adhesive system

Question 1

what is the appearance of smear layer, and where can it be

Answer 1

amorphous, irregular and granular appearance

can be superficial & loosely attached

Question 2

what is hybrid layer

Answer 2

resin interlocking in demineralised dentine surface

Question 3

what does dentin conditioner do

Answer 3

deminieralises dentine, exposes collagen fibril network w interfibrillar spaces

Question 4

what affects the adhesion between CR and dentine

Answer 4

1. smear layer
2. dentinal tubules being filled with dentinal fluid
3. dynamic structure
4. contains vital odontoblasts and processes of pulp
5. too close to the pulp, where chemicals for etching and bonding may irritate pulp

Question 5

Why is a good amount of water needed for adhesion of dentine

Answer 5

water keeps the collagen network plasticised, keeps it from collapsing so there is space for adhesive to penetrate, but cannot have too much water as it may compete with the primer and prevent hybridisation.

Question 6

What kind of primer are there

Answer 6

alcohol based to remove excess water( in a wet dentine situation)

water based primer( in a dry dentine situation)