COMPARATIVE ANALYSIS OF YTTRIUM CONTAINING ZIRCONIUM DIOXIDE BLOCKS ArticleMityushkina Tatiana, Fokina Sofia, Korovushkina Elizaveta, Filippov Konstantin, Meremkulov Roman, Mordanova Anastasia, Mordanov Oleg, Khabadze ZurabПроблемы стоматологии. Vol. 19. 2023. P.. 12-19