TY JOUR TI MODERN LASER TECHNOLOGIES IN ENDODONTICS KW endodontic KW complicated forms of caries KW Er KW Cr: YSGG laser KW purulent pulpitis KW pulp necrosis KW erbium-chromium laser KW helium-neon laser KW YAG: Er laser JO Actual problems in dentistry AU Polevaya, A.V. AU Borisova, E.G. AU Polevaya, L.P. PY 2021 IS 16 PB TIRAZH Publishing House