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Content available remote Three-dimensional finite element simulation of intrusion of the maxillary central incisor
Ryniewicz W., Ryniewicz A. M., Bojko Ł., Pełka P., Filipek J., Williams S., Loster B. W.
Biocybernetics and Biomedical Engineering
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2016
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Vol. 36, no. 2
385--390
EN
Purpose: The aim of this study is to generate a global digital model of treatment, analysis of stress distribution and displacements: in a construction of the bracket, in the incisor with bonded bracket, in tissues of the incisor, in a periodontal membrane and in an alveolus. Methods: An orthodontic therapy was provided with a three-dimensional model of a unique Cannon Ultra bracket. The placement of the bracket to the incisor was provided according to clinical standards. Composite material was placed between the rough surface of the bracket's base and labial incisor surface – which, in a digital model, resulted in contact without displacement. The bracket was loaded. An orthodontic arch wire was free to move in a wing slot of the bracket. For simplification, a force vector was parallel to the longitudinal axis of the incisor. A clamper was set on the surface of the cortical bone of the alveolus. The model was divided into a finite number of tetrahedral elements. To calculate the distribution of stress Ansys Workbench software was used. Results: The stress values indicate that there were no tissue overloaded areas. The stress distribution was regular in the periodontal ligament. Slight movements were observed with maximal values in the area of apex. Conclusions: This study simulation proves that tissues surrounding the tooth were influ-enced mechanically by the force loaded on the bracket. [...]
2
Content available remote Investigation of microstructure of bone tissue in mandibles of newborn rats after maternal treatment with antiretroviral drugs
Filipek J., Binkowski M., Maciejewska K., Drzazga Z., Wróbel Z.
Biocybernetics and Biomedical Engineering
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2015
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Vol. 35, no. 1
54--63
EN
High-resolution imaging has become a powerful tool for measurements in clinics, laboratory and animal studies, etc. In the present study, we aimed to investigate age related changes in bone development, and the effect of two antiretroviral agents (zidovudine and indinavir), which were administered during pregnancy, on the microstructure and bone mineral density (BMD) in newborn rats (7-, 14- and 28-day-old), with the use of X-ray microcomputed tomography (XMT). Fifty-four mandible bones were collected and divided into 3 groups: group 1 and 2: newborns after maternal treatment of zidovudine and indinavir respectively, group 3: control animals. The specimens were XMT scanned with the resolution of 7 μm and with a density phantom. Histomorphometric parameters and BMD were calculated to assess bone development depending on the administered drug. A statistical analysis was carried out to compare the differences among the control, zidovudine and indinavir groups. The analysis of the microstructure revealed disturbances in the development of the bone tissue in newborn rats. Indinavir seems to have a greater impact on bone microstructure than zidovudine.
3
Content available remote Wstępne badania wpływu odcieków ze składowiska odpadów w Jarosławiu na jakość wód rzeki San
Koszelnik P., Filipek J.
Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
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2011
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z. 58, nr 4
107-115
PL
Praca stanowi analizę wpływu nieczynnego składowiska odpadów w Jarosławiu na jakość wód pobliskiej rzeki San. Zidentyfikowano wyższe stężenia azotu amonowego oraz wartości ChZTMn, BZT5 i przewodności w wodach rzeki poniżej składowiska, co może sugerować dopływ odcieków. Nie stwierdzono jednak istotnego pogorszenia się jakości wód rzeki. Na podstawie pozostałych badanych wskaźników wpływu takiego nie stwierdzono.
EN
The paper contains an analysis of the impact of the inactive landfill in Jarosław on water quality nearby river San. Identified that higher concentrations of ammonia nitrogen and the value of CODMn, BOD5 and conductivity in the river below the landfill, which may suggest flow of leachate. However, significant deterioration in the quality of river water was not observed. On the basis of other indicators examined such an effect was not found.
4
Zastosowanie żeliwa sferoidalnego obrabianego cieplnie na odlewane części maszyn rolniczych, odpornych na ścieranie
Senberger J., Buchal A., Filipek J., Brezina R., Kouril M.
Odlewnictwo - Nauka i Praktyka
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2005
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R. 7, nr 6
48-52
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