The actuality of the topic of research is determined by the uncertainty of the physical and mechanical characteristics of C-silicone materials, the difference of information about their influence on the biocenosis of the oral cavity and need to improve the quality of the clinical stages of manufacture of unremovable dentures. The appearance of new imprint materials requires a more thorough analysis of their properties compared with well-known C-silicone materials.
The dissertation work is devoted to approbation and application of C-silicone impression material of our own creation "Sielast K Extra", which received the Patent of Ukraine No. 118720 from 28.08.2017, which is recommended for using in the manufacture of unremovable dentures.
For making clinical and laboratory investigations we used next C-silicones: «Consiflex type 0», (conventional name M-1), «Sielast K Extra» (conventional name M-2), «SWISSTEC» (conventional name M-3), «Speedex» (Conventional name M-4), «Zetaplus» (conventional name M-5), «Lasticomp» (conventional name M-6).
The first experimental group included 13 people who received complete anatomical impressions of the upper and lower jaws with the material "M-1". Patients of the second experimental group, which included 11 people, received impressions with silicone material "M-2". 12 persons in the third experimental group received full impressions of the jaws with a silicone material "M-3". 13 people in the fourth experimental group received impressions of both jaws with the material "M-4". The fifth experimental group included 10 people who received impressions from the jaws with the material "M-5". The sixth experimental group was characterized by the fact that 11 people received impressions with silicone material "M-6".
As the clinical significance contains of elastomeric imprint materials characteristics: compressive strength as the ability of the material to endure the tension before permanent deformation; the strength of the gap, which characterizes the resistance of the material to the gap, and adequate elasticity, we carried out a comparative study of the silicone impression materials of different manufacturers to compression and tearing. The experiments were carried out using the deformation unit MRK-1.
The study of the influence of C-silicone impression materials of these models, which is used to make unremovable dentures on microbiocenosis in the oral liquid of patients, was performed with 57 people who had received dual-layer impressions of the base mass of C-silicones according to the classical technique.
The effectiveness of prosthetics and the using of unremovable metal-ceramic dentures depends on a significant number of factors, the most important of which are: completeness of clinical examinations, the condition of the prosthetic area and the technology of making dentures. In order to establish the validity of this conclusion, comparative clinical and laboratory studies of the effect of silicone impression on the tissues of the prosthetic area were performed.
The functional state of the mucous membrane of the alveolar process and its vascular supply was determined by the method of reopardodontographic research (RPR).
Thermometric investigations were carried out by the electronic medical thermometer MT 1951 "Microlife" (Sweden).
The impression material «М–5» is detects antimicrobial activity against microorganisms of the human oral liquid.
Materials of "М-3", "М-6", "М-1", "М-2" and "М-4" are biologically neutral in comparison with normal microflora of oral liquid of patients.
The using of C-silicone impression materials can have an indirect antimicrobial effect, as it leads to a reduction of bacteria - potential pathogens for oral mucosa (Staphylococcus aureus, beta-hemolytic streptococcus and Candida species), and the use of M-6 material the disintegration of bacteria, which mainly colonize the mucous membrane of the oral cavity.
