Hence it becomes necessary to acid etch the dentin to remove the smear layer and smear plug.
The bonding mechanism of self-etching primers is based on this simultaneously etching and priming enamel and dentin without rinsing, forming a continuum in the substrate and incorporating smear plugs into the resin tags.
lie at a depth of 1-10 [micro]m and are located adjacent to the smear layer.
The smear layer penetrates into the dentin tubules to form smear plugs, and thus reduces dentin permeability to 86% .
In contrast, self-etch adhesives are not efficient enough to dissolve the smear plugs, and therefore remain in dentinal tubules as a part of a hybrid complex.
Mild self-etch adhesives can hardly form resin tags, they mostly demineralize smear plugs slightly and subsequently infiltrate this area with the resin.
The acidic primers used hybridized smear plugs instead of removing them, sealing the dentinal tubules.
Dentine sealing provided by smear layer/ smear plugs vs.
1--presence of smear layer or smear plugs in dentinal tubules;
This combination has proved to remove debris, smear layer and smear plugs more efficiently than sodium hypochlorite alone.
15 In this study the speci-mens irrigated with EDTA alone showed (grade 2) partial removal of smear layer with occluding smear plugs
as it has the capacity to dissolve inorganic components of smear layer only (Fig 4).