E.M. SPERANSKAYA1,3, L.R. MUKHAMEDZHANOVA1,2, N.N. GOLUBTSOVA1, R.G. KUZNETSOVA4 1Chuvash State University named after I.N. Ulyanov, 15 Moskovskiy Pr., Cheboksary, Russian Federation, 428015 2Training and methodological center «Eksklyuziv-dent», 42 Kosmonavtov Str., Kazan, Russian Federation, 420061 3Republican Dental Clinic of the Ministry of Health of the Chuvash Republic, 15 Moskovskiy Pr., Cheboksary, Russian Federation, 428015 4Republican Clinical […]