Classification according to SL treatment

1. Modifying

1.1. Selective-etch

1.2. Enamel (Total-etch): ⇧Bonding

1.3. Dentin (Self-etch): ⇩Sensetivity

1.4. Adhesive is not well-agitated

1.5. SL is incorporated with bonding process

1.6. SL form a barrier over pulp and prevent outflow of pulpal fluid

1.7. Remove some of SL

1.8. Efficient wetting and in-situ polymerization in SL

1.9. No exposure of collagen fibrils

1.10. Mech.: Preserved (SL) & (SP)

2. Removing

2.1. Total-etch (E&R)

2.1.1. 3-step

2.1.1.1. air drying

2.1.2. 2-step

2.1.2.1. wet drying

2.2. Remove both SL & SP

2.3. Complete demineralization of SL & underlying dentin

2.4. Exposure of collagen fibrils

2.5. Strong acid (H₃PO₄)

2.6. H₂O rinse required

2.7. Mech.: Thick (HL) & Long (RT)

3. Dissolving

3.1. Self-etch

3.1.1. Subclassification according to PH:

3.1.1.1. Strong self-etch PH ≤1

3.1.1.1.1. not common

3.1.1.2. Moderate (intermediate) = 1-2

3.1.1.3. Mild = 2-2.5

3.1.1.4. Ultra mild > 2.5

3.1.1.4.1. w/ 1-step (all-in-one)

3.2. Remove SL only

3.3. Partial demineralization of SL & underlying dentin

3.4. Weak acid (biphosphonate)

3.5. No H₂O rinse

3.6. Mech.: Thin (HL) & Preserved (SP) & Short (RT)