On the kinetics and impact of tetragonal to monoclinic transformation in an alumina/zirconia composite for arthroplasty applications

Chevalier, Jérôme; Grandjean, Sylvie; Kuntz, Meinhard; Pezzotti, Giuseppe

doi:10.1016/j.biomaterials.2009.06.022

Cited by 144 publications

(113 citation statements)

References 13 publications

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“…The tests were performed in an autoclave, at 134 ºC, 100% steam atmosphere at 0.2 MPa pressure for times up to 600 h. This time is far beyond the requirement of 10 h recommended by the ISO 6474-2 standard and according to Chevalier et al (2009) [41] it is equivalent to about 1500 years at 37 ºC. It is thus extremely conservative but monitoring the long-term evolution of the monoclinic phase content allows amplifying potential differences between groups.…”

Section: Ageing Kineticsmentioning

confidence: 99%

“…Even if ZTA is much more resistant to LTD than monolithic zirconia, it has been shown that it can still present a certain degree of surface tetragonal to monoclinic phase transformation in the presence of water [39][40][41]. All these elements lead to the following conclusion: to ensure longterm reliability and patient safety, any change in the processing of zirconia-containing ceramics should be accompanied with a careful assessment of its impact on mechanical properties and ageing sensitivity, especially in the presence of porosity.…”

Section: Introductionmentioning

confidence: 99%

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Selective etching of injection molded zirconia-toughened alumina: Towards osseointegrated and antibacterial ceramic implants

et al. 2016

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Due to their outstanding mechanical properties and excellent biocompatibility, zirconiatoughened alumina (ZTA) ceramics have become the gold standard in orthopedics for the fabrication of ceramic bearing components over the last decade. However, ZTA is bioinert, which hampers its implantation in direct contact with bone. Furthermore, periprosthetic joint infections are now the leading cause of failure for joint arthroplasty prostheses. To address both issues, an improved surface design is required: a controlled micro-and nano-roughness can promote osseointegration and limit bacterial adhesion whereas surface porosity allows loading and delivery of antibacterial compounds. In this work, we developed an integrated strategy aiming to provide both osseointegrative and antibacterial properties to ZTA surfaces. The microtopography was controlled by injection molding. Meanwhile a novel process involving the selective dissolution of zirconia (selective etching) was used to produce nano-roughness and interconnected nanoporosity. Potential utilization of the porosity for loading and delivery of antibiotic molecules was demonstrated, and the impact of selective etching on mechanical properties and hydrothermal stability was shown to be limited. The combination of injection molding and selective etching thus appears promising for fabricating a new generation of ZTA components implantable in direct contact with bone.3

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Section: Ageing Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective etching of injection molded zirconia-toughened alumina: Towards osseointegrated and antibacterial ceramic implants

et al. 2016

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“…From a compositional point of view, considering the effect of the dispersion of fine ZrO 2 grains in an alumina matrix on its mechanical behavior [33][34][35], the formation and propagation of the cracks in the ceramic walls of the porous components could be controlled by the exploitation of aluminazirconia composites.…”

Section: Discussionmentioning

confidence: 99%

“…Alumina-zirconia composite ceramics are widely used for various structural applications, due to their increased mechanical properties produced by the dispersion of fine ZrO 2 grains inside the alumina matrix. In fact, the dispersion of 5-20 vol% tetragonal zirconia particles in the alumina matrix can significantly improve the fracture toughness of the neat matrix due to the tetragonal/monoclinic transformation of the zirconia phase under loading [33][34][35]. Most of the current applications of alumina-zirconia composites are based on dense, fully sintered materials, without porosity.…”

Section: Introductionmentioning

confidence: 99%

Development and mechanical characterization of novel ceramic foams fabricated by gel-casting

Tulliani

Lombardi

Palmero

et al. 2013

Journal of the European Ceramic Society

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Porous ceramic materials are of considerable interest for a variety of chemical and industrial applications in extremely harsh conditions, particularly at very high temperatures for long times. A modified gelcasting process employing agar as a natural gelling agent and polyethylene spheres as pore formers was exploited to produce porous ceramic bodies. Alumina and alumina-ZrO 2 (AZ) powders were used to prepare samples having a porosity of about 65-70-75 vol%. The composite powder was produced by a surface modification route, i.e. by coating a well dispersed alphaalumina powder with a zirconium chloride aqueous solution. Upon thermal treatment, ultra-fine tetragonal zirconia grains formed on the surface of the alumina particles. SEM observations and image analysis were used to characterize the microstructure of porous samples and uniaxial compressive tests were used to measure their mechanical behavior.

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“…To reduce wear particles, improve stability, and increase the longevity of artificial hip joints, studies have focused on various bearing alternatives and the improvement of bearing materials [4][5][6][7][8][9][10]. Recently, studies have shown that poly(ether-ether-ketone) (PEEK) might be useful in reducing wear debris and improving stability.…”

Section: Introductionmentioning

confidence: 99%

Smart PEEK Modified by Self-Initiated Surface Graft Polymerization for Orthopedic Bearings

Kyomoto¹,

Moro²,

Yamane³

et al. 2014

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Poly(ether-ether-ketone) (PEEK)s are a group of polymeric biomaterials with excellent mechanical properties, chemical stability, and nonmagnetism. In the present study, we propose a novel self-initiated surface graft polymerization technique, using which we demonstrate the fabrication of a highly hydrophilic and biocompatible nanometer-scale layer on the surfaces of PEEK and carbon fiber-reinforced PEEK (CFR-PEEK) by the photoinduced graft polymerization of 2-methacryloyloxyethyl phosphorylcholine (MPC) without using any photoinitiators. The thus formed hydrophilic and smooth 100-nm-thick PMPC-grafted layer caused a significant reduction in the sliding friction of the bearing interface because the thin water film and hydrated PMPC layer acted as extremely efficient lubricants (so-called fluid-film lubrication or hydration lubrication). Fluid-film lubrication suppressed the direct contact of the counterbearing surface with the PEEK substrate and thus reduced the frictional force. A PMPC-grafted layer is therefore expected to significantly increase bearing durability. Furthermore, the PMPC-grafted layer shows unique phenomena, e.g., it prevents damage of the metal counter surface regardless of the carbon fiber content of CFR-PEEK. Smart PEEK using the self-initiated surface graft polymerization of MPC should lead to development of novel orthopedic bearings.

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On the kinetics and impact of tetragonal to monoclinic transformation in an alumina/zirconia composite for arthroplasty applications

Cited by 144 publications

References 13 publications

Selective etching of injection molded zirconia-toughened alumina: Towards osseointegrated and antibacterial ceramic implants

Selective etching of injection molded zirconia-toughened alumina: Towards osseointegrated and antibacterial ceramic implants

Development and mechanical characterization of novel ceramic foams fabricated by gel-casting

Smart PEEK Modified by Self-Initiated Surface Graft Polymerization for Orthopedic Bearings

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