Publicaties
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Synthesis of yttria stabilized zirconia - multi-walled nanotube nanocomposites by direct in-situ growth of MWNTs on zirconia particles KU Leuven
Zirconia is one of the most widely investigated structural ceramics and is widely used as a refractory material in metallurgy and structural components for engine applications. Zirconia exhibits high strength, fracture toughness and wear resistance properties compared to other ceramics, but like all other ceramics, it is brittle. Various attempts have been made to reinforce Zirconia with reinforcing fibers2-26. Carbon Nanotubes (CNTs) are 100 ...
AGEING-RESISTANT ZIRCONIA CERAMICS FOR DENTAL RESTORATIONS KU Leuven
Today, zirconia-based restorations have become popular in dentistry. Thanks to their superb biocompatibility and favourable mechanical properties, yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics are used not only as an alternative for conventional porcelain-fused-to-metal restorations, but also as implant abutments or even implants.The overall objectives of this work were (1) to assess the low-temperature degradation ...
3D Printing of Monolithic Zirconia Ceramics for Dental Restorations KU Leuven
About 60% of today's indirect dental restorations, or fixed dental prostheses (FDPs) are made of ZrO2 ceramics. They exhibit excellent mechanical properties (strength & toughness), are chemically stable, are biocompatible and have a natural aesthetic. 3 mol% yttria-stabilized zirconia (3Y-TZP) is the most commonly used type of ZrO2 for dental restorations. 3Y-TZP is a submicrometer grained transformation toughened ceramic with mechanical ...
Alumina toughened zirconia reinforced with equiaxed and elongated lanthanum hexa-aluminate precipitates KU Leuven
Three different alumina sources (boehmite, aluminium nitrate and α-alumina particles) and 12Ce-TZP powder containing 1 wt% lanthanum oxide were used to prepare 12Ce-TZP-based alumina-toughened-zirconia (ATZ) composites. The obtained ATZs had similar density and phase composition, whereas the microstructures were significantly different. Alumina-particle addition gave rise to a typical ATZ microstructure consisting of equiaxial sub-micrometer ...
Compatibility issues of yttria-stabilized zirconia solid oxide membrane in the direct electro-deoxidation of metal oxides KU Leuven
Direct electro‐deoxidation of metal oxides has become quite popular in the production of metals and alloys. In this process, metal oxide cathode is directly reduced to a metal in a molten CaCl2 salt bath. The anode material used is graphite. Over the years, graphite is reported to cause numerous process difficulties. Recently, based on the solid oxide membrane technology, yttria‐stabilized zirconia (YSZ) has been tested as oxygen ion conducting ...
Does speed-sintering affect the optical and mechanical properties of yttria-stabilized zirconia? A systematic review and meta-analysis of in-vitro studies KU Leuven
Zirconia restorations are increasingly popular in dental treatment. Yttria-stabilized zirconia (YSZ) needs to be sintered for clinical applications and novel speed-sintering protocols are being developed for chairside treatments. Whether the properties of speed-sintered YSZ meet clinical requirements, however, remains unclear. Therefore, we conducted a systematic review and meta-analysis on the influence of speed-sintering on the optical and ...
Influence of light irradiation through zirconia on the degree of conversion of composite cements KU Leuven
Purpose: To assess the light irradiance (LI) delivered by two light-curing units and to measure the degree of conversion (DC) of three composite cements and one flowable composite when cured through zirconia or ceramic-veneered zirconia plates with different thicknesses. Materials and Methods: Three dual-curing composite cements (Clearfil Esthetic Cement, Panavia F2.0, G-CEM LinkAce) and one light-curing flowable composite (G-aenial Universal ...
Esthetic and Clinical Performance of Implant-Supported All-Ceramic Crowns Made with Prefabricated or CAD/CAM Zirconia Abutments: A Randomized, Multicenter Clinical Trial KU Leuven
Patients' esthetic expectations are increasing, and the options of the prosthetic pathways are currently evolving. The objective of this randomized multicenter clinical trial was to assess and compare the esthetic outcome and clinical performance of anterior maxillary all-ceramic implant crowns (ICs) based either on prefabricated zirconia abutments veneered with pressed ceramics or on CAD/CAM zirconia abutments veneered with hand buildup ...
Development of Tough and Strong Zirconia Ceramics for Dental Implants KU Leuven
This doctoral research focused on the processing of innovative tough, strong, reliable and damage-tolerant zirconia ceramics and zirconia-based composites. In the first approach (1), the microstructure and the phase transformability of the monolithic tetragonal zirconia, a 10 mol% ceria-stabilized zirconia (10Ce), was optimized by doping with 0.2-2.0 mol% divalent oxides. The dopants were aimed to tailor the grain-boundary structure. The second ...