SEM observation of novel characteristic of the dentin bond interfaces of universal adhesives
| Autor: | Masashi Miyazaki, Eizo Hirokane, Mark A. Latta, Toshiki Takamizawa, Wayne W. Barkmeier, Arisa Imai, Akimasa Tsujimoto, Robert L. Erickson |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Smear layer Dental Cements 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Adhesives Tensile Strength Materials Testing Dentin medicine Animals General Materials Science Composite material Ion beam etching General Dentistry Dental Bonding 030206 dentistry 021001 nanoscience & nanotechnology Resin Cements Reaction layer medicine.anatomical_structure Chemical bond Mechanics of Materials Dentin-Bonding Agents Microscopy Electron Scanning Cattle Adhesive 0210 nano-technology Layer (electronics) |
| Zdroj: | Dental Materials. 35:1791-1804 |
| ISSN: | 0109-5641 |
| Popis: | Objective The aim of this study was to observe the resin/dentin interfaces of universal adhesives by using scanning electron microscopy (SEM), and to compare their morphologies with conventional etch & rinse (ER) and self-etch (SE) adhesive systems. Methods Two three-step and one two-step ER adhesives and two two-step and two single-step SE adhesives were used for comparison with seven universal adhesives in ER mode and SE mode, respectively. Bonded surfaces with bovine teeth were longitudinally sectioned and mirror-polished. Half of the samples were treated with HCl and NaOCl solutions. The interfaces were subjected to argon ion beam etching and then observed by scanning electron microscopy. Results The thickness of the adhesive layer (AL) of most of the seven universal adhesives and single-step SE adhesives was similar. Universal adhesives in SE mode formed a hybrid smear layer as a high-density zone between the AL and dentin. The thickness of the hybrid layer (HL) of the universal adhesives in ER mode was ∼1–2 μm, with a high-density zone (reaction layer [RL]) below the HL. Conclusion The morphological features of most universal adhesives in SE mode and single-step SE adhesives are similar. Although resin–dentin interfaces of universal adhesives in ER mode resemble those of ER adhesives, universal adhesives have a distinctive feature, an RL. Significance The RL might be a sign of chemical bonding even when using universal adhesives in ER mode. |
| Databáze: | OpenAIRE |
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