Principles of Adhesion

Question 1

what do adhesive materials offer potential to

Answer 1

seal vulnerable pits and fissures
conserve tooth tissue
reduce/elim micro leakage

Question 2

what are the 3 methods of achieving adhesion

Answer 2

micro mechanical
hem adhesion to enamel/dentine
complex (west, pen and bond)

Question 3

what are a means of micro mechanical attachments

Answer 3

acid etch

apply resins

Question 4

what are the means of chemical adhesion to enamel/dentine

Answer 4

coupling agents/cements contain polyacids

Question 5

what is a means of ‘couplex’ attachment

Answer 5

modern dentine bonding agents

Question 6

attraction between adhesive and adherend lowers what

Answer 6

surface tension of adhesive so will flow into irregularities

Question 7

what is the use of acid etch essential

Answer 7

applying acid gel

Question 8

what does acid etch do

Answer 8

selective decalcification of enamel prisms
micromech tags which bonding resin may flow
20-25 MPa

Question 9

what does acid etch do to the surface

Answer 9

increases roughness

increase enamel surface energy

Question 10

what does an increaein enamel energy do

Answer 10

remove surface contaminate
good wetting
facilitates micro mechanical tetention

Question 11

what are factors affecting acid etch

Answer 11

etching time
washing
drying

Question 12

what does etching tim eeffect

Answer 12

enough to work

not too long as allows prep of calcium nd phosphate

Question 13

what does waking and drying do to acid etch

Answer 13

wash - approx 60s to remove debris

dry - enable hydrophobic resin to penetrate and attach

Question 14

what is adhesion to dentine like

Answer 14

evolving

stick to same manu

Question 15

what are the properties of the ideal dental adhesive

Answer 15

high bond strength to enamel and dentine 
immediate and durable bon 
reliable bond 
prevent bac ingress
be safe to use
be simple to use

Question 16

what are the problems associated with boding to dentine

Answer 16

hydrophilic
vital tissue
inorganic and organic material
covers by smear layer

Question 17

what does cavity prep result in

Answer 17

a smear layer that occludes tubules

Question 18

what are primers

Answer 18

dentine conditioners
acids
alter surface appearance and characteristics of dentine

Question 19

what are coupling agents

Answer 19

primers

components that do sticking

Question 20

what are sealers

Answer 20

flow into dentinal tubules
seal dentine with surface layer rich in methacrylate
ensures bonding to resin

Question 21

what are some examples of primers (dentine conditioners)

Answer 21

malice
oxalic
phosphoric
nitric acids

Question 22

what essentially happens with a primer (dentine conditioner)

Answer 22

acid base reaction with hydroxyapatite
open dentinal tubules
demineralise surface dentine to depth 4 microns

Question 23

what essentially happens with coupling agents (Primers)

Answer 23

act a adhesive
bond to hydrophobic composites to hydrophilic dentine
formula - MRX dissolved in volatile solvent
HEMA popular

Question 24

is there time dept degeneration

Answer 24

acid open tubules risk nano leakage

• dentine etch greater than resin can penetrate
• dentine microstructure disruption and fail

Question 25

what is approach one of presentation

Answer 25

apply etchant, wash off = demin of dentine layer

apply primer and sealer in single solution

Question 26

what is an example of approach one

Answer 26

one step
scotch bond one
optioned solo

Question 27

what is an example of approach two

Answer 27

apply self etching primer

apply sealer in single solution

Question 28

what is an example of approach two material

Answer 28

clear fill liner bond 2V

Question 29

what is the single stage

Answer 29

self etching primer and sealer applied as single solution