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Porównanie skuteczności różnych metod wprowadzania porów do biomateriału na bazie ceramiki hydroksyapatytowej

Syta E., Kazimierczak P., Stadnicka G., Pałka K., Ginalska G., Przekora A.

Materiały Ceramiczne

2018

T. 70, nr 2

89--101

Wysoka makroporowatość biomateriału, która sprzyja procesowi angiogenezy, ma największy wpływ na dobrą osseointegrację implantu z kością pacjenta. W niniejszej pracy porównano skuteczność trzech różnych metod wprowadzania porów do biomateriału polimerowo-ceramicznego w celu wykorzystania go do zastosowań w medycynie regeneracyjnej kości. W ramach badań modelowy biomateriał zbudowany z agarozy i bioceramiki w postaci nanoproszku hydroksyapatytowego został wyprodukowany przy pomocy trzech alternatywnych metod z wykorzystaniem: 1. porogenów stałych (ang. porogen leaching, P-L), 2. gazu CO2 jako porogenu (ang. gas-foaming, G-F) i 3. procesu liofilizacji (ang. freeze-drying, F-D). Następnie porównano mikrostrukturę oraz porowatość otrzymanych biomateriałów. Wyniki badań wykazały, że biomateriał wytworzony metodą F-D posiada największą porowatość otwartą i całkowitą oraz charakteryzuje się obecnością porów zespolonych, które w warunkach ustrojowych stymulują proces angiogenezy. Ponadto technika F-D jako jedyna umożliwia równomierną dystrybucję porów w obrębie całej próbki.

High macroporosity of the biomaterial, which is crucial for the angiogenesis process, has a great impact on good osseointegration of the implant with patient bone. In this study, effectiveness of three various methods for pore introduction into polymer-ceramics biomaterial for potential bone regenerative medicine applications was compared. Within the research, a model biomaterial made of agarose and bioceramics in the form of nanohydroxyapatite powder was produced using: (i) a porogen leaching method (P-L), (ii) CO2 gas as a porogen (gas-foaming method, G-F), and (iii) the lyophilisation process (freeze-drying method, F-D). Then, the microstructure and porosity of fabricated biomaterials were compared. Obtained results demonstrated that the biomaterial produced by the F-D method possesses the highest open and total porosity as well as is characterized by the presence of network of interconnected pores, which in physiological conditions stimulates the angiogenesis process. Moreover, F-D technique is the only one that allows for uniform distribution of pores within whole volume of the sample.

Impact of sintering temperature of hydroxyapatite on biological and physicochemical properties of alginate/HA biomaterials for regenerative medicine applications

Kazimierczak P., Syta E., Sochan J., Ginalska G., Przekora A.

Engineering of Biomaterials

2018

Vol. 21, no. 145

16--19

Synthetic hydroxyapatite (HA) has gained considerable attention in regenerative medicine over recent decades. It is widely used as a bone filler and constituent of various biomaterials. HA possesses high biocompatibility, osteoconductivity, bioactivity, and bioresorbability. There are many different synthesis methods for HA described in the available literature. It is worth noticing that even slight changes in pH, reaction conditions or chemical composition during synthesis, can influence biological, physicochemical, and mechanical properties of resultant HA. The aim of this study was to evaluate the impact of sintering temperature of hydroxyapatite on biological and physicochemical properties of biomaterial made of alginate and hydroxyapatite granules. Alginate/HA material was produced using HA sintered at temperature of 800oC and HA sintered at temperature of 1150oC. Microstructure of the fabricated biomaterials was visualized by SEM. Osteoblast growth on the composites was assessed using human foetal osteoblast cell line. Moreover, ion reactivity, plasma/serum protein adsorption ability as well as water/NaCl uptake capability of the biomaterials were compared. Obtained results demonstrated that although both biomaterials had the same chemical composition, composite comprising hydroxyapatite sintered at temperature of 1150oC had smoother surface, revealed lower ion reactivity, was more favourable to osteoblast growth, and adsorbed lower amount of fibrinogen (which is known to promote biomaterial-induced inflammatory response), compared to the material made of hydroxyapatite sintered at temperature of 800oC. Thus, the type of bioceramics used for the production of biomaterials should be tailored to their specific applications – bone fillers for primarily in vivo implantation or in vitro cell-seeded scaffolds.