Subsurface evaluation of hydrothermal degradation of zirconia

Muñoz-Tabares, J.A.; Jiménez‐Piqué, E.; Anglada, M.

doi:10.1016/j.actamat.2010.09.047

Cited by 105 publications

(83 citation statements)

References 43 publications

(50 reference statements)

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“…Albeit the final word about micro-cracking can only be said by transmission electron microscopy (TEM), evident intergranular micro-cracks were not found in the area close to the t-m border (probably due to a lower volume expansion as a result of a none complete transformation) but frequently closer to the surface (larger volume expansion due to a more fully transformed material), which seems to fit quite well with the model presented by Muñoz-Tabares et al [37], suggesting a "transformation front" of several microns below a "spread" region in which V m increases dramatically to reach a "saturation" zone directly at the samples surface. SEM imaging might therefore be capable in precisely visualizing saturation and spread, whereas Raman spectroscopy also visualizes a transformation front including single and partially transformed grains, even if this limited transformation can have profound effect on the subsequent aging [38,39].…”

Section: Scanning Electron Microscopy Of Cross-sectioned Implantssupporting

confidence: 71%

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

et al. 2017

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Section: Scanning Electron Microscopy Of Cross-sectioned Implantssupporting

confidence: 71%

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

et al. 2017

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“…These microcracks are formed at grain boundaries and they are mostly parallel to the surface as previously observed on SEM images (see Fig. 6) and also reported in previous studies [35,39]. Monoclinic variants are rather perpendicular to the surface as previously observed [35,39].…”

Section: Structure Of the Degraded Layersupporting

confidence: 65%

Assessment of ultrathin yttria-stabilized zirconia foils for biomedical applications

et al. 2015

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Bulk yttria-stabilized zirconia is a well-studied material with various applications, in particular for biomedical devices. Interestingly, it is now possible to obtain thin stand-alone sheets (40 lm thick) of this material. We present a preliminary study dealing with the aging of these foils to determine whether they would be suitable for implantable neurostimulator housing. Accelerated hydrothermal aging experiments were performed at 134°C and 2 bar. Various analyses of the material were carried out, especially by atomic force microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-visible-near-infrared spectroscopy. The results show that the foils maintain their integrity during simulated long-term in vivo experiments, which indicates that they are not prone to fast degradation. The observed monoclinic transformation initiates from the surface and propagates into the bulk, leading to two distinct observable parts within the sheet. The aged and the nonaged parts are separated by a limit almost linear and parallel to the surface. We also show that the micro-strains are not altered significantly after 5 h accelerated aging, and that the optical properties are not modified despite structural modifications. Although further work is needed, we have shown that foils of yttria-stabilized zirconia resist accelerated aging and are thus a promising material for the fabrication of ultrathin implantable devices.

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“…Commercial 3Y-TZP powder (TZ-3YSB-E Tosoh Co., Japan) was cold isostatically compacted under pressure of 200 MPa in a cylindrical mold for producing a green body, and then sintered in an alumina tube furnace at 1450 ºC for two hours (3 ºC/min heating and cooling rates), as described in previous work [19]. The sintered ceramic cylinders were cut into specimens in the form of disks (2 mm thick, 9 mm diameter), which were ground and polished down to a 3 μm diamond suspension.…”

Section: Zirconia Disks Preparationmentioning

confidence: 99%

Hydrofluoric acid etching of dental zirconia. Part 1: etching mechanism and surface characterization

Flamant

Marro

Rovira

et al. 2016

Journal of the European Ceramic Society

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Rough surfaces have been shown to promote osseointegration, which is one of the keys for a successful dental implantation. Among the diverse treatments proposed to roughen zirconia, hydrofluoric acid (HF) etching appears to be a good candidate, however little is known about this process. In this work, the effect of HF concentration and etching time on the surface topography and chemistry of yttria-stabilized zirconia was assessed.Besides, to understand the etching mechanism, the reaction products present in solution and on the surface were characterized. The results indicate suitable parameters for a fast and uniform roughening of zirconia. The formation of adhered fluoride precipitates on the surface is reported for the first time and highlights the importance of cleaning after etching. Finally, it is shown that monitoring the time allows controlling the surface roughness, smooth-rough transition and fractal dimension, which should make possible the fabrication of implants with an optimal topography.

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Subsurface evaluation of hydrothermal degradation of zirconia

Cited by 105 publications

References 43 publications

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

Assessment of ultrathin yttria-stabilized zirconia foils for biomedical applications

Hydrofluoric acid etching of dental zirconia. Part 1: etching mechanism and surface characterization

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