XRD and FTIR crystallinity indices in sound human tooth enamel and synthetic hydroxyapatite
| Autor: | R. García-García, José Reyes-Gasga, Gaby E. Tiznado-Orozco, Etienne F. Brès, Galois Rodríguez-Álvarez, Esmeralda Martínez-Piñeiro |
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| Rok vydání: | 2013 |
| Předmět: |
Diffraction
Materials science Analytical chemistry Infrared spectroscopy Bioengineering Crystal structure Biomaterials Crystallinity Microscopy Electron Transmission X-Ray Diffraction stomatognathic system Human tooth Spectroscopy Fourier Transform Infrared medicine Humans Fourier transform infrared spectroscopy Dental Enamel Enamel paint Temperature Durapatite medicine.anatomical_structure Mechanics of Materials visual_art visual_art.visual_art_medium Degree of order Crystallization Tooth |
| Zdroj: | Materials Science and Engineering: C. 33:4568-4574 |
| ISSN: | 0928-4931 |
| DOI: | 10.1016/j.msec.2013.07.014 |
| Popis: | The crystallinity index (CI) is a measure of the percentage of crystalline material in a given sample and it is also correlated to the degree of order within the crystals. In the literature two ways are reported to measure the CI: X-ray diffraction and infrared spectroscopy. Although the CI determined by these techniques has been adopted in the field of archeology as a structural order measure in the bone with the idea that it can help e.g. in the sequencing of the bones in chronological and/or stratigraphic order, some debate remains about the reliability of the CI values. To investigate similarities and differences between the two techniques, the CI of sound human tooth enamel and synthetic hydroxyapatite (HAP) was measured in this work by X-ray diffraction (XRD) and Fourier Transform Infrared spectroscopy (FTIR), at room temperature and after heat treatment. Although the (CI)XRD index is related to the crystal structure of the samples and the (CI)FTIR index is related to the vibration modes of the molecular bonds, both indices showed similar qualitative behavior for heat-treated samples. At room temperature, the (CI)XRD value indicated that enamel is more crystalline than synthetic HAP, while (CI)FTIR indicated the opposite. Scanning (SEM) and transmission (TEM) images were also used to corroborate the measured CI values. |
| Databáze: | OpenAIRE |
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