TY CONF TI COMPARATIVE EVALUATION OF THE EFFECTIVENESS OF THE APPLICATION OF DIAMOND BUR, ULTRASONIC TIP START-X AND ENDODONTIC BURS MANS TO RETRIEVE THE FIBERGLASS PIN KW fiberglass pin KW fiberglass pin extraction KW repeated endodontic treatment JO Materials of the International Congress "Dentistry of the Great Urals". December 4-6, 2019 AU Griroriev, S.S. AU Basargina, A.D. AU Eremina, A.L. AU Panfilov, P.E. AU Sorokoumova, D.V. PY 2022 PB TIRAZH Publishing House