German S. Clinical and laboratory substantiation of application of A-silicone material for claspless fixation of dentures with mesio-distal inclination of the teeth.

The results of the study were suggested treatment of patients with defects of dentition with the mesio-distal inclination of the teeth by removable acrylic partial dentures with claspless fixation by domestic A-silicone material The results of the research were physical and mechanical properties of A-silicone materials and their comparative evaluation. The obtained data indicate that physical and mechanical properties of the developed formulation of A-silicone material fully meet the requirements of ISO 10139-2. Comparative characteristics showed that the native material on key indicators is not inferior to foreign material (p<0.01), differs from the prototype more solid and hard consistency of 10 %, which gives the possibility to fix the denture without clasps. According to the results of a study was conducted the mathematical justification of claspless denture and developed simplified table, which calculates the rational design of denture. Determined the optimal values of the ratios of undercut and height of the inclined teeth. There are difficulties with the introduction of the prosthesis when the mesio-distal tilt angle more than 45° and when tilted teeth less than 15° appeared problems with fixing. Allowed the thickness of the silicone compound is from 0.1 to 2.4 mm. When the thickness of the layer of material above 3.0 mm are possible complications in the form of breaks in service. Conducted a study of optical density of bone tissue of alveolar bone by cone-beam computed tomography depending on the timing of the removal of teeth and use of removable dentures. Determined the optical density of bone tissue of alveolar processes of jaws in the region of defects of the dentition was from -420,445 to 1629,754. Defined the fact of change of optical density of bone tissue of the alveolar process in the early period of using removable dentures, as well as increasing bone density of the alveolar bone in sustainable depending on the period of time after tooth removal. We was developed method of orthopedic treatment of patients with defects of dentition in the mesio-distal inclination with partial removable laminar dentures with claspless fixation by using layer of A-silicon material for fixation and stabilization. Well-grounded and clinically tested results of the developed A-silicone material for claspless fixation. The results of the study of the number of RPD corrections identified that the neediness for adjustments of the denture with clasp fixing occurred often in comparison with patients who used claspless RPD with a layer of A-silicone material. Rate of adjustments of basis of the denture without elastic material on the average in two times (p<0.05) more than patients who used the claspless denture with a layer of A silicone material. The study has theoretical and practical importance in the field of clinical dentistry and tooth-technical materials science. In the results of laboratory tests determined optimal parameters for new materials and studies of their clinical and technological properties allow to improve the quality of treatment and, in general, to provide a reasonable and optimal selection of these materials for the manufacture of orthopedic structures.