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    Wyświetlanie 1-3 z 3
    Tytuł:
    The effect of heat treatment simulating porcelain firing processes on titanium corrosion resistance
    Autorzy:
    Sokołowski, G.
    Rylska, D.
    Sokołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/306670.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    odporność korozyjna
    polaryzacja potencjodynamiczna
    napalanie porcelany
    corrosion resistance
    potentiodynamic polarization
    porcelain firing
    titanium-ceramic dental restorations
    Opis:
    Purpose: Corrosion resistance of titanium used in metal-ceramic restorations in manufacturing is based on the presence of oxide layer on the metal surface. The procedures used during combining metallic material with porcelain may affect the changes in oxide layers structure, and thus anticorrosive properties of metallic material. The aim of the study was an evaluation of potential changes in the structure and selected corrosion properties of titanium after sandblasting and thermal treatment applicable to the processes of ceramics fusion. Methods: Milled titanium elements were subjected to a few variants of the processes typical of ceramics fusion and studied in terms of resistance to electrochemical corrosion. The study included the OCP changes over time, measurements of Icorr, Ecorr and Rp as well as potentiodynamic examinations. Surface microstructure and chemical composition were analyzed using SEM and EDS methods. Results: The results obtained allow us to conclude that the processes corresponding to ceramic oxidation and fusion on titanium in the variants used in the study do not cause deterioration of its anticorrosive properties, and partially enhance the resistance. This depends on the quality of oxide layers structure. Conclusions: Titanium elements treated by porcelain firing processes do not lose their corrosion resistance.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 93-102
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical passivation as a method of improving the electrochemical corrosion resistance of Co-Cr-based dental alloy
    Autorzy:
    Rylska, D.
    Sokołowski, G.
    Łukomska-Szymańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306992.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    odporność korozyjna
    stop stomatologiczny
    test elektrochemiczny
    pasywacja chemiczna
    corrosion resistance
    dental alloys
    electrochemical test
    chemical passivation
    Opis:
    Purpose: The purpose of the study was to evaluate corrosion resistance of Wirobond C® alloy after chemical passivation treatment. Methods: The alloy surface undergone chemical passivation treatment in four different media. Corrosion studies were carried out by means of electrochemical methods in saline solution. Corrosion effects were determined using SEM. Results: The greatest increase in the alloy polarization resistance was observed for passive layer produced in Na2SO4 solution with graphite. The same layer caused the highest increase in corrosion current. Generally speaking, the alloy passivation in Na2SO4 solution with graphite caused a substantial improvement of the corrosion resistance. The sample after passivation in Na2SO4 solution without graphite, contrary to others, lost its protective properties along with successive anodic polarization cycles. The alloy passivation in Na3PO4 solution with graphite was the only one that caused a decrease in the alloy corrosion properties. The SEM studies of all samples after chemical passivation revealed no pit corrosion – in contrast to the sample without any modification. Conclusions: Every successive polarization cycle in anodic direction of pure Wirobond C® alloy enhances corrosion resistance shifting corrosion potential in the positive direction and decreasing corrosion current value. The chemical passivation in solutions with low pH values decreases susceptibility to electrochemical corrosion of Co-Cr dental alloy. The best protection against corrosion was obtained after chemical passivation of Wirobond C® in Na2SO4 solution with graphite. Passivation with Na2SO4 in solution of high pH does not cause an increase in corrosion resistance of WIROBOND C. Passivation process increases alloy resistance to pit corrosion.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 73-78
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of hippotherapeutic exercises with larger support surface in development of balance in boys aged 15 to 17 years with mild intellectual disability
    Autorzy:
    Ambroży, T.
    Mazur-Rylska, A.
    Chwała, W.
    Ambroży, D.
    Mucha, T.
    Omorczyk, J.
    Ostrowski, A.
    Mucha, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307283.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    parametry stabilograficzne
    równowaga
    hipoterapia
    niepełnosprawność
    stabilographic parameters
    balance
    hippotherapy
    intellectual disability
    mild intellectual disability
    Opis:
    Purpose: Maintaining balance in humans involves continuous changes in parameters. The aim of this study was to assess the effect of hippotherapeutic exercises on development of the sense of balance in boys aged 15 to 17 years with mild intellectual disability. Methods: The study examined 50 randomly chosen boys aged 15 to 17 years with mild intellectual disability from the special education centre in Leżajsk, Poland. The study participants were divided into two groups: experimental group, who participated for 3 months in hippotherapeutic classes and the control group, with boys attending outdoor or indoor physical education classes. Before and after completion of the study, both experimental and control groups were diagnosed by means of Accu SwayPlus force plate. The force plate was used to determine alterations in the position of the centre of pressure (COP) on the platform in the frontal and sagittal planes in relaxed standing position with feet spread to the shoulder width and with eye control with respect to the base of support (BOS). The description was based on mean displacement of the centre of gravity (COG), mean velocity of displacements of the COG, mean radial displacement and total length of the COP pathway. Results: In the experimental group, equestrian exercises induced a series of significant changes that pointed to the improved balance reactions. The character of these changes in the positions analysed was similar: values of body sway in the sagittal plane and their range and mean displacements decreased statistically significantly after training. The same tendency was observed for mean radial displacements in the free open position and with closed support surface. Furthermore, the velocity of displacement and the length of the COP’s projection pathway on the support surface in the free open position was also reduced. All significant changes and trends found for the experimental group, which occurred after 3 month of hippotherapeutic classes, suggest improved parameters of balance. Conclusions: The lack of changes in balance parameters in the control group shows that the hippotherapeutic classes significantly develop balance abilities in boys aged 15 to 17 years with mild intellectual disability.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 4; 143-151
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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