Open AccessNovel process for the production of 3Y-TZP ceramics: comparison between ageing in artificial saliva and accelerated ageing
Author(s) -
M.C. Aragón-Duarte,
Miguel Bocanegra Bernal,
A. ReyesRojas,
Hilda Esperanza Esparza Ponce
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab9523
Subject(s) - monoclinic crystal system , materials science , cubic zirconia , degradation (telecommunications) , ceramic , saliva , tetragonal crystal system , accelerated aging , sintering , crystallite , composite material , dental ceramics , phase (matter) , ageing , chemical engineering , mineralogy , metallurgy , crystallography , chemistry , medicine , crystal structure , electronic engineering , organic chemistry , biochemistry , engineering
The degradation of tetragonal zirconia polycrystalline (3Y-TZP) ceramics prepared by a novel film growth technique, and by sintering at 1400 °C, was evaluated for one year using two processes: (i) degradation under oral conditions in artificial saliva (37 °C and pH 6.8) and (ii) accelerated degradation by autoclaving at 134 °C at 0.2 MPa of pressure. X-ray diffraction analysis of 3Y-TZP ceramics sintered at 1400 °C showed a phase transformation (tetragonal to monoclinic) in 3Y-TZP ceramics after the fifth month in artificial saliva. After 12 months in artificial saliva, there was ∼11% of monoclinic phase present in 3Y-TZP ceramics, but only ∼2% of monoclinic phase in samples that were subjected to accelerated degradation for 5 h. No correlation was found between the level of ageing during accelerated degradation and degradation in artificial saliva. There was no degradation of 3Y-TZP ceramics prepared by a novel film growth technique, independently of the degradation method used, which suggests that this material could be used for dental prosthetics.