XRMA analysis and X-ray diffraction analysis of dental enamel from human permanent teeth exposed to hydrogen peroxide of varying pH
| Autor: | Lennart Sjölin, Andreas Karlsson, Nina Sabel |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Scanning electron microscope
02 engineering and technology Microanalysis 03 medical and health sciences chemistry.chemical_compound Crystallinity 0302 clinical medicine stomatognathic system Hydrogen peroxide General Dentistry Chemical composition Enamel paint Research 030206 dentistry Esthetic Dentistry 021001 nanoscience & nanotechnology CIENCIAS MÉDICAS [UNESCO] stomatognathic diseases chemistry visual_art UNESCO::CIENCIAS MÉDICAS X-ray crystallography visual_art.visual_art_medium 0210 nano-technology Powder diffraction Nuclear chemistry |
| Zdroj: | Sabel, Nina ; Karlsson, Andreas ; Sjolin, Lennart. XRMA analysis and X-ray diffraction analysis of dental enamel from human permanent teeth exposed to hydrogen peroxide of varying pH. En: Journal of Clinical and Experimental Dentistry, 11 6 2019: 512-520 RODERIC. Repositorio Institucional de la Universitat de Valéncia instname Journal of Clinical and Experimental Dentistry |
| Popis: | Background This in vitroinvestigation shows how 3.3% H2O2, at different pH-values affects the enamel. Material and Methods A number of fifteen human premolars were used. The enamel of the coronal half in six of the teeth, were exposed by H2O2. Nine teeth were prepared to enamel powder. The enamel was exposed to 3.3% H2O2, at six different pH-values (pH range 4.5 - 7.0). Analyses of the topography of enamel performed by scanning electron microscope (SEM) and the chemical composition of enamel by X-ray microanalysis (XRMA). X-ray powder diffraction (XRD) analysed the crystallinity in enamel powder. Results The exposure to H2O2 at pH5.5 resulted in a decrease of O in the exposed enamel, and changes in C:P, Ca:C, Ca:P and Ca:O were observed. The H2O22 did not affect the unit cell parameters, but the signal-to-noise level was increased for slightly acidic or neutral solutions. The unit cell parameters decreased in the acidic solutions. Conclusions The exposure to H2O2 at varying pH values affect the enamel with two different mechanisms. One effect is the oxidation of the organic or bioorganic matter in the hydroxyapatite matrix, due to the use of 3.3% H2O2. The other effect is due to the current pH of the H2O2, since the structure of the hydroxyapatite starts to erode when the pH |
| Databáze: | OpenAIRE |
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