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Implantna trdnost treh ogljikovih konstrukcijskih jekel
Tomaž Vuherer, Vladimir Gliha, Anton Vavpotič, 2003, professional article

Abstract: V predstavljenem delu smo študirali občutljivost treh jekel za pokljivost v hladnem pri uporabi implant-preizkusov. Ta vrsta pokljivosti se pojavi v varu ali v toplotno vplivanem področju v odvisnosti od tega, kateri del zvara je bolj kaljiv. Odločilni dejavniki za pojav pokljivosti v hladnem so vodik, kaljene strukture in zaostale napetosti. Trajna implantna trdnost je prag napetosti, pri kateri pri danih pogojih ne pride do pokljivosti v hladnem v grobozrnatem delu toplotno vplivanega področja preizkušanega jekla. To smo določili pri jeklih CrNiMoV, CrMoV in SUMITEN 80 P pri različnih pogojih. Pri tej raziskavi je zmanjšanje vlage v dodajnem materialu in predgrevanje močno povečalo implantno trdnost.
Keywords: konstrukcijska jekla, zvarni spoji, implant preizkus, implantna trdnost, hladna pokljivost, TVP, var
Published: 01.06.2012; Views: 976; Downloads: 49
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Aspects of titanium-implant surface modification at the micro and nano levels
Iva Milinković, Rebeka Rudolf, Karlo Raić, Zoran Aleksić, Vojkan Lazić, Aleksandar Todorović, Dragoslav Stamenković, 2012, original scientific article

Abstract: The shape and chemical composition, as well as the macro- and microtopography, of an implant surface have been studied widely as the major factors that positively influence implant osseointegration. Titanium and titanium alloys have been used extensively over the past 20 years as biomedical materials in orthopedic and dental surgery because of their good mechanical properties, corrosion resistance, no cell toxicity, and very poor inflammatory response in peri-implant tissue, which confirms their high biocompatibility. Their favorable biological performance is attributed to a thin native oxide film that forms spontaneously on the titanium surface. It is well established that surface roughness plays an important role in implant fixation. Accordingly, some authors have indicated the existence of an optimal range of surface roughness. The titanium surface can be either chemically or physically modified, or both, in order to improve biomaterial-tissue integration. Different treatments are used to modify the titanium surface. Hydroxyapatite coatings, preceded or not by acid etching, are used to create a rough, potentially bioactive surface. Oxide blasting treatments, either with or without chemical etching, are used to develop roughsurfaces. Thick oxide films obtained by anodic or thermal oxidation have been used to accelerate the osseointegration process. The ideal microtopography of the surface is still unknown, however, because it is very difficult to associate surface properties with clinical results. As more accurate knowledge is required, several Ti surfaces have been analyzed and the endosseous implant surface modified on the micro level has been thoroughly studied. Additionally, the production of gold (Au) nanoparticles to be added to the micron-scale modified surface has been performed. In this respect, an appropriate overview of our results is given.
Keywords: Ti implant, Au nanoparticles titan alloys, surface modification, microstructure
Published: 10.07.2015; Views: 696; Downloads: 45
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Processing poly(ether etherketone) an a 3D printer for thermoplastic modelling
Bogdan Valentan, Žiga Kadivnik, Tomaž Brajlih, Andy Anderson, Igor Drstvenšek, 2013, original scientific article

Abstract: PEEK, poly(ether etherketone), is one of the high-quality industrial polymers. It is widely used in extremely demanding areas like automotive, aircraft and space industries. Because of the fact that it is bio-compatible, PEEK is also used for medical implants that are usually made by milling a block of the material. The article presents the results of an investigation of processing PEEK on a 3D printer for thermoplastic modelling. The used procedure is one of the additive manufacturing procedures and, as such, it builds a product by adding material layer by layer to get the finished product. Commercially available machines are unable to achieve the required melting and environment temperatures, so a new machine was developed. The machine was designed and built at the company Ortotip d.o.o. and it is able to produce the parts of up to 130 mm Ž 130 mm Ž 150 mm. After the initial testing, test specimens, according to standards EN ISO 527-2: 2012 and EN ISO 178: 2011, were produced and tested at the facilities of the PEEK manufacturer Invibio (from the UK). The article presents the steps taken when developing the PEEK modelling machine, the test methods to verify the mechanical properties of manufactured products and the results of the material testing. The machine was developed to produce medical implants (specific maxillofacial prosthesis), but with additional testing (that will help to improve the mechanical properties of produced parts) practically all bone-replacement implants can be made.
Keywords: PEEK, 3D printer, implant, medical application, thermoplastic, FDM, biocompatible, additive technology
Published: 17.03.2017; Views: 745; Downloads: 56
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