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Highly translucent and strong ZrO2-SiO2 nanocrystalline glass ceramicprepared by sol-gel method and spark plasma sintering with fine 3Dmicrostructure for dental restoration
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Material in Medicine)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Uppsala university. (Material in Medicine)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Material in Medicine)
2017 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 37, 4067-4081 p.Article in journal (Refereed) Published
Abstract [en]

Balance of better mechanical strength and good translucency for dental restorative materials is alwaysa challenge. A translucent glass ceramic/ceramic with improved mechanical properties or a strongglass ceramic/ceramic with good translucency would therefore be interesting for dental application.Nanocrystalline glass ceramics (NCGC) attract a lot attention because of their superior optical andmechanical properties. This study aims to obtain ZrO2-SiO2 nanocrystalline glass-ceramic that possesseshigh mechanical strength as well as excellent translucency by controlling the content, size, and connectionof nanocrystalline ZrO2 in a ZrO2-SiO2 glass-ceramic material. Toward this end, well-homogenized nano-powders with three different compositions, 45%ZrO2-55%SiO2 (molar ratio, 45Zr), 55%ZrO2-45%SiO2(55Zr), and 65%ZrO2-35%SiO2 (65Zr), were synthesized, followed by a fast sintering process. Highly-translucent nanocrystalline glass ceramics composed of tetragonal ZrO2 were obtained. Samples withhigh zirconia content showed that the structure of the skeleton was predominately built by nano-sizedellipsoidal ZrO2 particles bonded by grain boundaries, with amorphous SiO2 filling the voids betweenthe ZrO2 particles. The achieved flexural strength measured by piston-on-three-ball test was as high as1014 MPa. To our knowledge, this is one of the highest flexural strength values of glass ceramics everreported, which is higher than transparent zirconia and alumina ceramics. The 3D structure of nanocrys-talline zirconia in silica matrix did enhance the flexural strength of the NCGC. The results of this studysuggest that the new ZrO2-SiO2 NCGC has great potential of using as dental restoration.

Place, publisher, year, edition, pages
2017. Vol. 37, 4067-4081 p.
Keyword [en]
Nanocrystalline glass ceramics, ZrO2-SiO2, Translucency, High strength, 3D microstructure
National Category
Physical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-330141DOI: 10.1016/j.jeurceramsoc.2017.05.039OAI: oai:DiVA.org:uu-330141DiVA: diva2:1144578
Funder
Carl Tryggers foundation
Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2017-09-27

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Publisher's full texthttp://linkinghub.elsevier.com/retrieve/pii/S0955221917303825

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