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  • 1.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF, Keramer.
    Zirconia in applications with bone contact2016Conference paper (Other academic)
  • 2. Andersson, L.
    et al.
    Larsson, P.T.
    RISE, Innventia.
    Wågberg, L.
    Bergström, L.
    Evaluating pore space in macroporous ceramics with water-based porosimetry2013In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, no 6, p. 1916-1922Article in journal (Refereed)
  • 3.
    Anderud, Jonas
    et al.
    Malmö University, Sweden; Region Halland, Sweden.
    Abrahamsson, Peter
    Region Halland, Sweden.
    Jimbo, Ryo
    Malmö University, Sweden.
    Isaksson, Sten
    Region Halland, Sweden.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Malmström, Johan
    Region Halland, Sweden.
    Naito, Yoshihito
    University of Tokushima, Japan.
    Wennerberg, Ann
    Malmö University, Sweden.
    Guided bone augmentation using ceramic space-maintaining devices: The impact of chemistry2015In: Clinical, Cosmetic and Investigational Dentistry, ISSN 1179-1357, E-ISSN 1179-1357, Vol. 7, p. 45-53Article in journal (Refereed)
    Abstract [en]

    The purpose of the study was to evaluate histologically, whether vertical bone augmentation can be achieved using a hollow ceramic space maintaining device in a rabbit calvaria model. Furthermore, the chemistry of microporous hydroxyapatite and zirconia were tested to determine which of these two ceramics are most suitable for guided bone generation. 24 hollow domes in two different ceramic materials were placed subperiosteal on rabbit skull bone. The rabbits were sacrificed after 12 weeks and the histology results were analyzed regarding bone-to-material contact and volume of newly formed bone. The results suggest that the effect of the microporous structure of hydroxyapatite seems to facilitate for the bone cells to adhere to the material and that zirconia enhance a slightly larger volume of newly formed bone. In conclusion, the results of the current study demonstrated that ceramic space maintaining devices permits new bone formation and osteoconduction within the dome.

  • 4.
    Dehestani, Mahdi
    et al.
    Purdue University, USA.
    Zemlyanov, Dmitry Yu
    Purdue University, USA.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Stanciu, Lia A.
    Purdue University, USA.
    Improving bioactivity of inert bioceramics by a novel Mg-incorporated solution treatment2017In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 425, p. 564-575Article in journal (Refereed)
    Abstract [en]

    Zirconia/alumina ceramics possess outstanding mechanical properties for dental and orthopedic applications, but due to their poor surface bioactivities they exhibit a weak bone-bonding ability. This work proposes an effective 30-min solution treatment which could successfully induce formation of bone-like apatite on the surface of 3Y-TZP and a ternary composite composed of yttria-stabilized zirconia, ceria-stabilized zirconia, and alumina (35 vol% 3Y-TZP + 35 vol% 12Ce-TZP + 30 vol% Al2O3) after 3 weeks immersion in simulated body fluid (SBF). XRD was used for phase identification in the ceramic materials. The influence of solution treatment on the surface chemistry and its role on apatite formation were investigated via SEM, EDS and XPS. In vitro apatite-forming ability for the solution-treated and untreated samples of the composite and individual substrates of 3Y-TZP, 12Ce-TZP, and Al2O3 was evaluated by immersion in SBF. Apatite crystals were formed only on 3Y-TZP and composite substrates, implying that it is mainly the 3Y-TZP constituent that contributes to the bioactivity of the composite. Further, it was found from the XPS analysis that the zirconia material with higher phase stability (12Ce-TZP) produced less Zr–OH functional groups on its surface after solution treatment which accounts for its weaker bioactivity compared to 3Y-TZP. 

  • 5.
    Fornabaio, Marta
    et al.
    Politecnico di Torino, Italy; EPFL École Polytechnique Fédérale de Lausanne, Switzerland.
    Reveron, Helen
    INSA Lyon, France.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Montanaro, Laura
    Politecnico di Torino, Italy.
    Chevalier, Jérôme
    INSA Lyon, France.
    Palmero, Paola
    Politecnico di Torino, Italy.
    Design and development of dental ceramics: Examples of current innovations and future concepts2017In: Advances in Ceramic Biomaterials: Materials, Devices and Challenges / [ed] Palmero, P., Cambier, F., De Barra, E., Elsevier Inc. , 2017, 1, p. 355-389Chapter in book (Other academic)
  • 6.
    Johansson, Emil
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Lidström, Oscar
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Jan, Johansson
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Influence of Resin Composition on the Defect Formation in Alumina Manufactured by Stereolithography2017In: Materials, ISSN ISSN 1996-1944, Vol. 10, no 2, article id 138Article in journal (Refereed)
    Abstract [en]

    Stereolithography (SL) is a technique allowing additive manufacturing of complex ceramic parts by selective photopolymerization of a photocurable suspension containing photocurable monomer, photoinitiator, and a ceramic powder. The manufactured three-dimensional object is cleaned and converted into a dense ceramic part by thermal debinding of the polymer network and subsequent sintering. The debinding is the most critical and time-consuming step, and often the source of cracks. In this study, photocurable alumina suspensions have been developed, and the influence of resin composition on defect formation has been investigated. The suspensions were characterized in terms of rheology and curing behaviour, and cross-sections of sintered specimens manufactured by SL were evaluated by SEM. It was found that the addition of a non-reactive component to the photocurable resin reduced polymerization shrinkage and altered the thermal decomposition of the polymer matrix, which led to a reduction in both delamination and intra-laminar cracks. Using a non-reactive component that decomposed rather than evaporated led to less residual porosity.

  • 7. Karlsson, Sven
    New ceramic trends and ceramic applications2015Conference paper (Other academic)
  • 8.
    Malmström, Johan
    et al.
    Maxillofacial Unit Halmstad, Sweden.
    Anderud, Jonas
    Maxillofacial Unit Halmstad, Sweden.
    Abrahamsson, Peter
    Maxillofacial Unit Halmstad, Sweden.
    Wälivaara, Dan Åke
    Maxillofacial Unit Halmstad, Sweden.
    Isaksson, Sten G.
    Maxillofacial Unit Halmstad, Sweden.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Guided bone regeneration using individualized ceramic sheets2016In: International Journal of Oral and Maxillofacial Surgery, ISSN 0901-5027, E-ISSN 1399-0020, Vol. 45, no 10, p. 1246-1252Article in journal (Refereed)
    Abstract [en]

    Guided bone regeneration (GBR) describes the use of membranes to regenerate bony defects. A membrane for GBR needs to be biocompatible, cell-occlusive, non-toxic, and mouldable, and possess space-maintaining properties including stability. The purpose of this pilot study was to describe a new method of GBR using individualized ceramic sheets to perfect bone regeneration prior to implant placement; bone regeneration was assessed using traditional histology and three-dimensional (3D) volumetric changes in the bone and soft tissue. Three patients were included. After full-thickness flap reflection, the individualized ceramic sheets were fixed. The sites were left to heal for 7 months. All patients were evaluated preoperatively and at 7 months postoperative using cone beam computed tomography and 3D optical equipment. Samples of the regenerated bone and soft tissue were collected and analyzed. The bone regenerated in the entire interior volume of all sheets. Bone biopsies revealed newly formed trabecular bone with a lamellar structure. Soft tissue biopsies showed connective tissue with no signs of an inflammatory response. This was considered to be newly formed periosteum. Thus ceramic individualized sheets can be used to regenerate large volumes of bone in both vertical and horizontal directions independent of the bone defect and with good biological acceptance of the material.

  • 9.
    Pompe, Robert
    et al.
    Goceram.
    Eklund, L.
    Johansson, Lars-Gunnar
    Chalmers Tekniska Högskola.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Svensson, Jan-Erik
    Chalmers Tekniska Högskola.
    Evaluation of ceramic sacrificial coatings for improved alkaliinduced corrosion protection in biofuel-fired boilers2013Conference paper (Refereed)
    Abstract [en]

    In the combustion of bio-based fuels the critically exposed burner parts in small boilers are typically uncooled and are usually made of FeCrNi alloys. These materials can suffer attack from the ashes because of the formation of alkali chromate. The reaction depletes the protective oxide in chromia, leading to accelerated corrosion. Selected "acidic" ceramic coatings based on Ti, Si, B and P have been evaluated for use as sacrificial layers to prevent the initial reaction of alkali and chromium. An accelerated oxidation test method including mild thermal shock has been utilized that previously proved useful to provide application-relevant results. A comparison of coated and uncoated specimens was performed with an austenitic high temperature steel as a substrate. The results indicate that the alkali released from the ash reacts with the respective "acidic" elements in the deposited coatings. This reaction has promoted initial formation of a thin and continuous chromium-rich protective oxide sub-layer. In addition, the oxide scale formed on the coated specimens appeared more coherent and crack-free. A significant enrichment of Ni at the steel-oxide interface also occurred that can promote high temperature corrosion resistance. 

  • 10.
    Shen, Zhijian
    et al.
    Stockholm University, Sweden.
    Liu, Leifeng
    Stockholm University, Sweden.
    Xu, Xiqing
    Stockholm University, Sweden.
    Zhao, Jing
    Stockholm University, Sweden.
    Eriksson, Mirva
    Stockholm University, Sweden.
    Zhong, Yuan
    Stockholm University, Sweden.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Liu, Yihong
    Peking University School and Hospital of Stomatology, China.
    Kocjan, Andraz
    Jozef Stefan Institute, Slovenia.
    Fractography of self-glazed zirconia with improved reliability2017In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, ISSN 09552219, Vol. 37, no 14, p. 4339-4345Article in journal (Refereed)
    Abstract [en]

    The fractography of a new grade of zirconia ceramics, known as self-glazed zirconia, was investigated. The as-sintered intact top surface was made with superior smoothness that mimicked the optical appearances of the natural teeth enamel. The beneath surface opposite to this was made hierarchically rough with microscopic pits of the size up to 60. μm together with grain-level roughness of about 2. μm. The three-point bending test of the samples made with the hierarchically rough surface being tensile one demonstrated an average bending strength of 1120. ±. 70. MPa and a Weibull modulus of as high as 18 ascribed to the improved structural homogeneity. Surface topography was found the main origins of crack initiation leading to fracture. The observed unusually predominant transgranular fracture mode of submicron-sized grains disclosed a possible toughening mechanism of disassembling of mesocrystalline grains that differs significantly from the commonly quoted phase transformation toughening of this category of ceramics.

  • 11.
    Stiernstedt, Johanna
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Carlström, Elis
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Environmental and Quality Analysis of Aqueous Tape Casting2011Conference paper (Refereed)
    Abstract [en]

    Ceramic tapes are traditionally produced by tape casting using organic solvents. The use of organic solvents has been questioned due to health, environmental and fire hazard risks. The use of water-based tape casting can reduce these problems. This study contains an environmental assessment of ceramic tapes in a life cycle perspective. Two tape casting techniques, using different solvents during the tape casting, are analyzed from cradle to grave, ie, from raw material production, manufacturing, application and recycling. The functional unit was defined as tape with 1000 gram of alumina content. Tape casting with water based solvent was compared to tape casting with hydrocarbon based solvent. In principal, only differing processes were examined. There are also quality issues associated with water based tape casting: the drying is slower and can cause cracking, air bubbles can be entrapped, and in some cases there can be problems with wetting. These problems can be handled by controlling the colloidal and rheological properties and using a system with high solids loading. In conclusion the results show that water based tape casting gives tapes of high quality and that a lower environmental impact is possible compared to solvent based tape casting. It is further shown that the sintering of the green tape, which follows the tape casting, is probably the process with most climate impact in the life cycle of a ceramic tape.

  • 12.
    Venturini, F
    et al.
    Zurich University of Applied Sciences, Switzerland.
    Schönherr, V
    Zurich University of Applied Sciences, Switzerland.
    Rey, J. M.
    Zurich University of Applied Sciences, Switzerland.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF, Keramer.
    Characterization of strongly scattering nanoporous materials as miniaturized multipass cell for tunable diode laser absorption spectroscopy2017In: Applied Physics B: Lasers and Optics, ISSN 09462171, Vol. 123, no 4, article id 136Article in journal (Refereed)
    Abstract [en]

    Through the confinement of gas in nanoporous materials, it is possible to significantly increase the path length for light–gas interaction. This enables the observation of much stronger absorption features for the confined gas molecules. In this work, we systematically characterized a variety of disordered strongly scattering ZrO2 and Al2O3 nanoporous ceramic materials to exploit the potential of gas in scattering media absorption spectroscopy. As a result, we identified a material with an unprecedented performance in terms of optical path length enhancement. In ZrO2 with thicknesses above 6 mm, the path enhancement exceeds 1000. The results obtained with near-infrared absorption spectroscopy on oxygen were validated by time-of-flight measurements at 700 nm, thus demonstrating their robustness. Finally, we report quantitative oxygen concentration measurement using nanoporous materials as miniaturized random-scattering multipass cell with an extremely simple and low-cost setup.

1 - 12 of 12
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