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Assessment of gold with titanium alloy weldability in conditions of a dental technique laboratory

Jania G., Żmudzki J., Topolska S.

Archives of Materials Science and Engineering

2022

Vol. 118, nr 1

36--41

Purpose: In dental practice, there is necessary to weld gold with titanium under the conditions of a dental technique laboratory, which is difficult. The aim was to assess the weldability of pure gold with the titanium alloy Ti6Al4V using a prosthetic laser welding machine. Design/methodology/approach: Gold wire in a diameter of 0.4 mm made with the use of a jewellery drawbar (GOLDPORT, Szczecin, Poland) was welded to a titanium alloy Ti6Al4V substrate of dental implant abutment screw (MegaGen). Dental laser welding parameters (Bego Laser Star T plus) were 230 V; 6.5 ms; 2.5 Hz; laser spot 0.3 mm, and argon blow. Samples were included in resin, ground (500-4000 SiC), polished (Al2O3 suspension) and etched (Kroll solution) per 20 s before observation under a light microscope. Findings: There were well-welded and poorly joined zones. The discontinuities and voids there were not visible or sparse next to the initial weld point. Dendritic structure at well-welded remelting zones and two-phase microstructure of titanium and Ti3Au phase were found. The heat-affected zone was about of 20 microns. Research limitations/implications: Light microscopy was used, and precise phase identification required further investigations. Weld strength assessment requires further micro-hardness and load-bearing ability tests. Weldability concerns the model system with pure gold. Practical implications: In the case of elements with dimensions below 0.4 mm, the use of a laser with a smaller spot should be considered for better control of the remelting zone and mechanical positioning of the elements in order to stabilize and avoid discontinuities and voids. Originality/value: Prosthetic laser welding with a laser spot about of 0.3 mm allows to obtain well-welded parts of 0.3 mm in diameter under stable stitching conditions and higher than 0.4 mm in dimensions.

Aspects of exploitation stability of selected dental prosthetic bridges

Jałbrzykowski M., Mystkowska J., Urban D., Kulesza E., Andrysewicz E.

Acta Mechanica et Automatica

2011

Vol. 5, no. 4

54-57

The paper presents results of microscopic observations of selected porcelain bridges prepared on metallic base. The aim of microscopic observations was the identification of example wear types which have appeared during dental prosthetic bridges exploitation. The main attention was directed to wear forms that are quite often present in case of such prosthetic elements. The wear types comparative analysis was evaluated. The most frequent types of wear are: material's cracking, abrasive wear. Also, the metal corrosion and wear by dental plaque at prosthetic bridge surface were observed.

Optimizing the shape of the prosthetic aortic leaflet valve

Konderla P., Patralski K.

Computer Assisted Mechanics and Engineering Sciences

2006

Vol. 13, No. 4

557-564

The object under study reported on in this paper was an aortic valve based on a natural aortic valve as the original. Simulations were carried out to examine the functioning of a valve which was loaded with varying pressure until a buckling of the leaflets and a fuli opening of the valve were observed. The aim of the study was the optimal choice of the geometrie and mechanical parameters for the class of construction assumed for analysis.