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Objective: The purpose of this study was to evaluate fluid movement across resin/dentin interfaces created by a current self-etching adhesive applied onto dentin with different prepared smear layer.
Materials and Methods: Dentin discs were prepared from extracted third molar and divided into 2 groups of smear layer-cover dentin discs created with either 360-grit silicon carbide paper or superfine grit diamond bur. For SEM investigation, smear layer free and smear layer covered specimens and smear layer free specimens by treating with 17% EDTA for 5 min were observed. For measurement of maximum permeability, fluid filtration rate of smear layer free specimens were measured under 20 cm H2O pressure. Then, smear layer was created with either silicon carbide paper or diamond bur and the fluid filtration rate was measured. The relative smear layer coverd dentin permeability (%P) was calculated. The smear layer covered specimens were further treated with a universal adhesive. The fluid infiltration rate and the relative bonded dentin permeability of bonded dentin were also measured and calculated.
Results: The results of SEM observation demonstrated 1-2 microns thick smear layer covered both dentin prepared with diamond bur and silicon carbide paper. There were no significant differences of maximum permeability, fluid infiltration rate of smear layer covered dentin and fluid infiltration rate of bonded dentin between specimens prepared with silicon carbide paper and diamond bur. The difference of %P of smear layer coverd dentin and %P of bonded dentin between dentin prepared with diamond bur and silicon carbide paper could not found. The application of the adhesive onto smear layer covered dentin could reduce the permeability.
Conclusions: In conclusion, the fluid movement across resin/dentin interfaces created by application of the universal adhesive was not interfered by different methods for creating smear layer.
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