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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Karpukhina, Natalia
in Cooperation with on an Cooperation-Score of 37%
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Publications (8/8 displayed)
- 2024Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure
- 2024Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure
- 2021Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glasses
- 2021Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glassescitations
- 2021Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glasses
- 2018Molecular Dynamics Investigation of Halide-Containing Phospho-Silicate Bioactive Glassescitations
- 2016Design and Synthesis of New Translucent, High Strength Leucite Glass-Ceramics
- 2014Leucite Glass Ceramics
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document
Design and Synthesis of New Translucent, High Strength Leucite Glass-Ceramics
Abstract
Objectives: To synthesize new high strength leucite glass-ceramics.Methods: Alumino-silicate glasses were designed using Appen factors and produced using melt-quench methods. Glasses were melted in an electrical chamber furnace (UAF1600 furnace, Lenton, UK) at 10°C/min to 1550°C and held for 5-6h then annealed (500°C for 1-2h). Glasses were milled (<125) and subjected to crystallisation heat treatments following by milling into glass-ceramic powders (Exp1 and Exp2 groups). Glasses/ Glass-ceramics (GC) were characterized using DSC, 27Al magic angle spinning-nuclear magnetic resonance (MAS-NMR), SEM, Dilatometry and XRD. Flexural strength was evaluated using disc specimens (14mm diamter x 2mm depth, n=30) and the biaxial flexural strength (BFS) test (ball-on-ring test) at a crosshead speed of 1mm/min.Commercial GC’s; IPS-Empress Esthetic (Ivoclar-Vivadent) and Ceramco-3 (Dentsply) were characterised as comparison materials.Results: DSC revealed signs of both bulk and surface crystallisation. XRD indicated a bulk tetragonal leucite phase for all glass-ceramics. SEM revealed a high area fraction (50-54 %) of leucite crystals for Exp1 and Exp2 groups and a lack of matrix microcracking. The 27Al MAS-NMR spectra showed the presence of three strongly overlapped peaks (59-67 ppm) relevant to tetrahedrally coordinated Al in leucite. The results for the Exp1 leucite glass-ceramic indicated a maximum consumption of aluminium into the leucite phase, with minimum Al remaining in the glass matrix compared to the other groups. Mean (SD) MPa BFS were: Exp1: 212.2 (28.2) Exp2: 229.7 (40.4) Empress: 165.5 (30.6) Ceramco-3: 75.7 (6.8). The Exp1 and Exp2 groups had statistically higher flexural strength and characteristic strength values compared with Empress and Ceramco-3 glass-ceramics (p<0.05). Glass-ceramic CTE (x 10-6/K, 100 - 400°C) values were: Exp1: 21.0, IPS Empress: 16.7; Ceramco-3: 12.8.Conclusions: New high strength, translucent glass-ceramics were synthesized where a maximum consumption of Al into the leucite phase was achieved.This abstract is based on research that was funded entirely or partially by an outside source: Funding from St. Bartholomew’s and The Royal London Charitable Foundation (RAB05/PJ/06).