ANALYSIS OF THE PROPERTIES OF POLYMER MATERIALS USED FOR THE MANUFACTURE OF TEMPORARY DENTURES

The purpose of the study is to conduct a comparative characterization of the properties of polymer materials (water absorption and solubility) used for the manufacture of temporary permanent dentures using traditional and digital methods. Materials and methods. For the study, experimental samples were made from self-hardening cold-polymerized plastic based on polymethylmethacrylate Re-Fine Bright, a chemical-cured bisacrylic composite material Protemp 4, composite blocks made of acrylate polymer for Vita CAD-Temp CAD/CAM systems and photopolymer resin for the NextDent C&B MFH 3D printer. The study was conducted in accordance with GOST 56924-2016 "Polymer reducing materials". Statistical analysis was performed using the Kraskel-Wallis and Mann-Whitney H-test. Results. It was found that for the Re-Fine Bright material, the average water absorption is 14,94 ± 0,2748 micrograms/mm3, and solubility is 0,56 ± 0,1949 micrograms/mm3, for Protemp 4, the average water absorption is 9,259 ± 0,1719 micrograms/mm3, solubility is 0,46 ± 0,1673 micrograms/mm3, for Vita CAD–Temp, the average the value of water absorption is 9,649 ± 0,2305 micrograms/mm3, solubility is 0,36 ± 0,1517 micrograms/mm3, for NextDent C&B MFH, the average value of water absorption is 21,69 ± 0,1259 micrograms/mm3, solubility is 0,4 ± 0,2121 micrograms/mm3. Conclusion. We came to the conclusion that the groups of materials studied are indistinguishable on the basis of "Solubility" and distinguishable on the basis of "Water absorption" with a significance level of p < 0,01. There were no statistical differences in the criterion of "Water absorption" between Vita CAD-Temp material, Re-Fine Bright plastic and Protemp 4 material. The water absorption rates for Protemp 4 were significantly lower compared to the ReFine Bright plastic (the median samples differ by 37,4%, p<0,0083). The samples made of photopolymer resin for the NextDent C&B MFH 3D printer had the highest water absorption value (the median of the sample was greater than the median of the groups "Protemp 4" by 61,1%, "ReFine Bright" by 37,7%, "Vita CAD-Temp" by 51,8%, p<0,0083).