From the time when Per-Ingvar Brånemark discovered oseointegration properties of titanium in 1952 a large-scale studies on the issue of usability this metal in surgery were started. Thanks to the parallel research conducted on independent centers managed to get a number of metal alloys which were implanted into the human body in the form of implants. Among the alloys produced appeared alloy of aluminum and vanadium Ti6Al4V. The mechanical properties, high biocompatibility, low density and for this relatively low-cost, caused that the alloy began to be used as a material for biomedical applications. In the present article analyzed the possibility of modifying the properties of the alloy, by choosing another method of producing – method of injection casting with suction. A comparative analysis of the input material - the alloy commercially produced in the form of a rod of the same material melted by injection under vacuum and in air were carried out. The studies results indicate that using method of injection casting with suction to produce the final item influence on significant improvement in mechanical properties as a result of fragmentation of the grains at the element surface. The mechanical properties play a key role in a tissue-implant-bone system.
The paper presents the affect of temperature and time of annealing on the thickness of the obtained oxide layer on the surface of titanium alloy Ti6Al4V and also on the geometry of the layer. The studies on seven samples where they were determined from 1 to 7 were carried out. Sample 1 was a reference sample of material that was subjected to the following parameters: for the sample 2 the temperature 350 �C in 5 hours, for the samples 3 and 4 450 �C and in sequence 1 and 10 hours, for the sample 5 and 6 550 �C and in sequence 1 and 10 hours and for the sample 7 temperature 650 �C in 5 hours. Studies have shown that thicker oxide layers with less surface development form on samples occurred after longer heat treatment and higher temperatures. Thanks to these dependencies it is possible to maneuver the time and temperature of the treatment interchangeably, eg. by raising the temperature of annealing time can be shortened to obtain similar parameters of the roughness profile as for the sample processed at a lower temperature in a longer time.
In this paper the results of corrosion resistance for dentistry implants � commercial and produced by injection casting were presented. The produced and commercial implants were made from the same material (Ti6Al4V ELI). Studies were carried out on six samples: two were input materials (E1, E2), two were commercial implants (C1, C2) and two were produced implants (P1, P2) where P1 was produced from input material E1 and P2 was produced from input material E2. For corrosion resistance potentiodynamic studies were carried out. It was found that produced samples through injection casting have better corrosion resistance than commercial implants. However, produced implants have similar corrosion resistance to input materials. The studies have shown that it is possible to use innovative injection casting to improve corrosion resistance of dental implants.
Purpose: The paper presents the possibility to improve the mechanical properties of dental implants produced of Ti6Al4V titanium alloy and possibility to use a new method to production those implants. The aim of the study was a comparison of properties of the feed materials, produced and commercial implants made of Ti6Al4V. Design/methodology/approach: The innovative injection methods was used. The comparison of microstructures and microhardness were carried out. Findings: It was shown that the use of new injection methods in the dental implant producing process effects on their structure and thus their mechanical properties. It has been observed that implants manufactured in comparison to commercial implants have a varied structure which is changing from the surface of the implant to its core. These changes are associated with a producing method that ensures very rapid heat dissipation from the surface of the manufacturing element. Research limitations/implications: During the production of the implants, problems have been encountered with keeping the alloy clean may occur. Practical implications: Injection method can be used as a method for commercial production of dental implants. Originality/value: The paper presents the results of microstructure and mechanical properties of dental implants – produced by new injection method.
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