Effects of glass chemistry on the optical properties of highly translucent alumina-glass biocomposites for dental restorations
| Autor: | Paulo Francisco Cesar, Afonso Chimanski, Humberto Naoyuki Yoshimura |
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| Rok vydání: | 2017 |
| Předmět: |
Toughness
Materials science Wavelength range Process Chemistry and Technology 030206 dentistry 02 engineering and technology Limiting 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials 03 medical and health sciences Viscosity Wavelength 0302 clinical medicine visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Transmittance Ceramic Composite material Biocomposite 0210 nano-technology |
| Zdroj: | Ceramics International. 43:13970-13977 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2017.07.129 |
| Popis: | Glass-infiltrated ceramic biocomposites have shown high strength and toughness, which results in long lifetime, but their translucency is relatively low, limiting the aesthetic quality of dental restorations. This study evaluated the effects of glass compositions based on the system SiO 2 -B 2 O 3 -Al 2 O 3 -La 2 O 3 -TiO 2 -CaO-CeO 2 , designed using SciGlass software, on the optical properties of alumina-based biocomposites. For (45-x)SiO 2 -xB 2 O 3 -25Al 2 O 3 -15La 2 O 3 -15TiO 2 glasses, the increase in B 2 O 3 content enhanced the infiltration of glass in the alumina preform because of the decrease in glass viscosity. The addition of CaO enhanced the infiltration depth and increased light transmittance of the biocomposite in the visible region (wavelength between 360 and 740 nm); however, the addition of CeO 2 significantly decreased the transmittance, particularly at the low wavelength range, because of the coloring effect (yellowish color due to the formation of cerium-titanium complexes). The highest transmittance was measured for biocomposites infiltrated with glass of composition 25% SiO 2 -20% B 2 O 3 -20% Al 2 O 3 -15% La 2 O 3 -15% TiO 2 -5% CaO (mol%). |
| Databáze: | OpenAIRE |
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