Roman O. Features of carrying out teeth restoration by applying the light-cured restorative materials

The dissertation work is devoted to increasing the efficacy of restoration of carious teeth of the lateral group by optimizing the use of sandwich technique applying light-activated composite resins reinforced with fiberglass, and improving the light mode for its hardening. A retrospective analysis of reports of dental institutions and dental departments of multidisciplinary medical institutions of districts and cities of regional subordination of Kirovohrad region showed that for the restoration of carious teeth they most often used chemical curing composites, followed by reducing the frequency of use cements and light-activated composite resins. From 2013 to 2019, it increased from 16,6% to 26,4%. A retrospective assessment of the clinical condition of 918 direct tooth restorations from different materials revealed that 87,5% of restorations from cement materials, 75,6% from restorations from chemical curing composites, 51,0% from light-activated composite resins have various disorders. As a result of laboratory research, scientific data on the depth of polymerization of light-activated composite material reinforced with fiberglass, which reaches a reliable (p˂0,05) maximum value using a light flux from a light emitting diode photopolymerizer with a constant intensity. When using the light flux of the halogen photopolymerizer in the "soft start" mode, the depth of polymerization was the smallest (p˂0,05). Extended scientific information on the microhardness of light-activated composite material reinforced with fiberglass, which in terms of 1 hour to 7 days on all studied surfaces of the samples was significantly (p˂0,05) highest in the case of curing of the material under the influence of light flux from a light emitting diode photopolymerizer with a constant intensity. The marginal adhesion of the light-activated composite material reinforced with fiberglass to the dentin of teeth by micropermeability was studied differed insignificantly (p>0,05). Based on the results of laboratory studies, optimized approaches to direct restoration of lateral teeth in a closed sandwich technique using light-activated composite material reinforced with fiberglass have been developed. In the case of its application in one layer, the application for curing exposure to light flux in the "soft start" mode and constant high intensity. High clinical efficiency of direct restoration of carious lateral teeth in a closed sandwich technique using light-activated composite material reinforced with fiberglass according to optimized approaches was proved, which according to clinically significant criteria in the study period 12 and 24 months in the case of "directed" polymerization was 92,2% and 91,3%, for the use of two-layer application of material with these light effects was 93,6% and 93,2%, in respectively.