Effects of Different Re-Wetting Techniques on Dentin Shear Bond Strengths |
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| Authors: | ANDRÉ V RITTER DDS HARALD O HEYMANN DDS MED EDWARD J SWIFT JR DMD MS JORGE PERDIGÃO DMD MS PHD BRUNO T ROSA DDS MS |
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| Institution: | Auxiliary Professor, Department of Stomatology, Operative Dentistry Division, federal University of Santa Catarina, Florianopolis, 5C, Brazil;Resident, Department of Operative Dentistry and Dental Research Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;Professor and Chairman, Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;Professor and Graduate Program Director, Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;Associate Professor and Director, Division of Operative Dentistry, Department of Restorative Sciences, University of Minnesota, Minneapolis, Minnesota;Resident, Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina |
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| Abstract: | Purpose: For contemporary hydrophilic resin adhesive systems, bonding to dentin is improved if the substrate is maintained in a hydrated state following acid‐etching. The purpose of this study was to compare the dentin shear bond strengths of two single‐bottle adhesives (one acetone‐based and one ethanol‐based) applied under different etched‐dentin conditions: dry, wet, or dry and re‐wetted with different solutions. Materials and Methods: Bovine incisors (N = 120) were mounted in acrylic, polished to 600‐grit, and randomly assigned to 12 groups (n = 10). Dentin was etched for 15 seconds using 35% phosphoric acid, rinsed, and either blot‐dried, air‐dried, or air‐dried and re‐wetted with different solutions (distilled water, Gluma Desensitizer, Aqua‐Prep, and 5% glutaraldehyde in water). Two adhesives (Single Bond and Prime & Bond NT) were applied to each of the surface conditions following manufacturers' instructions. After adhesive application and curing, composite was applied in a No. 5 gelatin capsule and light‐cured. Specimens were loaded in shear, using an Instron at 5 mm per minute. Shear bond strengths were calculated by dividing the failure load by the bonded surface area. Data were subjected to analysis of variance (ANOVA) and a post hoc Tukey test. Results: Mean shear bond strengths ranged from 12.5 to 26.6 MPa for Single Bond and from 5.6 to 14.7 MPa for Prime & Bond NT. Significant differences were found in both groups of materials (p < .001). The three highest mean bond strengths were obtained (in order) on dentin that was re‐wetted with Gluma Desensitizer, re‐wetted with Aqua‐Prep, or never dried. Differences between these surface conditions were not statistically significant for either material. CLINICAL SIGNIFICANCE Different dentin surface conditions and re‐wetting techniques affected bond strengths for adhesives studied. Aqua‐Prep and Gluma Desensitizer can be successfully used as re‐wetting agents. The use of a re‐wetting agent may be beneficial when dentin is dried after acid‐etching and rinsing. |
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