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The surface of two dental implant systems, "Nobel Biocare" and "Alpha BiO", and metal-containing nanoparticles, isolated from the tissues surrounding dental implants, has been investigated. The implant surface structure, the elemental and phase composition of particles, and their arrangement in the granulation tissue have been studied by X-ray tomography, transmission and scanning electron microscopy, z-contrast scanning transmission microscopy, electron diffraction, and energy-dispersive mapping, using microscopes Quanta 200-3D, FEI Тechnai Osiris at an accelerating voltage of 200 kV, and an X-ray microtomograph TOMAC. An analysis of the relief indicates that the emission of nanoparticles from the "Alpha BiO" implant surface to the adjacent tissues is more likely than from the "Nobel Biocare" implant surface. The particles of micrometer and submicrometer sizes of "Nobel Biocare" implants are found to consist mainly of titanium dioxide of both modifications, rutile and anatase, whereas in the case of "Alpha BiO" implants, along with titanium dioxide and titanium nitride, there are aluminum oxides in the particle composition. The elemental composition of nanoparticles is more diverse; it includes Fe, Ca, Na, Cl, S, Si, P, etc. It is revealed that microbial contamination does not always play the leading role in the suppression of previously obtained osteointegration. [ABSTRACT FROM AUTHOR]

Results are presented of photochemical experiments with an IR-laser unit for microsurgery and photodynamic therapy in dentistry. The efficiency of direct generation of singlet oxygen in model organic media in the continuous-wave and pulsed nanosecond modes is examined. The unit can serve both as an independent instrument and as a part of a complex for robot-assisted surgery and dentistry. [ABSTRACT FROM AUTHOR]

There are many data about the extremely low-frequency electromagnetic fields (ELF-EMF) therapeutic use, especially in the field of oncology. Recent data suggest that 4 Hz EMF having dehydration effect on tissues has a pronounced antitumor activity on sarcoma-180 in mice. It was shown that 4 Hz EMF have pronounced effects on physicochemical properties of water and water solution. Therefore, the aim of the present work was the comparative study of the modulation effect of ELF-EMF on cisplatin-induced changes cell hydration and number of ouabain receptors in membrane of sarcoma-180 tumor tissues. Tissue hydration was measured as wet weight/dry weight and expressed as a water content of g/g in dry weight. The number of H-ouabain receptors in membrane was counted by isotope scintillation counter. In conclusion, ELF-EMF can be a possible tool for stimulation of cisPt antitumor effect. [ABSTRACT FROM AUTHOR]