This study shows that submicron/nanoparticles found in bacterial cells (S. aureus) incubated with polyurethane (a material commonly used for prostheses in odontostomatology) are a consequence of biodestruction. The presence of polyurethane nanoparticles into bacterial vesicles suggests that the internalization process occurs through endocytosis. TEM and FIB/SEM are a suitable set of correlated instruments and techniques for this multi facet investigation: polyurethane particles influence the properties of S. aureus from the morpho-functional standpoint that may have undesirable effects on the human body. S. aureus and C. albicans are symbiotic microorganisms; it was observed that C. albicans has a similar interaction with polyurethane and an increment of the biodestruction capacity is expected by its mutual work with S. aureus.

The modern way of life is rapidly transforming from an analog environment into a digital one. For the most part, these transformations are taking place in the field of healthcare and medicine. Dentistry is the branch of medicine in which digital transformation has provided opportunities for the implementation of tasks that were previously impossible for a practicing physician. Computerization made it easier for the dentist to diagnose, plan and treat and allowed him to transfer preventive measures to a new high level, thanks to "smart" gadgets. Dental and orthopedic treatment has reached a new engineering level, incomprehensible for the 20th century, in designing devices and prostheses, as well as facial epitheses, analyzing the durability of such structures. The machine production of dental products in the rapidly approaching future will undoubtedly make the use of expensive therapeutic and prophylactic devices and prostheses, as well as facial epitheses, economically affordable for the majority of the disabled population of the Russian Federation. The flow of new but, unfortunately, not always reliable scientific and educational information sometimes misleads researchers and dentists. The creation of the heading "Digital Dentistry" is aimed at sharing the experience of novice researchers and practicing dentists, as well as recognized specialists, reference in the field of digital dentistry. We hope that the information collected will be useful for the Unified Medical Information and Analytical System being formed, constantly updated with new arrays of information available to a wide range of users. This approach will bring dental care to a new, more effective level.

No abstract

No abstract

Aim:The aim of the present work was to compare the elastic properties and internal structure of 4 different CAD/CAM chairside materials, by the method of Scanning Impulse Acoustic Microscopy (SIAM).Methods:Four chairside CAD/CAM materials with different structures from hybrid ceramic (VITA Enamic, VITA Zahnfabrik), feldspatic ceramic (VITABlocs Mark II, VITA Zahnfabrik), leucite glass-ceramic (IPS Empress CAD, Ivoclar Vivadent) and PMMA (Telio CAD, Ivoclar Vivadent) were examined by Scanning Impulse Acoustic Microscope (SIAM).Results:The results of micromorphological research of CAD/CAM chairside materials using SIAM method showed differences between the internal structures of these materials. The internal structure of feldspatic and glass-ceramic samples revealed the presence of pores with different sizes, from 10 to 100 microns; the structure of polymer materials rendered some isolated defects, while in the structure of hybrid material, defects were not found.Conclusion:Based on the results obtained from the present study, in cases of chairside production of dental crowns, it would be advisable to give preference to the blocks of hybrid ceramics. Such ceramics devoid of quite large porosity, glazing for CAD/CAM crowns made from leucite glass-ceramic and feldspatic ceramic may be an option. For these purposes, commercially available special muffle furnace for clinical and laboratory individualization and glazing of ceramic prostheses were provided. Further studies are needed to confirm the evidence emerging from the present research.