Novel process for the production of 3Y-TZP ceramics: comparison between ageing in artificial saliva and accelerated ageing

• Published in: Materials research express 2020-06, Vol.7 (6), p.65402
• Main Authors: Aragón-Duarte, M C, Bocanegra Bernal, M, Reyes-Rojas, A, Esparza-Ponce, H E
• Format: Article
• Language: English
• Subjects: 3Y-TZP; Aging; Aging (artificial); artificial saliva; Autoclaving; Ceramics; Degradation; Dental materials; Film growth; low-temperature degradation; Phase transitions; Prostheses; Saliva; Tetragonal zirconia; Tetragonal zirconia polycrystals; XRD; Yttria-stabilized zirconia; Zirconium dioxide
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ab9523

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.