Phedotova O. Orthopedic treatment of patients with post-traumatic defects of the upper jaw with two-layer removable laminar dentures with an obturating part.

The aim of the work was to increase the effectiveness of orthopedic treatment of patients with post-traumatic and postoperative defects of the upper jaw by improving the method of manufacture and means of fixing removable prostheses with the obturating part. Clinical - laboratory, clinical - technological, calculation - graphic, analytical, method of comparative clinical - economic analysis, qualimetric and statistical (parametric and non - parametric) research methods were used to solve this goal. Scientific data on the results of experimental laboratory studies of silicone materials used for soft substrates were supplemented, their comparative evaluation was performed and data on clinical and technological features of application were obtained. A comparative assessment of the physical and mechanical properties of the developed material and its foreign analogues. It was found that the improved domestic soft substrate (MMP) material based on polyvinyl acetate is only slightly inferior to its foreign counterparts and undoubtedly has improved properties compared to the prototype based on Aerosil. As a result of the toxicological study, it was found that in general, long-term administration of MMP based on polyvinyl acetate does not have a toxic effect on the organs and systems of experimental animals and does not cause suppression of general metabolic processes. A mathematical substantiation of the physical and mechanical retention of a soft substrate in a rigid basis was performed. The obtained results indicate a sufficient margin of safety of the mechanical connection of the soft substrate and acrylic base (4.4 kgf / cm2) even in the complete absence of chemical adhesion, as the quality indicator according to ISO-10139 on this indicator is ≧ 4.0 kgf / cm2. The conducted researches have theoretical and practical value in the field of clinical dentistry and dental materials science.