Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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Kamila Iskhakova


Ostatnie publikacje
1.  Marek R., Ćwieka H., Donouhue N., Holweg P., Moosmann J., Beckmann F., Brcic I., Schwarze U. Y., Iskhakova K., Chaabane M., Sefa S., Zeller-Plumhoff B., Weinberg A., Willumeit-Römer R., Sommer N., Degradation behavior and osseointegration of Mg-Zn-Ca screws in different bone regions of growing sheep, regenerative biomaterials, ISSN: 2056-3418, DOI: 10.1093/rb/rbac077, Vol.rbac077, pp.26-60, 2022

Streszczenie:
Magnesium (Mg)-based implants are highly attractive for the orthopedic field and may replace titanium (Ti) as support for fracture healing. To determine the implant-bone-interaction in different bony regions, we implanted Mg-based alloy ZX00 (Mg < 0.5 Zn < 0.5 Ca, in wt%) and Ti-screws into the distal epiphysis and distal metaphysis of sheep tibiae. The implant degradation and osseointegration were assessed in vivo and ex vivo after 4, 6 and 12 weeks, using a combination of clinical computed tomography (cCT), medium-resolution micro CT (µCT) and high-resolution synchrotron radiation µCT (SRµCT). Implant volume loss, gas formation, and bone growth were evaluated for both implantation sites and each bone region independently. Additionally, histological analysis of bone growth was performed on embedded hard-tissue samples. We demonstrate that in all cases, the degradation rate of ZX00-implants ranges between 0.23-0.75 mm/year. The highest degradation rates were found in the epiphysis. Bone-to-implant-contact varied between the time points and bone types for both materials. Mostly, bone-volume-to-total-volume was higher around Ti-implants. However, we found an increased cortical thickness around the ZX00-screws when compared to the Ti-screws. Our results showed the suitability of ZX00-screws for implantation into the distal meta- and epiphysis

Słowa kluczowe:
Biodegradable implants,Magnesium-based alloys,Computed tomography,Mg-Zn-Ca,Sheep,Histology

Afiliacje autorów:
Marek R. - inna afiliacja
Ćwieka H. - IPPT PAN
Donouhue N. - inna afiliacja
Holweg P. - inna afiliacja
Moosmann J. - inna afiliacja
Beckmann F. - inna afiliacja
Brcic I. - inna afiliacja
Schwarze U. Y. - inna afiliacja
Iskhakova K. - inna afiliacja
Chaabane M. - inna afiliacja
Sefa S. - inna afiliacja
Zeller-Plumhoff B. - inna afiliacja
Weinberg A. - inna afiliacja
Willumeit-Römer R. - inna afiliacja
Sommer N. - inna afiliacja
40p.
2.  Zeller-Plumhoff B., Laipple D., Słomińska H., Iskhakova K., Longo E., Hermann A., Flenner S., Greving I., Storm M., Willumeit-Romer R., Evaluating the morphology of the degradation layer of pure magnesium via 3D imaging at resolutions below 40 nm, Bioactive Materials, ISSN: 2452-199X, DOI: 10.1016/j.bioactmat.2021.04.009, Vol.6, No.12, pp.4368-4376, 2021

Streszczenie:
Magnesium is attractive for the application as a temporary bone implant due to its inherent biodegradability, non-toxicity and suitable mechanical properties. The degradation process of magnesium in physiological environments is complex and is thought to be a diffusion-limited transport problem. We use a multi-scale imaging approach using micro computed tomography and transmission X-ray microscopy (TXM) at resolutions below 40 nm. Thus, we are able to evaluate the nanoporosity of the degradation layer and infer its impact on the degradation process of pure magnesium in two physiological solutions. Magnesium samples were degraded in simulated body fluid (SBF) or Dulbecco's modified Eagle's medium (DMEM) with 10% fetal bovine serum (FBS) for one to four weeks. TXM reveals the three-dimensional interconnected pore network within the degradation layer for both solutions. The pore network morphology and degradation layer composition are similar for all samples. By contrast, the degradation layer thickness in samples degraded in SBF was significantly higher and more inhomogeneous than in DMEM+10%FBS. Distinct features could be observed within the degradation layer of samples degraded in SBF, suggesting the formation of microgalvanic cells, which are not present in samples degraded in DMEM+10%FBS. The results suggest that the nanoporosity of the degradation layer and the resulting ion diffusion processes therein have a limited influence on the overall degradation process. This indicates that the influence of organic components on the dampening of the degradation rate by the suppression of microgalvanic degradation is much greater in the present study.

Słowa kluczowe:
magnesium degradation, porosity, transmission X-ray microscopy, 3D imaging

Afiliacje autorów:
Zeller-Plumhoff B. - inna afiliacja
Laipple D. - inna afiliacja
Słomińska H. - IPPT PAN
Iskhakova K. - inna afiliacja
Longo E. - inna afiliacja
Hermann A. - inna afiliacja
Flenner S. - inna afiliacja
Greving I. - inna afiliacja
Storm M. - inna afiliacja
Willumeit-Romer R. - inna afiliacja
200p.
3.  Meyer S., Wolf A., Sanders D., Iskhakova K., Ćwieka H., Bruns S., Flenner S., Greving I., Hagemann J., Willumeit-Römer R., Wiese B., Zeller-Plumhoff B., Degradation analysis of thin Mg-xAg wires using X-ray near-field holotomography, Metals, ISSN: 2075-4701, DOI: 10.3390/met11091422, Vol.11, No.9, pp.1422-1-12, 2021

Streszczenie:
Magnesium–silver alloys are of high interest for the use as temporary bone implants due to their antibacterial properties in addition to biocompatibility and biodegradability. Thin wires in particular can be used for scaffolding, but the determination of their degradation rate and homogeneity using traditional methods is difficult. Therefore, we have employed 3D imaging using X-ray near-field holotomography with sub-micrometer resolution to study the degradation of thin (250 μm diameter) Mg-2Ag and Mg-6Ag wires. The wires were studied in two states, recrystallized and solution annealed to assess the influence of Ag content and precipitates on the degradation. Imaging was employed after degradation in Dulbecco’s modified Eagle’s medium and 10% fetal bovine serum after 1 to 7 days. At 3 days of immersion the degradation rates of both alloys in both states were similar, but at 7 days higher silver content and solution annealing lead to decreased degradation rates. The opposite was observed for the pitting factor. Overall, the standard deviation of the determined parameters was high, owing to the relatively small field of view during imaging and high degradation inhomogeneity of the samples. Nevertheless, Mg-6Ag in the solution annealed state emerges as a potential material for thin wire manufacturing for implants.

Słowa kluczowe:
X-ray computed tomography, magnesium-silver alloy, wire, degradation, near-field holotomography

Afiliacje autorów:
Meyer S. - inna afiliacja
Wolf A. - inna afiliacja
Sanders D. - inna afiliacja
Iskhakova K. - inna afiliacja
Ćwieka H. - IPPT PAN
Bruns S. - inna afiliacja
Flenner S. - inna afiliacja
Greving I. - inna afiliacja
Hagemann J. - inna afiliacja
Willumeit-Römer R. - inna afiliacja
Wiese B. - inna afiliacja
Zeller-Plumhoff B. - inna afiliacja
70p.

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