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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/46694

Title: Submicron-to-nanoscale structure characterization and organization of crystals in dentin bioapatites
Authors: Toledano Pérez, Manuel
Aguilera, Fátima
Osorio Ruiz, Estrella
López-López, Modesto T.
Cabello Malagón, Inmaculada
Toledano-Osorio, Manuel
Osorio Ruiz, Raquel
Issue Date: 9-May-2016
Abstract: The aim of this research was to ascertain the crystal morphology, and to assess the ultrastructure and texture changes of sound (SD) and caries-affected dentin (CAD) after being restored with Zn-free and Zn-containing amalgam. Dentin surfaces were studied by X-ray diffraction (μXRD2), and Transmission Electron Microscopy (TEM) through selected area diffraction (SAED) and bright-field (BF) imaging. Crystals, at the dentin surface, were identified as hydroxyl-apatite with augmented crystallographic maturity, crystallite and grain sizes, and lower microstrain, in CAD dentin after Zn-containing amalgam removal, at 310 plane. This group, at this reflection, achieved lower microstrain than before amalgam placement. Opposed trend was followed at 002 reflection. Texture increased in CAD at both reflections, after the removal of Zn-containing amalgams. Crystallinity increased in SD after amalgam restorations at 002 and 310 reflections. In CAD, crystallinity decreased after amalgam restorations at 002 plane. Block-like and needle-like apatite crystals constituted the bulk of minerals in SD. Needle-like apatite crystals were observed, in CAD surfaces, before and after Zn-free amalgam restorations. Polyhedral and rounded drop-like shaped crystals characterized the CAD surfaces before Zn-containing amalgam placement. After the restoration removal, plate-like polygons and three-dimensional agglomerated crystals were determined. Crystallites, with improved crystallographic orientation, became shorter and thinner in CAD treated with Zn-containing amalgams, thus increasing mineralization and maturity.
Sponsorship: This work was supported by grants MINECO/FEDERMAT2014- 52036-P and FIS2013-41821-R.
Publisher: Royal Society of Chemistry
Keywords: TEM
Sound dentin
Caries-affected dentin
URI: http://hdl.handle.net/10481/46694
ISSN: 2046-2069
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Toledano Pérez, M.; Submicron-to-nanoscale structure characterization and organization of crystals in dentin bioapatites. RSC Advances, 6: 45265–45278 (2016). [http://hdl.handle.net/10481/46694]
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