Stability of fatigued and aged ZTA compared to 3Y-TZP and Al2O3 ceramic systems

Ernesto B Benalcázar Jalkh; Edmara T P Bergamo; Tiago M B Campos; Everardo N S de Araújo-Júnior; Adolfo C O Lopes; Sérgio M Tebcherani; Satoshi Yamaguchi; Luis A Genova; Petra C Gierthmuehlen; Lukasz Witek; Paulo G Coelho; Estevam A Bonfante

doi:10.1016/j.jmbbm.2022.105451

Stability of fatigued and aged ZTA compared to 3Y-TZP and Al₂O₃ ceramic systems

J Mech Behav Biomed Mater. 2022 Nov:135:105451. doi: 10.1016/j.jmbbm.2022.105451. Epub 2022 Sep 13.

Affiliations

¹ Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil; Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA. Electronic address: [email protected].
² Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil; Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
³ Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil.
⁴ Federal University of Technology, Paraná, Department of Production Engineering, Av. Monteiro Lobato km 04, 84016-210, Ponta Grossa, PR, Brazil.
⁵ Department of Biomaterials Science, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan.
⁶ Nuclear and Energy Research Institute, IPEN, SP, Brazil.
⁷ Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany.
⁸ Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Biomedical Engineering, NYU Tandon School of Engineering, New York University, Brooklyn, NY, USA.
⁹ Department of Surgery, University of Miami Miller School of Medicine, Miami, FL, USA.

PMID: 36162164
DOI: 10.1016/j.jmbbm.2022.105451

Abstract

To evaluate the effect of fatigue and aging on the crystalline content and reliability of a zirconia-toughened-alumina (ZTA) composite compared to its individual counterpart materials (3Y-TZP and Al₂O₃). Thirty-six disc-shaped specimens per group were obtained to comply with ISO 6872:2015. Crystalline content, microstructure and reliability of experimental groups were evaluated in four stages: 1) immediate; 2) aged; 3) fatigued; 4) aged + fatigue. Aging was performed in autoclave and Step-Stress-Accelerated-Life-Testing (SSALT) was performed using three stress profiles. Weibull statistics were used to determine Weibull parameters and life-expectancy. A significant increase in monoclinic phase in 3Y-TZP was observed after aging (19.31%), fatigue (17.88%) and aging + fatigue (55.81%), while ZTA evidenced minimal variation among all conditions (<5.69%). 3Y-TZP presented higher reliability than ZTA at 300 and 500 MPa, and ZTA outperformed Al₂O₃ at the same stress missions. None of the ceramics yielded acceptable reliability at 800 MPa. A higher characteristic strength was observed for 3Y-TZP, followed by ZTA and Al₂O₃. While after aging ZTA and Al₂O₃ remained stable, 3Y-TZP exhibited a significant increase in the characteristic stress. Aging did not affect the reliability of ZTA and Al₂O₃. 3Y-TZP demonstrated an increase in monoclinic content and characteristic strength after aging.

Keywords: Aging; Alumina; Fatigue; Microstructure; Reliability; Zirconia.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Aged
Aluminum Oxide* / chemistry
Ceramics / chemistry
Dental Materials
Humans
Materials Testing
Reproducibility of Results
Surface Properties
Yttrium* / chemistry
Zirconium / chemistry

Substances

Dental Materials
Yttrium
Zirconium
Aluminum Oxide
zirconium oxide