Dentin-smear remains at self-etch adhesive interface
| Autor: | Kirsten Van Landuyt, Annelies Van Ende, Yasuhiro Yoshida, Hirofumi Yatani, Marcio Vivan Cardoso, Mariko Matsumoto, Jan De Munck, Bart Van Meerbeek, André Poitevin, Atsushi Mine, Takuo Kuboki |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Smear layer Dental Cements Chemical interaction Adhesion In Vitro Techniques Self etch adhesive medicine.anatomical_structure Microscopy Electron Transmission stomatognathic system Mechanics of Materials Transmission electron microscopy Dental Etching Dentin medicine Humans General Materials Science Adhesive Composite material General Dentistry Layer (electronics) |
| Zdroj: | Dental Materials. 30:1147-1153 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2014.07.006 |
| Popis: | Objective The bonding potential of ‘mild’ self-etch adhesives may be compromised due to smear interference, as they may not dissolve/penetrate the smear layer effectively due to their relatively low acidity. We observed that the thickness of the dentin smear layer differed depending on the surface-preparation methodology used. Methods The interaction of an (ultra-)mild self-etch adhesive (Clearfil S3 Bond, Kuraray Noritake) with human dentin, prepared either using a medium-grit diamond bur (‘thick’, clinically relevant smear layer) or 600-grit SiC-paper (‘thin’ smear layer), or just fractured (smear-free), was evaluated using high-resolution transmission electron microscopy (TEM). Non-demineralized/demineralized 30–100 nm interfacial cross-sections were prepared following common TEM-specimen processing and diamond-knife ultra-microtomy. Results The adhesive did not dissolve the bur-cut, nor the SiC-ground smear layer, but impregnated it. Within this ‘resin-smear complex’, hydroxyapatite was abundantly present. At fractured dentin, this complex was not present, while the actual layer of interaction of the adhesive was limited to about 100 nm. Non-demineralized ‘ultra-thin’ (30–50 nm) sections confirmed the interfacial ultra-structure to differ for the three surface-preparation methods. An electron dense band was consistently disclosed at the adhesive interface, most likely representing the documented chemical interaction of the functional monomer 10-MDP with Ca. Significance The dentin surface-preparation method significantly affects the nature of the smear layer and the interaction with the ultra-mild self-etch adhesive. |
| Databáze: | OpenAIRE |
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