The main purpose of the research was to analyze the influence of surface modification of the cobalt-based alloy used in dental prosthetics by applying zirconium oxide (ZrO2) layers using the ALD (Atomic Layer Deposition) method. The samples were made using the DMLS (Direct Metal Laser Sintering) technique, and their surfaces were prepared in accordance with the principles of removable partial dentures (RPDs). A 50 nm-thick zirconium oxide coating was applied to the prepared substrates. This paper deals with the issues of prosthetic stomatopathy, which is a complex of pathological changes occurring in approx. 40% of the Polish population using removable dentures. Often, these changes, occurring on the mucosa, are related to improper performance, allergic reactions or the multiplication of bacteria on the surface of partial dentures. An innovative method of surface modification was proposed, together with the analysis of its influence on the physicochemical properties of the alloy and the adhesion of bacteria to the surface.
The aim of the work was evaluation of electrochemical properties of Co-based alloys (Remanium GM 800+ and Biosil F) and Ni-based alloys (Heraenium NA and Remanium G-Soft) commonly used on frameworks for porcelain faced cast partial dentures. First stage of the work was evaluation of surface roughness by means of direct linear contact measurement (SURTRONIC 3+ profiler, Taylor/Hobson) of samples after casting and surface treatment. Electrochemical properties of surface were assessed by means of potentiodynamic and impedance methods. In potentiodynamic tests, in order to evaluate pitting corrosion resistance of the analyzed alloys, anodic polarization curves were recorded. The VoltaLab® PGP 201 system was applied in corrosion tests. Moreover, in order to evaluate structure and properties of the surface layer the electrochemical impedance spectroscopy (EIS) was applied. Selection of this method enabled to determine the impedance of the material – surface layer – solution interface with the use of approximation of impedance data by means of equivalent electric circuit model. The EIS tests were carried out with the use of the AutoLab PGSTAT 302N system equipped with the FRA2 Faraday impedance module. Electrochemical tests were carried out in artificial saliva at the temperature of 37°C and pH = 7,0±0,1.
Wprowadzenie. Współczesne postępowanie kliniczne i laboratoryjne w zakresie wykonawstwa stałych uzupełnień protetycznych opartych na wszczepach stomatologicznych, jak również oczekiwania pacjenta, podążają w kierunku uzyskania coraz lepszych efektów estetycznych i biomechanicznych. Rozwój materiałoznawstwa stomatologicznego prowadzi do sukcesywnej eliminacji stopów metali z protetyki stomatologicznej. Zastosowanie tlenku cyrkonu w wykonawstwie indywidualnych łączników implantologicznych wprowadziło możliwość zastosowania elementów biokompatybilnych oraz wykluczenia częstego defektu estetycznego, jakim było przeświecanie szarości w okolicy dziąsła brzeżnego, związanej z kolorem łącznika, szczególnie przy cienkim biotypie dziąsła. Badania twardości i chropowatości tlenku cyrkonu stosowanego w wykonawstwie łączników implantologicznych Assessment of the microhardness and roughness of zirconium oxide used in the production of individual ceramic implant abutments
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