Self etching
The primer etches itself into the dentin.
- missing steps: etching, rinsing, drying dentin with acid;
- primer has a low pH of 2 – therefore it dissolves smear layer and etches dentin;
- primer does not rinse;
- After complete drying, Bond is applied and polymerized.
High bond to enamel without the need to etch enamel is especially in two-step ones. With one-step ones, the bond is weaker. The disadvantage of this system is the unaesthetic edge. OHA (hydroxyapatite) crystals still remain on the enamel. In addition, we added a primer. OHA crystals with primer create a tiny cushion that stands out after applying the composite as a gap filled with primer.
After preparing the cavity, we use a hydrophilic primer to do etching and priming at the same time. All the porridge that remains after etching (i.e. decayed hydroxyapatite crystals, and collagen residues) is left there (it is such mud saturated with primer), it is blown out, bonded and illuminated.
- Self etch two-step two-bottle Contains self etch primer + bond (e.g. Adhese/Vivadent) – good bond but poor aesthetics (gap). For this system, the KI for III, IV, VI class.
- Self etch one-step two-bottle The contents of two vials are mixed before application, poor binding and aesthetics. Self etch one-step one-bottle
- For example, G-bond, basically the same as a one-step two-bottle bond.
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