Lifetime estimation of a zirconia–alumina composite for biomedical applications

Fabbri, Paride; Piconi, C.; Burresi, Emiliano; Magnani, Giuseppe; Mazzanti, Francesca; Mingazzini, Claudio

doi:10.1016/j.dental.2013.10.006

Cited by 71 publications

(34 citation statements)

References 31 publications

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“…Although it has been reported that n is not a constant during the ageing process [39], non-complete sigmoidal surface transformation curves were widely used to linearly fit the curve of ln(ln(1/(1-f))) vs. ln(t) in literature [9][10][11]36]. Furthermore, the problem of a non-constant n parameter can be easily neglected if the time interval is too large when collecting the surface transformation data.…”

Section: Ageing Kinetic Constants S (Lm/h) Versus B (H à1 )mentioning

confidence: 98%

“…The kinetic parameter b (h À1 ) obtained from the surface phase transformation is commonly used in literature [9,11,36]. However, it does not have a clear physical meaning and only allows to predict the ageing behaviour together with the n parameter in the MAJ equation.…”

Section: Ageing Kinetic Constants S (Lm/h) Versus B (H à1 )mentioning

confidence: 99%

“…Up to now, most ageing kinetic parameter studies were based on surface t-to m-ZrO 2 phase transformation profiles measured by X-ray diffraction (XRD) and fitted according to the Mehl-Avrami-Johnson (MAJ) model [9][10][11][12][13][14]. Based on this method, the apparent ageing activation energy of 3Y-TZP was calculated to be about 106 kJ/mol [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lifetime estimation of zirconia ceramics by linear ageing kinetics

et al. 2015

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Section: Ageing Kinetic Constants S (Lm/h) Versus B (H à1 )mentioning

confidence: 98%

Section: Ageing Kinetic Constants S (Lm/h) Versus B (H à1 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lifetime estimation of zirconia ceramics by linear ageing kinetics

et al. 2015

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“…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%

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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“…In the past three decades, zirconia (ZrO 2 ) and alumina (Al 2 O 3 ) based implants witnessed significant attention in orthopedic and dental applications. A gradual evolution that is allied by the modern day demands alongside the individual shortcomings of ZrO 2 and Al 2 O 3 implants, zirconia toughened alumina (ZTA) emerge as an important candidate in recent years . ZTA owns the merit of high strength, excellent corrosion resistance and improved fracture toughness that usually arise from the sustained existence of metastable tetragonal zirconia ( t ‐ZrO 2 ) in Al 2 O 3 matrix …”

Section: Introductionmentioning

confidence: 99%

Structural, optical tuning, and mechanical behavior of zirconia toughened alumina through europium substitutions

Ponnilavan

Kannan

2018

J Biomed Mater Res

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The structural and optical features of zirconia toughened alumina (ZTA) due to the assorted range of Eu 3+ substitutions are demonstrated. The characterization studies affirm the pivotal role of Eu 3+ on the improved structural stability of ZTA and associated tetragonal zirconia (t-ZrO 2 ) ! cubic zirconia (c-ZrO 2 ) transformation. Eu 3+ prefers accommodation at the lattice sites of ZrO 2 and their gradual accumulation induces t-! c-ZrO 2 transition. Beyond the substitution limit, Eu 3+ reacts with Al 2 O 3 to form EuAlO 3 . Optical studies validate typical Eu 3+ emissions, and further, the emission spectrum also predicts the symmetry of Eu 3+ coordination at the ZrO 2 lattice. Uniform distribution of ZrO 2 and Al 2 O 3 grains throughout the microstructures are evident from the morphological analysis. Further, the influence of Eu 3+ on the enhanced mechanical stability of ZTA is ensured from indentation technique.

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Lifetime estimation of a zirconia–alumina composite for biomedical applications

Cited by 71 publications

References 31 publications

Lifetime estimation of zirconia ceramics by linear ageing kinetics

Lifetime estimation of zirconia ceramics by linear ageing kinetics

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

Structural, optical tuning, and mechanical behavior of zirconia toughened alumina through europium substitutions

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