Microstructural development during crystallization firing of a dental-grade nanostructured lithia-zirconia glass-ceramic
| Autor: | Camila da Silva Rodrigues, Fernando Guiberteau, Angel L. Ortiz, Yu Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Glass-ceramic Nanostructure chemistry.chemical_element Crystal growth 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Chemical engineering Nanocrystal chemistry law 0103 physical sciences Lithia Materials Chemistry Ceramics and Composites Cubic zirconia Lithium Crystallization 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 41:5728-5739 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2021.04.036 |
| Popis: | The microstructural development during crystallization firing of a commercially-available dental-grade nanostructured lithia-zirconia glass-ceramic (Vita Suprinity® PC) was unraveled using a wide battery of ex-situ and in-situ characterization techniques. It was found that the milling blocks are slightly crystallized glass-ceramics, with a complex chemical composition and consisting of partially de-polymerized glass plus lithium silicate (Li2SiO3) nanocrystals. It was also found that during crystallization firing the glassy matrix first reacts with part of the Li2SiO3 to form lithium disilicate (Li2Si2O5) at ∼810−820 °C, and then lithium orthophosphate (Li3PO4) precipitates from the glass. This results in glass-ceramics with abundant nanocrystals embedded in a sparse zirconosilicate glass matrix (containing many other cations subsumed) that, due to its high viscosity, inhibited crystal growth. Therefore, these dental glass-ceramics are not reinforced with zirconia (ZrO2) crystals unless over-fired above ∼890 °C and at the expense of its singular nanostructure. Finally, this study opens doors for optimizing the clinical performance of these dental glass-ceramics via microstructural tailoring. |
| Databáze: | OpenAIRE |
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