ИССЛЕДОВАНИЕ ПРОЧНОСТНЫХ И УСТАЛОСТНЫХ ХАРАКТЕРИСТИК АРМИРОВАННОГО ЧАСТИЦАМИ ДИОКСИДА ТИТАНА ПОЛИМЕРНОГО КОМПОЗИЦИОННОГО МАТЕРИАЛА ДЛЯ БАЗИСОВ СЪЕМНЫХ ЗУБНЫХ ПРОТЕЗОВ

Abstract

Background. Removable designs are used in orthopedic dentistry for prosthetics of patients. The most used materials for the manufacture of bases of removable dental prosthesis currently are acrylate-based plastics. More than 90 % of removable dental prosthesis designs are produced with using of this material. The affordable cost of acrylate-based plastics prosthesis makes this material attractive for different groups of population. But this material has a number of well-known disadvantages: at first, the high concentration of residual monomer, which has a toxic effect, may cause allergic reaction and impossibility of using prosthesis; secondly, the porous structure of material contributes to the microbial seeding of the prosthesis; also, material shrinkage is up to 8 %. In connection with above, the certified in Russia Vertex ThermoSens (Vertex-Dental B.V., the Netherlands; ISO-Certificate 9001:2008) polyamide construction material deserves attention. This material has no residual monomer in its composition; the prostheses has an ability to be corrected in laboratory; shrinkage in the process of manufacturing designs is minimal. It is important to note such advantages as the high density of thermoplastics in combination with low specific weight and minimal porosity, which significantly reduces the formation of a microbial film on prostheses. Objectives. The aim of the research is to enhance the strength and fatigue characteristics of material based on Vertex ThermoSens, reinforced with titanium dioxide particles, for prosthetics of patients with complex clinical situations. Methods. In this work, the mechanical characteristics of reinforced with titanium dioxide powder (5 and 10 % by weight) polyamide material have been investigated. Tests on a static three-point bend at room temperature and temperature of 40 ºC and tests on fatigue of samples of this material were performed. Results. The analysis of changes of characteristics of material at different mass fractions of filler was carried out. Higher mechanical characteristics of the material with 10 % filling were noted, in particular, greater resistance to elevated temperatures and greater fatigue life. Conclusions. On the basis of research results it is possible to make a conclusion that using 1st group material is more effective for dental prosthesis production than using 2nd group material. The research results will be relevant for working out of dentures for patients with various clinical situation.