Adhesives

Question 1

Why is dentin harder to bind to?

Answer 1

Smear layer created during prep which interferes with bonding.

Etching is done to remove the smear layer.

Question 2

What are the four traditional steps for dentin bonding?

Answer 2

1. Etch: phosphoric acid used to take away smear layer
2. Prime: hydrophilic monomer to help stabilize collagen fibers
3. Adhesive: apply adhesive
4. Restoration: apply composite

Question 3

Modern steps for dentin bonding?

Answer 3

Most combine etchant and primer. (Two step)

Some combine etchant, primer, and adhesive. (One Step)

All based on methacrylate monomers