface of metal
3. etch enamel with 40% phorphorc acid for 10 seconds and wash for 20 seconds
4. apply acidic A and B ED primer to enamel
5. air dry for 30 seconds

Question 5

What is the purpose of the ED primer?

Answer 5

it begins the set of the cement

Question 6

How is the resin lute activated?

Answer 6

chemically
light

2 ways

Question 7

How must the resin lute set?

Answer 7

in the abscence of oxygen

Question 8

What does the paste A resin lute cement have?

Answer 8

MDP: 10-methacryloxydecyl dihydrogen phosphate
Hydrophobic aromatic dimethacrylate
hydrophpbic aliphatic dimthacrylate
hydrophilic aliphatid dimethacrylate
sialanted silica filler
sialanted collloidal silica
camphoroquinone
catalysts
initiatiors

Question 9

What does the resin lute paste B have?

Answer 9

Hydrophibic aromatic dimethacrylate
hydrophobic aliphatic dimethacrylate
hydrophilic aliphatic dimethacrylate
silanated barium glass filler
catalysts
accelerators
pigments
sodi fluoride

Question 10

How lnog do you mix each paste a and B togther for?

Answer 10

20 seconds

Question 11

T/F Panavia provides a better bond to enamel than tp dentine? Why

Answer 11

T

because panavia bonds to the phosphate ions and enamel has more phosphate ions than dentine

Question 12

How can you allow panavia to set?

Answer 12

if allowing hr margins to chemically cure then apply oxyguard to margins and leave for 3 mins and resin will set anaerobically

if light cuuring then 20 s per surface each margin

Question 13

Should you polish the cement immediatly?

Answer 13

no

this will distub the rest of the bond forming

Question 14

What can we use to cement porcelain and compossite veneers?

Answer 14

Esthetic cement

Question 15

WHat are the advantages of esthetic cement?

Answer 15

avaibale in five ranges
comes with a try in gel in all the shades
light cured or dual cured
lutes ceramic and composite restorations

Question 16

How do you prepare the surface of the veneer before cementing?

Answer 16

apply K etchant gel
40% phosphoroc acid
5 seconds

Question 17

what should you apply to the veneer surface once it has ben etched?

Answer 17

silane which should then be lightly air dried

Question 18

What does the silane contain?

Answer 18

gamma methacyloxy propyl tri methoxy silane
and
MDP resin

Question 19

How do you prepare the tooth for esthetic cement?

Answer 19

apply 40% phosphoric acid to tooth for 10 seconds

and then place the ED primer (two bottles which have been mixed) on to the tooth for 30 seconds and then air dry

Question 20

What does liquid A of the ED primer contain?

Answer 20

HEMA
MDP
water
accelorator

Question 21

What does liquid B of the ED primer contain?

Answer 21

Methacrylate monomer
water
initiator
accelorator

Question 22

What is the purpose of MDP resin?

Answer 22

Enables resin to etch and penetrate and create a chemical bond wit calcium ion and HAP

Question 23

What does the clearfil esthetic lutin cement contain?

Answer 23

Paste A Paste B
Bis GMA Bis GMA
TEGMA TEGMA
MDP MDP
silanated glass filler silanated glass filler
colloidal silica colloidal silica
benzoyl peroxide
camphoroquinone

Question 24

How long should you light cure the esthetic cement?

Answer 24

40 seconds

Question 25

What can pa avian be used for?

Answer 25

Composite
Silicate ceramic
Metal oxide ceramics eg zirconia
Metal alloys inlcuding amalgam

Question 26

What is the structure of MDP?

Answer 26

1. Polymerisable moiety MDP end
2. Hydrophobic section
3. Hydrophilic moiety with phosphate group

Question 27

Which part of the MDP does most of the bonding tot enamel and dentine?

Answer 27

Hydrophilic end group since it dissociates in water and releases Hydrongen ions which etch and the remaining neg charge molecule forms the bond

Question 28

How does the MDP bond to HAP?

Answer 28

3 methods

1. Ionic bond: between one or two oxygen groups in MDP to Ca in HAP
2. Covalent bond from one O to the P in in HAP
3. Multilayered of MDP forming on HAP via the polymerisable layer end where there is layer of calcium and HAP

Question 29

What are the purposes of the fillers in panavia?

Answer 29

To add radiopacities

Question 30

What is the difference of panavia 21 and panavia f2?

Answer 30

It contains Camphoroquinone and sodium fluoride for F release as well as all the other components in panavia 21

Question 31

What are the various primers to be used with panavia?

Answer 31

ED primer: enamel and dentine
Alloy primer: metals and alloys
Clearfil Primer: for ceramic

Question 32

How does primer work ?

Answer 32

Forms a bond with enamel the same way as the MDP resin since it contains MDP and initiates setting of the panavia too since without panavia will only reach 50% polymerisation

Question 33

Which ceramics do not need to be etched when using Clearfil primer?

Answer 33

Zirconia and alumina based

Question 34

What are the properties of panavia

Answer 34

Radiopque due to barium
Heavily filled with particles fro, 40nm to 19 microns
Film thickness of around 24 mincrons due to size of the biggest filler
Leaches fluoride
Can be auto cure and light cure

Question 35

What are silane coupling agents?

Answer 35

Siloxane linkages form to the Si in ceramic
Cross linkage between coupling agents
Polymerisation between the resin and meathcrykate