The effect of TiO2 concentration on properties of apatite-mullite glass-ceramics for dental use
| Autor: | Hawa M Fathi, Anthony Johnson |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Ceramics
Differential Thermal Analysis Materials science Scanning electron microscope Mineralogy chemistry.chemical_element Mullite 02 engineering and technology Apatite Dental Materials 03 medical and health sciences 0302 clinical medicine X-Ray Diffraction Flexural strength Apatites Differential thermal analysis Materials Testing General Materials Science Ceramic Composite material Solubility General Dentistry Titanium 030206 dentistry 021001 nanoscience & nanotechnology chemistry Mechanics of Materials visual_art Microscopy Electron Scanning visual_art.visual_art_medium Glass 0210 nano-technology |
| Zdroj: | Dental Materials. 32:311-322 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2015.11.012 |
| Popis: | The aim of this study was to evaluate the effect of TiO2 concentration on the properties of apatite-mullite glass-ceramics namely strength and the chemical solubility to comply with the ISO standard recommendations for dental ceramics (BS EN ISO 6872-2008).Ten novel glass-ceramic materials were produced based on the general formula (4.5SiO2-3Al2O3-1.5P2O5-3CaO-CaF2-xTiO2) where x varied from 0.5 to 5 wt%. Glass with no TiO2 added (HG1T0.0) was used as a reference. Discs of 12 mm diameter and 1.6 mm (±0.2 mm) thickness were prepared for both biaxial flexural strength (BFS) and chemical solubility testing, in accordance with the BS EN ISO 6872-2008 for dental ceramics. All produced materials were investigated using differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Energy dispersive X-ray analysis (EDS) was also carried out on some samples to identify the element composition of samples.Increasing the concentration of TiO2 from 0.5 wt% to 2 wt% significantly (P0.05) increased the chemical solubility of the material. With the material containing 2.5 wt% of TiO2, the solubility significantly reduced (P0.05) and resulted in a solubility value of 228.3 μm/cm(2) and BFS value of 197.9 MPa. Increasing the TiO2 concentration more than 2.5 wt%, led to a significant (P0.05) increase in solubility and a reduction in BFS.TiO2 is an effective agent for improving the durability and the mechanical properties of an apatite-mullite glass-ceramic only up to 2.5 wt% concentration. |
| Databáze: | OpenAIRE |
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