The constitution of mineral trioxide aggregate
| Autor: | Thomas R. Pitt Ford, Josette Camilleri, Richard Curtis, Franco E. Montesin, Ken Brady, Richard Sweeney |
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| Rok vydání: | 2005 |
| Předmět: |
Mineral trioxide aggregate
Silicon Materials science Surface Properties Scanning electron microscope Iron chemistry.chemical_element Phosphates Bismuth law.invention Root Canal Filling Materials chemistry.chemical_compound X-Ray Diffraction law Immersion Humans General Materials Science Crystallization Aluminum Compounds General Dentistry Crystallography Silicates Metallurgy Water Humidity Oxides Calcium Compounds Silicate Oxygen Drug Combinations Portland cement chemistry Mechanics of Materials X-ray crystallography Microscopy Electron Scanning Calcium Aluminum Electron Probe Microanalysis Nuclear chemistry |
| Zdroj: | Dental Materials. 21:297-303 |
| ISSN: | 0109-5641 |
| Popis: | Summary Objectives The aim of this study was to determine the constitution of a commercially available root-end filling material, mineral trioxide aggregate, (MTA) (ProRoot MTA, Tulsa Dental, Tulsa, OK, USA). The surface morphology of the material with various treatment conditions was also evaluated. Methods The constitution of two commercial versions of MTA was determined before and after mixing with water. The unset material was analysed using Energy Dispersive Analysis by X-ray (EDAX) in a scanning electron microscope (SEM) and X-ray diffraction (XRD). The first technique identified the constituent elements while XRD analysis identified the compounds or phases present. The set material was evaluated using EDAX. The surface morphology of the material stored under various conditions (100% humidity, immersion in water, or immersion in phosphate solution) was evaluated using SEM. Results The EDAX showed the white MTA to be composed primarily of calcium, silicon, bismuth and oxygen, with the gray MTA also having small peaks for iron and aluminum. The XRD analysis showed gray MTA to be composed primarily of tricalcium silicate and dicalcium silicate. The surface morphology of the materials differed under the various conditions, particularly following immersion in phosphate solution with crystal formation. Significance The commercial versions of MTA were shown to have broadly similar constitution to ordinary Portland cement except for the addition of bismuth compounds. The white MTA did not contain iron. |
| Databáze: | OpenAIRE |
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