Features of physical and mechanical parameters of acrylic plastics after fullerene coating.

OBJECTIVE: The aim of the research is to study the physical and mechanical parameters of the bases in removable laminar dentures after modification of their surface. PATIENTS AND METHODS: Materials and methods: the studied samples were divided into two groups (group I - acrylic plastics, and group II - acrylic plastics with fullerene С60 nanocoating), 50 samples in each group. The coefficients of water absorption, water solubility, microhardness and deformation characteristics of materials were studied. RESULTS: Results and conclusions: The material covered with fullerene С60 has a lower coefficient of water absorption and water solubility, which amounted to 0.55% and 0.23% respectively, from the initial weight of samples, as compared with acrylic plastics without coating (0.71% and 034%, respectively). The strength parameters of samples of group ІІ were higher by 13.5% as compared to group І. The given results of water absorption and water-solubility show that acrylic plastics with fullerene С60 molecules coating has a lower coefficient of water absorption and water solubility, in comparison with acrylic plastics without coating. This indicates a higher degree of resistance to biodegradation of the modified surface material, in turn reducing the washing-out of residual monomer from the denture, which directly improves the strength parameters of the acrylic plastics and can prevent the development of denture stomatitis.

The scientific and pedagogical heritage of doctor N.I. Pirogov.

OBJECTIVE: The aim: was toanalyze the scientific and pedagogical heritage of N.I. Pirogov, which remains relevant in the modern medical and pedagogical community, and opens new little-known pages of the scientific, pedagogical and medical activity of the doctor. PATIENTS AND METHODS: Materials and methods: The authors conducted a thorough analysis of scientific publications by N.I. Pirogov and papers devoted to his activity as a doctor, educator and researcher using analytical, comparative and bibliosemantic methods. CONCLUSION: Conclusions: The study suggested the new chronological boundaries in the scientific and educational heritage of N.I. Pirogov. The developed periodization accurately reflects the beginning of his scientific and pedagogical path in medical education, specifically refers to the period of his work in Germany as a supervisor of professorial candidates from 1862 to 1866, and the period of his participation in Sevastopol (Crimean) campaign and in the Franco-Prussian War, which was very important for the development of military field surgery.