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Tytuł:
Rusztowania hydroksyapatytowe do zastosowań medycznych wykonane metodą “Robocasting” – wstępne testy
Hydroxyapatite scaffolds by “Robocasting” for medical applications – preliminary tests
Autorzy:
Gryń, K.
Chłopek, J.
Tematy:
HAp
Robocasting
rusztowania
scaffolds
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/285043.pdf  Link otwiera się w nowym oknie
Opis:
Artykuł prezentuje wyniki wstępnych badań przeprowadzonych na przestrzennych porowatych strukturach bioceramicznych - rusztowaniach hydroksyapatytowych - wykonanych metodą „Robocasting”. Badaniom poddano próbki o różnych wariantach geometrii strukturalnej przy zachowaniu tych samych wymiarów zewnętrznych. Własności wytrzymałościowe wyznaczono w próbie trójpunktowego zginania. Złożoną mikro i makro strukturę pokazano na zdjęciach wykonanych przy użyciu mikroskopu skaningowego i optycznego. Wykonano testy w środowisku SBF. Analiza wyników pokazała, że pomimo niskich własności wytrzymałościowych drukowane struktury przestrzenne mogą służyć do zastosowań medycznych. Wystarczająca sztywność, odpowiednia porowatość, a także biozgodność, pozwala na ich zastosowanie jako rusztowań dla komórek – skafoldów.
Preliminary results on three-dimensional porous bioceramic structures - hydroxyapatite scaffolds - are presented in this article. “Robocasting” was used as a fabrication method. Sets of prepared samples had the same outer diameter but different structure of macroporosity. 3-pts bending test was applied to reveal mechanical properties. Optical microscope and scanning electron microscope (SEM) pictures were taken for structural analysis of printed and sintered samples. Biological activity was tested in simulated body fluid (SBF). Analyses show that low mechanical properties of three-dimensional porous structures are not decisive and do not exclude such structures from medical applications. Sufficient stiffness, appropriate porosity and biocompatibility allow using them as scaffolds for bone cells growth.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrolytic method for obtaining porous chitosan structures with hydroxyapatit
Autorzy:
Tylman, Michał
Mucha, Maria
Tematy:
HAp
chitosan
electrolysis
electrolytic conductivity
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Powiązania:
https://bibliotekanauki.pl/articles/1035430.pdf  Link otwiera się w nowym oknie
Opis:
The aim of this study was to develop a preparation method of porous chitosan structures, in the electrolysis of the chitosan solution in acetic acid. Chitosan in aqueous acetic acid is a polyelectrolyte. During the constant flow of electric current through this system, pure chitosan begins to accumulate on an anode, in the form of porous hydrogel layers. The addition of hydroxyapatite (HAp) to the electrolyte enhances the process and allows for obtaining spatially arranged complex structures of chitosan.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomicroconcretes based on the hybrid HAp/CTS granules, α-TCP and pectins as a novel injectable bone substitutes
Autorzy:
Ślósarczyk, Anna
Cichoń, Ewelina
Czechowska, Joanna
Zima, Aneta
Dziadek, Michał
Opis:
In this work, novel bone substitutes in the form of biomicroconcretes with high surgical handiness and satisfactory mechanical properties were developed. Materials were composed of hybrid hydroxyapatite/chitosan (HAp/CTS) granules as aggregate, α-TCP as a setting phase, and pectin solutions as a liquid phase. Two types of low esterified amidated pectins from citrus peels (CP) and apple pomace (AP) and also two fractions of HAp/CTS granules of size between 300 and 400 µm and 400–600 µm were used. The presence of pectins significantly improved surgical handiness and allowed to obtain injectable biomicroconcretes. Synergistic effect of fast internal crosslinking of low esterified pectins, induced by Ca2+ released from α-TCP, together with setting reaction of highly reactive α-TCP (dual setting system) resulted in excellent cohesion of the final materials. By the use of different type of pectins (AP, CP) one can control mechanical properties of the materials. The results showed that pectins from citrus peels more effectively improved compressive strength. The biomicroconcretes obtained in this work showed great potential for the use as novel bone substitutes, however, they require further studies, especially biological evaluation.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Preparation and characteristics of polyurethane-based composites reinforced with bioactive ceramics
Autorzy:
Złocista-Szewczyk, Natalia
Szatkowski, Piotr
Pielichowska, Kinga
Tematy:
polyurethane
HAp
TCP
orthopaedics
bone regeneration
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/284882.pdf  Link otwiera się w nowym oknie
Opis:
The purpose of the study was to synthesize and characterize a series of porous polyurethane-based composites modified with β-tricalcium phosphate (TCP) and hydroxyapatite (HAp). The composites were obtained by the one-step bulk polyaddition method using poly(ethylene glycol) (PEG) as a soft segment, 4,4’-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO) as a chain extender and selected bioactive bioceramics. The obtained composites were characterized using FTIR, DSC, TG and SEM/EDX methods. Moreover, in vitro chemical stability and wettability tests were performed. The preliminary assessment of mechanical properties, porosity and in vitro chemical stability was performed. The test results showed that the best pore distributions, as well as Young’s modulus, were found for the hydroxyapatite--modified composites and PU/20% TCP. The wettability investigations revealed that the contact angle of PU composites was in the range 50-80°, which indicates the hydrophobic nature of the materials. The in vitro biostability studies confirmed that all tested compo-sites were chemically stable during incubation in the simulated body fluid. By using infrared spectroscopy the presence of urethane bonds and completion of reaction were evidenced. The results showed that the bioactivity of the materials was improved, which makes good perspectives for the obtained materials to be considered as potential scaffolds in bone tissue regeneration.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biocomatibility study of BOC polymer mesh enriched with HAp and TCP covered by PCL fibres
Autorzy:
Menaszek, E.
Ścisłowska-Czarnecka, A.
Draczyński, Z.
Bogun, M.
Stodolak-Zych, E.
Tematy:
polymer mesh
HAp
TCP
osteoblasts NHOst
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/286223.pdf  Link otwiera się w nowym oknie
Opis:
The study was conducted in order to determine the biocomatibility of polimer mesh based on BOC and enriched with HAp or TCP coverd by PCL sub-micrometric fibres. Human osteoblast cell line NHOst was cultured in standard conditions on disk-shaped polymer samples. Interactions between materials and cells were examined through microscopic observation of cells' adhesion and morphology, and tests of viability/proliferation and cytotoxicity. The study proved the biocompatibility of all examined materials, though the surface of TCP enriched polymer didn't promote the adhesion of cells.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and characteristics of polyurethane-based composites reinforced with bioactive ceramics
Autorzy:
Złocista-Szewczyk, Natalia
Szatkowski, Piotr
Pielichowska, Kinga
Tematy:
polyurethane
HAp
TCP
orthopaedics
bone regeneration
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/1844984.pdf  Link otwiera się w nowym oknie
Opis:
The purpose of the study was to synthesize and characterize a series of porous polyurethane-based composites modified with β-tricalcium phosphate (TCP) and hydroxyapatite (HAp). The composites were obtained by the one-step bulk polyaddition method using poly(ethylene glycol) (PEG) as a soft segment, 4,4’-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO) as a chain extender and selected bioactive bioceramics. The obtained composites were characterized using FTIR, DSC, TG and SEM/EDX methods. Moreover, in vitro chemical stability and wettability tests were performed. The preliminary assessment of mechanical properties, porosity and in vitro chemical stability was performed. The test results showed that the best pore distributions, as well as Young’s modulus, were found for the hydroxyapatite--modified composites and PU/20% TCP. The wettability investigations revealed that the contact angle of PU composites was in the range 50-80°, which indicates the hydrophobic nature of the materials. The in vitro biostability studies confirmed that all tested compo-sites were chemically stable during incubation in the simulated body fluid. By using infrared spectroscopy the presence of urethane bonds and completion of reaction were evidenced. The results showed that the bioactivity of the materials was improved, which makes good perspectives for the obtained materials to be considered as potential scaffolds in bone tissue regeneration.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Altitude Platform : Future of Infrastructure
Autorzy:
Malinowski, A.
Zieliński, R. J.
Tematy:
HAP
High Altitude Platform
rural area
infrastructure
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/226948.pdf  Link otwiera się w nowym oknie
Opis:
High Altitude Platform (HAP) concept and idea is presented in the article. Characteristics, advantages and disadvantages of HAPs are described. There is also the comparison available between HAPs and existing telecommunication infrastructure (terrestrial and satellite). Selected examples of the possible limitation and technological restrictions of HAP based systems are presented in the article.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of brittle fracture propagation behaviour of hydroxyapatite (HAp) coating in artificial femoral stem component
Autorzy:
Sheng, C.H.
Nagentrau, M.
Ibrahim, N.H.
Tematy:
hydroxyapatite (HAp)
fracture
stress intensity factor (SIF)
artificial femoral stem
hydroksyapatyt (HAp)
złamanie
współczynnik intensywności naprężeń
sztuczny trzon kości udowej
Pokaż więcej
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:
https://bibliotekanauki.pl/articles/2201136.pdf  Link otwiera się w nowym oknie
Opis:
Purpose: This study addresses the brittle fracture propagation behaviour modelling of hydroxyapatite (HAp) coating in artificial femoral stem component. Design/methodology/approach: A simple two dimensional flat-on-flat contact configuration finite element model consisting contact pad (bone), Ti-6Al-4V substrate and HAp coating is employed in static simulation. The HAp coating is modelled as elastic layer with pre-microcrack which assumed to be initiated due to stress singularity. Findings: The study revealed that reducing coating thickness, pre-microcrack length and artificial femoral stem elastic modulus along with increasing bone elastic modulus will result in significant stress intensity factor (SIF) to promote brittle fracture propagation behaviour. Research limitations/implications: The influence of coating thickness, pre-microcrack length, bone and artificial femoral stem elastic modulus on fracture behaviour is examined under different stress ratio using J-integral analysis approach. Practical implications: The proposed finite element model can be easily accommodating different Hap coating thickness, pre-microcrack length, bone and artificial femoral stem elastic modulus to perform detailed parametric studies with minimal costly experimental works. Originality/value: Limited research focussing on brittle fracture propagation behaviour of HAp coating in artificial femoral stem component. Thus, present study analysed the influence of coating thickness, pre-microcrack length, bone and artificial femoral stem elastic modulus on stress intensity factor (SIF) of HAp coating.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 16

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