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Objective: to evaluate the effect of modified smear layer using EDTA, NaOCl solutions with and without agitating application to solution on the bond strength of all-in-one adhesives to dentin.
Methods: One hundred and two non-carious third molar were cut perpendicular to the long axis at 2 mm. above CEJ. The standardized smear layer on dentin surface was created by polishing with 600-grit carbide paper. Then, all specimens were randomly divided to 6 groups: 1) Distilled water, 2) Distilled water with agitation, 3) 17% EDTA, 4) 17% EDTA with agitation, 5) 1% NaOCl, and 6) 1% NaOCl with agitation. 1 ml of each solution was applied on the dentin surface for 60 s. Smear layer characteristic was observed under SEM. Three all-in-one adhesives (SE-ONE;SE, G-ænial bond;GB, Optibond all-in-one;OP) were applied following the instructions. All specimens were restored with resin composite (Z250XT). The micro-tensile bond strength test and failure mode analysis were investigated.
Results: Modified smear layer using both solutions significantly increased the bond strength in some all-in-one adhesives (SE ,OP) with p < 0.05. Agitation application could produce significantly higher bond strength in GB and SE (p < 0.05). The clean dentin surface with some erosion and opening of dentinal tubules was found when modified with EDTA. While, NaOCl exhibited the reduction in smear layer thickness with dense and pack characteristic.
Conclusion: Modified smear layer with EDTA and NaOCl could gain the bond strength of some all-in-one adhesives (SE,OP). The agitation application to pretreated solutions improved the bonding performance of some all-in-one adhesives (SE, GB)
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