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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cyclic fatigue behaviour of hydrothermally aged 3Y-TZP ceramics in 4-point bending tests

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Author(s):
Souza, Renato C. [1] ; Duarte, Roberto N. [1] ; Alves, Manuel F. R. P. [2] ; Daguano, Juliana K. M. B. [3] ; dos Santos, Claudinei [4] ; Strecker, Kurt [5]
Total Authors: 6
Affiliation:
[1] Inst Fed Sao Paulo, IFSP SJBV, Campus Sao Joao Boa Vista, Sjb Vista, SP - Brazil
[2] Univ Sao Paulo, Escola Engn Lorena, USP EEL, Lorena, SP - Brazil
[3] Univ Fed ABC, UFABC, Lab Biomat & Disp Biomed, Sao Bernardo Do Campo, SP - Brazil
[4] Univ Estado Rio de Janeiro, Fac Tecnol Resende, UERJ FAT, Resende, RJ - Brazil
[5] Univ Fed Sao Joao Del Rei, Dept Engn Mecan, UFSJ, Sao Joao Del Rei, MG - Brazil
Total Affiliations: 5
Document type: Journal article
Source: PROCESSING AND APPLICATION OF CERAMICS; v. 15, n. 2, p. 184-194, 2021.
Web of Science Citations: 0
Abstract

Fatigue is one of the most important properties to be considered in ceramic dental implants due to cyclic mechanical stresses arising from the chewing process. In this work, the fatigue behaviour of hydrothermally degraded ZrO2-based ceramics stabilized with 3 mol% Y2O3 (3Y-TZP) was studied in 4-point bending tests. Samples of 3Y-TZP were compacted (100 MPa), sintered at 1475 degrees C for 2 h, polished and hydrothermally degraded in an autoclave as described in the ISO-13356 standard. The samples were characterized by their relative density, crystalline phase composition, microstructure and surface roughness. The highly dense (>99.6% TD) sintered 3Y-TZP ceramics has only tetragonal t-ZrO2 phase, even after hydrothermal ageing. Furthermore, the ceramic materials presented a Vickers hardness of 12.7 +/- 0.2 GPa, a fracture toughness of 7.1 +/- 0.3 MPa.m(1/2) and a 4-point bending strength of 940.1 +/- 67 MPa. Based on the bending test results 5 different stress levels for the fatigue tests were selected and conducted by cyclic 4-point bending obtaining the S-N curve. Weibull statistics was used for the statistical analysis. The fatigue tests indicate that the limit of fatigue resistance of this 3Y-TZP ceramics is around 550 MPa, i.e. higher than the limits established in the ISO-13356 standard for the use of Y-TZP ceramics for the manufacture of implants. The fatigue behaviour of the investigated 3Y-TZP ceramics was related to the toughening mechanisms acting in Y-TZP ceramics, such as transformation toughening related to t -> m phase transformation and microcracking. (AU)