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The modern approach to the recovery of damaged and missing bone tissue is increasingly focused on the application of implants capable of supporting the growth and recovery of parent tissue, rather than replacing the tissue itself. In this regard, the primary task of modern bone implants is to enable the targeted deformation of the implant against the expected load that that piece of bone should bear. The paper presents research related to anatomically shaped lattice scaffolds (ASLSs) made by the direct metal laser sintering (DMLS) of Ti-6Al-4V powder, and refers to the influence of the crossing angle between the outer lattice struts on the rigidity of the scaffold structure. The study includes the measurement of the deformation of two ASLSs designed for the same missing piece of rabbit tibia; these differed in terms of the crossing angle of the struts in the outer lattice and were exposed to quasi-uniaxial compression. The results show that the ASLS with outer struts that intersect at 60° (the angle between the compression direction and the strut axes is 30°) is more flexible compared to the ASLS with outer struts that intersect at 90° (the compression direction and the strut axes are colinear), even though its porosity is lower and volume is bigger. [ABSTRACT FROM AUTHOR]

This study investigates the elasticity of specific lattice structures made from titanium alloy (Ti6Al4V), namely, anatomically shaped lattice scaffolds (ASLS) aimed for reinforcement of the bone tissue graft that substitute a missing piece of the previously injured bone during its recovery. ASLSs that were used for testing were fabricated using the Electron Beam Melting (EBM) method. The mechanical properties of the ASLS were examined through uniaxial compression tests. Compression testing revealed the complex non-linear behavior of the scaffold structure's elasticity, with distinct compression stages and deformation dependencies. The ASLS structures exhibited quasi-elastic deformation followed by the rupture of individual struts. Results demonstrate that the ASLSs can be stiffened by applying appropriate compression load and accordingly achieve the target elasticity of the structure for the specific load range. The modulus of elasticity was determined for different compression stages of ASLS, allowing interpolation of the functional relation between the modulus of elasticity and compressive force that is used for stiffening the ASLS. This study enhances the understanding of the mechanical behavior of the specific lattice structures made of Ti6Al4V and provides insights for the development of mechanically optimized anatomically shaped lattice scaffolds. [ABSTRACT FROM AUTHOR]

The author examines the character of the changes taking place in contemporary Serbian society. He emphasizes at the same time that contemporary Serbian philosophy is facing these crucial questions as well, which without it cannot be even addressed, let alone solved. The key difference between modern West European and contemporary Serbian societies, seen from the perspective of philosophy, is demonstrated most clearly in the manner of constituting institutions and transforming the modern Serbian society. In the process of building modern institutions philosophy, not just in our country but throughout the Slavic East, has not had the role it played in Europe. Here lies the explanation why natural consciousness and an original ethos, though considerably modified, still remain unadapted and today represent a major obstacle to the establishment of the rule of European law. Without a change in the sense of justice and respect for the law it is impossible to accomplish the transformation of the society in which the law recognized by a democratic state could not be super ordinate to any reason. The crucial role of philosophy in this process is seen by the author not only in establishing modern European institutions and acceptance of the principle of European legislation, but above all in its influence on the transformation of the original ethos and establishment of new criteria on which the reflection, decision making and action of any individual would be based. .