We have studied the interstitialcy mechanism for interstitial cation diffusion in L i z 0 and JiCI. First, we have checked and validated the applicability of the ionic approximation and the reliability of the pair-potenrial technique for the investigation of interstitial cation diffusion in ionic crystals. For these purposs we calculated the electronic structure and optical absorption energies for these ions, and compared the atomic structure calculated quantum-chemically with that calculated employing the pairpotential technique. Secondly we have shown that the interstitialcy mechanism is very effective because of the relatively small additional displacements of Ions on moving from the initial configuration to the barrier point in compact sublattices, such as the cation sublatlice in Liz0 or in LiCI. n i s results from the favourable lattice distortion around the interslitial ion. In addition we repon a comparison of results obtained using the MOLSC4T Molt-Littleton code on CaF2 with earlier calculations that employed the HADES program, and obtain a satisfactory measure of agreement between the two sets of calculations.

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The aim of the study was to test an innovative implant made of the urethane bone-replacing material Rekost-M using 3D technologies for customized reconstruction of post-craniotomy skull defects. Materials and Methods. To study the properties of the bone replacement material Rekost-M, physical, mechanical and toxicological tests, as well as preclinical studies on fibroblasts cultures and lab animals (rabbits) were carried out. Clinical evaluation of the developed implant was conducted within a multicenter trial. Results. The replacement of post-craniotomy skull defects with implants made of the bone replacement material Rekost-M represents a reliable method of cranioplasty. Using 3D technology allows for modeling of individual implants of any complexity.