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1
Biokompatybilność utlenianego anodowo stopu Ti6Al4V ELI
Szewczenko J., Marciniak J., Tyrlik-Held J., Kiel M.
Inżynieria Materiałowa
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2011
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Vol. 32, nr 4
751-755
PL
Przedstawione w pracy wyniki badań stanowią próbę określenia wpływu wybranych, wstępnych zabiegów obróbki powierzchniowej na finalną biokompatybilność utlenianego anodowo stopu Ti6Al4V ELI. Proces utleniania anodowego poprzedzono kombinacją zabiegów modyfikacji powierzchni obejmującej szlifowanie, obróbkę wibracyjną i polerowanie elektrolityczne. Końcowym zabiegiem modyfikacji powierzchni była sterylizacja parowa. Zakres badań obejmował: pomiary chropowatości powierzchni, badania odporności na korozję szczelinową i wżerową w roztworze Ringera, określenie stężeń jonów pierwiastków metalicznych, które przeniknęły do roztworu po 28 dniach oraz obserwacje mikroskopowe powierzchni próbek. Wyniki przeprowadzonych badań wykazały istotny wpływ sposobu wstępnego, poprzedzającego proces anodyzacji, przygotowania powierzchni stopu. Wstępne przygotowanie powierzchni do anodyzacji jako proces wieloetapowy nie może być rozumiane wyłącznie jako pojedynczy zabieg bezpośrednio poprzedzający utlenianie anodowe. Wpływ na odporność korozyjną stopu mają bowiem wszystkie wcześniejsze zabiegi modyfikacji powierzchni poprzedzające proces anodyzacji.
EN
Results presented in the paper are an attempt of defining the influence of selected preliminary treatments of surface on the final biocompatibility of anodized Ti6Al4V ELI alloy. The anodization process was preceded by combination of different surface modification treatments including grinding, vibration machining and electropolishing. Steam sterilization was the final surface modification treatment. Range of research included: surface roughness tests, crevice and pitting corrosion investigations in Ringer's solution, determination of concentration of metallic elements which penetrated to the solution after 28 days exposition and microscopic observations of the specimens surface. The results of research have shown significant influence of preliminary methods of surface preparing which precede anodization. Preliminary preparing of the surface to anodization, as a multistage process, can not be understood solely as a single treatment which directly preceded anodization process. In fact, all the earlier treatments of surface modification before anodization have influence on corrosion resistance.
2
Content available Zastosowanie elektrochemicznej spektroskopii impedancyjnej do oceny własności fizykochemicznych stopu Ti-6Al-4V o modyfikowanej powierzchni
Kiel M., Marciniak J., Walke W., Szewczenko J.
Engineering of Biomaterials
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2011
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Vol. 14, no. 106-108
159--163
3
Content available remote Numerical and experimental analysis of spine’s transpedicular stabilizer
Kiel M., Marciniak J., Basiaga M., Szewczenko J., Kus W., Kokot G., Wadek T.
Journal of Achievements in Materials and Manufacturing Engineering
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2010
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Vol. 41, nr 1-2
124-130
EN
Purpose: The aim of the work was a numerical and experimental analysis of spine’s transpedicular stabilizer on lumbar part of spine. The result of the analysis was determination of displacements of the stabilizers’ elements. Design/methodology/approach: To define numerical characteristic of the lumbar spine – transpedicular spine stabilizer system, the finite element method was applied. Geometrical models of lumbar part of spine and transpedicular stabilizer were discretized by SOLID95 element. The boundary conditions imitating phenomena in real system with appropriate accuracy were established. The experimental analysis was carried out for spine’s transpedicular stabilizers which were implanted on lumbar part of pig spine. The analysis was realized by means of testing machine MTS Insight with the use of videoextensometer. Numerical and experimental analysis were carried out for stabilizer made of stainless steel Cr-Ni-Mo. System was loaded by uniaxial compression with forces from 50 N to 1600 N. Findings: The result of analysis was calculation of relative displacements of the transpedicular stabilizer in a function of the applied loading; F = 700 - 1600 N for numerical model and F = 50 - 1600 N for experimental model. Research limitations/implications: The results of numerical analysis for transpedicular stabilizer obtained by finite element method were used to determine a construction features of the stabilizer, and to select mechanical properties of metallic biomaterial. The calculation of displacements for stabilizer show that the proposed type of stabilizer enables correct stabilization of spine. Practical implications: Both results of numerical and experimental analysis showed correct selection of mechanical properties of metallic biomaterial which were used to made the proposed type of transpedicular stabilizer. Originality/value: Advantageous results of analysis showed that the type of stabilizer may be used in clinical practice.
4
Content available Analiza naprężeń i przemieszczeń układu stabilizującego kręgosłupa
Kiel M., Marciniak J., Basiaga M., Szewczenko J.
Engineering of Biomaterials
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2010
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Vol. 13, no. 96-98
44--48
5
Content available Analiza numeryczna płytkowego stabilizatora kręgosłupa z wykorzystaniem MES
Kiel M., Marciniak J.
Aktualne Problemy Biomechaniki
|
2010
|
z. 4
97--102
PL
Celem pracy było przeprowadzenie analizy numerycznej płytkowego stabilizatora zaimplantowanego na odcinku lędźwiowym kręgosłupa zdrowego oraz z postępującą osteoporozą. Efektem przeprowadzonej analizy było wyznaczenie wartości przemieszczeń względnych oraz naprężeń zredukowanych układu odcinek lędźwiowy kręgosłupa - stabilizator płytkowy. Analizę przeprowadzono dla dwóch rodzajów biomateriałów metalowych stabilizatora. Uzyskane wyniki analizy numerycznej stanowią podstawę doboru własności mechanicznych biomateriału oraz cech geometrycznych stabilizatora.
EN
The aim of the work was numerical analysis of plate stabilizer implanted on lumbar part of both healthy and osteoporotic spine. The results of the analysis was determination of relative displacements and equivalent stresses in the system of lumbar part of spine - plate stabilizer. The analysis was carried out for the stabilizer made of two metallic biomaterials. The results of the numerical analysis are the basis for selecting mechanical properties of metallic biomaterials and geometrical features of the stabilizer.
6
Content available Analiza zmęczeniowa transpedikularnego stabilizatora kręgosłupa
Kiel M., Marciniak J., Basiaga M., Szewczenko J.
Engineering of Biomaterials
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2009
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Vol. 12, no. 89-91
237--239
7
Content available remote Biomechanical analysis of plate stabilization on cervical part of spine
Kiel M., Marciniak J., Szewczenko J., Basiaga M., Wolański W.
Archives of Materials Science and Engineering
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2009
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Vol. 38, nr 1
41-47
EN
Purpose: The main aim of the work was determination of biomechanical analysis of cervical spine – stabilizer system made of stainless steel (Cr-Ni-Mo) and Ti-6Al-4V alloy. Design/methodology/approach: To define biomechanical characteristic of the system the finite elements method (FEM) was applied. Geometric model of part of spine C5-C7 and stabilizer were discretized by SOLID95 element. Appropriate boundary conditions imitating phenomena in real system with appropriate accuracy were established. Findings: The result of biomechanical analysis was calculation of displacements and stresses in the vertebras and the stabilizer in a function of the applied loading: 50-300 N for the stabilizer made of stainless steel (Cr-Ni-Mo) and Ti-6Al-4V alloy. Research limitations/implications: The result of biomechanical analysis for plate stabilizer obtained by FEM can be use to determine a construction features of the stabilizer, and to select mechanical properties of metallic biomaterial and estimation of stabilization quality. The calculation of displacements for part C5-C7 show that the proposed type of stabilizer enables correct stabilization used to clinical apply. Practical implications: The results of biomechanical analysis showed correct mechanical properties used to made the plate stabilizer. Originality/value: The obtained numerical results should be verified in “in vitro” tests.
8
Content available Charakterystyka biomechaniczna dwusegmentowe j stabilizacji kręgosłupa na odcinku lędźwiowym
Kiel M., Basiaga M., Marciniak J., Szot Ł.
Aktualne Problemy Biomechaniki
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2009
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z. 3
93--98
PL
Celem pracy było przedstawienie charakterystyki biomechanicznej płytkowych stabilizatorów kręgosłupa wykorzystując MES. Analizę przeprowadzono dla stabilizatorów wykonanych ze stali Cr-Ni-Mo oraz stopu Ti- 6A1-4V. Stabilizacji poddano dwa segmenty ruchowe na odcinku L3-L5. Opracowane modele geometryczne lędźwiowego odcinka kręgosłupa oraz płytkowego stabilizatora kręgosłupa poddano dyskretyzacji elementem typu SOLID95. Wynikiem analizy było wyznaczenie stanu przemieszczeń oraz naprężeń w poszczególnych elementach rozpatrywanego układu w funkcji obciążenia (F = 2000 - 5000 N).
EN
The aim of the work was determination of biomechanical characteristic of the plate stabilizers of spine using the finite elements methods. The analysis were carried out for the stabilizers made of stainless Steel (Cr-Ni- Mo) and alloy Ti-6A1-4V. The stabilization was realized in L3-L5 segment of spine. Geometric model of lumbar spine and plate stabilizer were discretized by SOLID 95 element. The result of the analysis was calculation of stresses and displacements in particular elements of considered system in a function of the applied loading (F = 2000 - 5000 N).
9
Content available remote Corrosion behaviour of metallic biomaterials used as orthodontic wires
Ziębowicz A., Walke W., Barucha-Kępka A., Kiel M.
Journal of Achievements in Materials and Manufacturing Engineering
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2008
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Vol. 27, nr 2
151-154
EN
Purpose: The aim of the work was evaluation of the corrosion resistance of the commercial metallic orthodontic wires from different manufacturers in simulated intra-oral environment. Design/methodology/approach: Corrosion resistance tests were carried out in artificial saliva at the temperature 37 ± 1° C with the use of the VoltaLab ® PGP 201 system for electrochemical tests. The saturated calomel electrode (SCE) was applied as the reference electrode and the auxiliary electrode was a platinum foil. The evaluation of pitting corrosion was realized by recording of anodic polarization curves with the use of the potentiodynamic method. In order to evaluate crevice corrosion resistance the samples were polarized in the potential equal to 0.8 V by 900 seconds. Findings: Results of corrosion resistance tests of the CrNi, NiTi and CuNiTi wires showed comparable data of parameters obtained in the artificial saliva. Research limitations/implications: The obtained results show the influence of artificial saliva on the electrochemical corrosion of orthodontic wires. In order to demonstrate the higher risk of corrosion, which can have two consequences: a loss of the physical properties and the release of Ni ions (which have been shown to be toxic and the cause of allergic reactions) - additional research on fatigue corrosion should be carried out. Originality/value: The analysis of the obtained results show that that commonly used materials for making orthodontic wires (because of their interesting properties - elasticity and shape memory) can be used in different orthodontic treatment stages to correct numerous clinical conditions. The most favorable characteristics were observed for the new NiTi samples (American Orthodontics).
10
Content available remote Corrosion resistance of metallic implants used in bone surgery
Kiel M., Krauze A., Marciniak J.
Archives of Materials Science and Engineering
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2008
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Vol. 30, nr 2
77-80
EN
Purpose: The purpose of the research was analysis of influence of mechanical damages on the implants’ surface made of Cr-Ni-Mo steel on the pitting corrosion resistance. Analysis was performed for implants after different time of implantation applied for stabilization of the funnel chest and for stabilization bone fractures, as well as for intramedullary nails in the initial state. Design/methodology/approach: Research were performed on three groups of implants after different implantation time. Research were based on the potentiodinamic tests by recording the anodic polarization curves. The tests were performed in the Tyrode’s physiological solution. Findings: The research effect was determination the corrosion potential Ecorr and breakdown potential Eb for three groups of implants after different time of implantation and different mechanical surface damages. On the basis of investigation it was stated that for all implants the breakdown potential was in the range of Eb = +549 – +1017 mV and the corrosion potential was in the range of Ecorr = -143 – +103 mV. Research limitations/implications: The obtained results can be applied to comparing the effects of possible postoperative complications. They also show the relation between the damage of surface layers and implantation time. The values of corrosion and breakdown potentials indicate good corrosion resistance of the applied austenitic stainless steel. Practical implications: The essential influence on the corrosion resistance had the time of implantation and size of surface damages. The results of research of implants made of Cr-Ni-Mo austenitic stainless steel presents that the steel was performed quality requirements for metallic biomaterials used for tested implants. Originality/value: The work presents the results of pitting corrosion tests for metallic implants made of Cr-Ni- Mo steel in the initial state and after different implantation time.
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