Hydrogel based matrices and titanium dioxide (TiO2) nanoparticles (NPs) are well established materials in bone tissue engineering. Nevertheless, there is still a challenge to design appropriate composites with enhanced mechanical properties and improved cell growth. Progressing in this direction, we synthesized nanocomposite hydrogels by impregnating TiO2 NPs in a chitosan and cellulose-based hydrogel matrix containing polyvinyl alcohol (PVA), to enhance the mechanical stability and swelling capacity. Although, TiO2 has been incorporated into single and double component matrix systems, it has rarely been combined with a tri-component hydrogel matrix system. The doping of NPs was confirmed by Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and small- and wide-angle X-ray scattering. Our results showed that incorporation of TiO2 NPs improved the tensile properties of the hydrogels significantly. Furthermore, we performed biological evaluation of scaffolds, swelling degree, bioactivity assessment, and hemolytic tests to prove that all types of hydrogels were safe for use in the human body. The culturing of human osteoblast-like cells MG-63 on hydrogels showed better adhesion of cells in the presence of TiO2 and showed increasing proliferation with increasing amount of TiO2. Our results showed that the sample with the highest TiO2 concentration, CS/MC/PVA/TiO2 (1 %) had the best biological properties.
- MeSH
- celulosa farmakologie MeSH
- chitosan * farmakologie chemie MeSH
- hydrogely farmakologie chemie MeSH
- lidé MeSH
- nanočástice * chemie MeSH
- polyvinylalkohol chemie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Titanium is commonly and successfully used in dental and orthopedic implants. However, patients still have to face the risk of implant failure due to various reasons, such as implant loosening or infection. The risk of implant loosening can be countered by optimizing the osteointegration capacity of implant materials. Implant surface modifications for structuring, roughening and biological activation in favor for osteogenic differentiation have been vastly studied. A key factor for a successful stable long-term integration is the initial cellular response to the implant material. Hence, cell-material interactions, which are dependent on the surface parameters, need to be considered in the implant design. Therefore, this review starts with an introduction to the basics of cell-material interactions as well as common surface modification techniques. Afterwards, recent research on the impact of osteogenic processes in vitro and vivo provoked by various surface modifications is reviewed and discussed, in order to give an update on currently applied and developing implant modification techniques for enhancing osteointegration.
- Publikační typ
- časopisecké články MeSH
- přehledy MeSH
Cílem mé práce je prezentace kazuistiky pacientky s již dříve diagnostikovaným angiomyolipomem levé ledviny, která přichází na urologickou pohotovost pro akutně vzniklou bolest v oblasti levé ledviny při práci s teleskopickou pilou. Zjištěna ruptura tumoru s retroperitoneálním krvácením, jež řešena operační revizí a nefrektomií.
The goal of my work is to present a case report of the pacient firstly diagnosed with angiomyolipoma of the left kidney in past, who is now arriving to urological emergency due to acute made-pain in the left kidney, while was working with a telescopic saw. We found the ruptura of tumour with retroperitoneal bleeding has been already solved by operated revision and nephrectomy.
- Klíčová slova
- Wunderlichův syndrom,
- MeSH
- angiomyolipom * chirurgie komplikace MeSH
- lidé středního věku MeSH
- lidé MeSH
- nádory ledvin chirurgie komplikace MeSH
- nefrotomie MeSH
- spontánní ruptura * MeSH
- výsledek terapie MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- kazuistiky MeSH
