TY JOUR TI SYSTEM ANALYSIS AND MODIFICATION OF THE ABUTMENT MULTI UNIT KW dental implants KW cement fixation KW transocclusal screw fixation KW abutment KW milled base made of zirconium dioxide JO Actual problems in dentistry AU Azimov, I.G. AU Kirtaeva, A.V. PY 2026 IS 22 PB TIRAZH Publishing House