Modern structural materials are represented by a variety of polymer materials used for dental patients’ rehabilitation. They differ not only in physico-chemical properties, but also in microbiological properties, which is one of the reasons why these materials are chosen. The study focused on the microbial adhesion of clinical isolates of normal (5 types), periodontopathogenic (2 types), and fungal (2 types) microbiotas to various materials based on polymethylmethacrylate (PMMA) intended for traditional (cold-cured and hot-cured polymers), computer-aided subtractive and additive manufacturing. A comparative analysis was carried out on the studied samples of polymer materials according to the microorganisms’ adhesion index (AI). The lowest level of microorganisms’ AI of the three types of microbiotas was determined in relation to materials for additive manufacturing. The AI of hot-cured polymers, as well as materials for subtractive manufacturing, corresponded to the average level. The highest level of microorganisms’ adhesion was found in cold-cured polymers. Significant differences in AI for materials of the same technological production type (different manufacturers) were also determined. The tendency of significant differences in the indicators of the microorganisms’ adhesion level for the studied polymer materials on the basis of the type of production technology was determined.

This research addresses the development of a formalized approach to dental material selection (DMS) in manufacturing removable complete dentures (RDC). Three types of commercially available polymethyl methacrylate (PMMA) grades, processed by an identical Digital Light Processing (DLP) 3D printer, were compared. In this way, a combination of mechanical, tribological, technological, microbiological, and economic factors was assessed. The material indices were calculated to compare dental materials for a set of functional parameters related to feedstock cost. However, this did not solve the problem of simultaneous consideration of all the material indices, including their significance. The developed DMS procedure employs the extended VIKOR method, based on the analysis of interval quantitative estimations, which allowed the carrying out of a fully fledged analysis of alternatives. The proposed approach has the potential to enhance the efficiency of prosthetic treatment by optimizing the DMS procedure, taking into consideration the prosthesis design and its production route.

Relevance. Microcirculation disorder is one of the leading mechanisms in the pathogenesis of inflammatory and degenerative periodontal diseases. Modern medicine assesses the blood flow by the Doppler ultrasound, which has some essential advantages for a researcher. However, the possibilities of interpreting Doppler ultrasound data remain scarcely enlightened in the scientific literature.Materials and methods. Forty patients of both sexes, aged 18–25 years, with clinically intact periodontium, underwent a Doppler ultrasound test to investigate microcirculation in the area of tooth 1.6 at the levels of free gingiva, attached gingiva and mucobuccal fold, to study the integral characteristics of a Doppler ultrasound of tissue blood flow. The obtained data were statistically analyzed using the method of principal component analysis.Results. The principal component analysis demonstrated that Vam and Qam were the parameters closest to the integral blood flow velocity, and the attached gingiva was the optimal point for transducer position.Conclusion. The principal component analysis allowed obtaining an integral parameter of blood flow velocity (PC 1) and its features in various areas of the periodontium on tooth 1.6. Further studies are necessary due to the possible variability of periodontal microcirculation on other maxillary and mandibular teeth.

Оптимизация и валидация режимов инактивации спор Bacillus subtilis в среде сверхкритического CO 2 : чистый газ, перекись водорода, надуксусная кислота