Influence of the microstructure on the life prediction of hydrothermal degraded 3Y-TZP bioceramics

Abreu, Lais G.; Quintino, Manara Nogueira; Alves, Manuel Fellipe Rodrigues Pais; Habibe, Caroline H.; Ramos, Alfeu Saraiva; Santos, Claudinei dos

doi:10.1016/j.jmrt.2020.07.059

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…Tables 3 and 4 summarize the numerical predictions of the risk of failure determined as a function of loading conditions for the titanium and 3Y-TZP, respectively. Yttrium-stabilized zirconia (Y-TZP) ceramics present a flexural strength loss due to aging, a consequence of hydrothermal degradation in aqueous environments [28][29][30] , or when submitted to cyclic loading as fatigue. Thus, these parameters must be considered in the design of the geometry of ceramic implants, aiming to improve the reliability of this material.…”

Section: Resultsmentioning

confidence: 99%

A Strength Behavior Approach for 3Y-TZP Ceramics Dental Implants Based on Finite Element Simulations

Ward

et al. 2023

Mat. Res.

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This study is based on the numerical simulation of the mechanical response of yttrium-stabilized zirconia ceramic (3Y-TZP) dental implants as a function of their intrinsic geometry and masticatory loads. Samples (n=20) of 3Y-TZP ceramics were compacted, sintered at 1500 °C -2h, and characterized by relative density, X-Ray diffraction (XRD), and scanning electron microscopy (SEM). The elastic parameters (modulus of elasticity and Poisson ratio), used in the numerical simulations, were measured by the Impulse Excitation Technique, and the bending strength was obtained using piston-on-three-balls testing. An authorial implant design and, comparatively, commercial implant CAD models were used in this study as an initial geometry of dental implant in a typical adult mandible anatomy. From CAD and CAE techniques, finite element models were generated for all implant geometries. Loading cases were considered based on different intensities (100N to 500N) and orientation angles (45° or 90°) to reproduce the human masticatory efforts. The numerical predictions were compared with finite element simulations of gold-standard titanium-based implants. The investigated 3Y-TZP sintered ceramics presented high densification (> 99%), with a microstructure formed by submicron equiaxed tetragonal zirconia grains. The 3Y-TZP average bending strength obtained from piston-on-three-balls testing is 1192 ± 99 MPa. For both dental implant geometries, the zirconia implants showed average strength of less than 550 MPa, which, in turn, is independent of the masticatory load value or orientation angle. All finite element predictions are 50% inferior to the corresponding measured flexural strength values and preliminarily enable the 3Y-TZP ceramics for dental implant applications without fracture risk.

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Section: Resultsmentioning

confidence: 99%

A Strength Behavior Approach for 3Y-TZP Ceramics Dental Implants Based on Finite Element Simulations

Ward

et al. 2023

Mat. Res.

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“…The condition commonly by using conventional water-vapor autoclave operating at low temperature (98, 121 and 132°C) respectively and under adiabatic pressure for different exposure time [40]. In Figure 17 showed the example of the evaluation of the phase transformation (t -> m) when exposed the simulated degradation environment [41]. The method has been proven as an effective way to assess any modified and improved 3Y-TZP of the characteristic toward the resistance of LTD. Several studies showed doped 3Y-TZP exhibited good LTD resistance by delaying the phase transformation then further minimized the degradation of mechanical properties.…”

Section: Limitation and Solutionmentioning

confidence: 99%

“…Figure 17.Monoclinic vs degradation time of 3Y-TZP under degradation exposure time (134°C, 4 bar)[41].…”

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confidence: 99%

Perspective Chapter: The Application of Yttria-Stabilized Zirconia (YSZ)

Cheong¹,

Sivanesan²

2023

Zirconia - New Advances, Structure, Fabrication and Applications

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Pure zirconia will transform into different phases, which include monoclinic, tetragonal, and cubic, at different high temperature levels. Specific phases can be retained at room temperature by adding stabilizer and yttria is one of the most common stabilizers for zirconia, commonly formed yttria stabilizer zirconia (YSZ). To utilize YSZ in various industry applications, the amount of yttria and sintering temperature played a vital role. Thus far, YSZ has received a warm welcome in the industries of thermal barrier coating (TBC), solid oxide fuel cell (SOFC), and biomaterial. However, the limitations and challenges still occur, and this opens up the room and possibility of enhancing and improving the material properties of YSZ for a better performance in the mentioned area. This chapter explained the working principles of YSZ in the industries respectively and the research been conducted to improve the materials accordingly.

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“…However, if the zirconia is stabilized with yttria (Y-TZP) the meta-stabilization of the zirconia tetragonal phase can be impaired, both superficially and inside the specimen, due to the low temperature hydrothermal degradation (LTD) that occurs by changing the energy balance of the degraded grain. The t→m transformation may occur in this grain spontaneously or with small mechanical stimuli, giving rise to microcracks and loss of strength [17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Addition of Previously-Synthesized Ce-TZP/Al2O3 Submicrometric Powder on the Properties of Al2O3-Based Ceramics

et al. 2022

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This work investigated the effect of a composite of tetragonal zirconia with alumina-reinforced Ceria (ATZ) previously synthesized, on the properties of alumina-based ceramics (Al 2 O 3 ). Monolithic alumina powder and Al 2 O 3 powder mixtures containing 5, 10, 15 and 20 wt.% of Ce-TZP/Al 2 O 3 were processed by high energy milling, compacted and then sintered at 1600 °C -2 h. Sintered pure alumina and composites were characterized by relative density, scanning electron microscopy, X-ray diffraction and surface roughness. Then, the elastic modulus, the Vickers hardness, the fracture toughness and the 4-point flexural strength were evaluated. The results indicated an increase in relative density as a function of the addition of ATZ, with values between 94.3 ± 0.8% and 98.9 ± 0.7%. The observed microstructure after sintering showed tetragonal ZrO 2 grains with average sizes of 0.6 μm well dispersed in the Al 2 O 3 matrix, which presents average grain sizes of around 1.5 μm. The crystalline phases identified in the composites were ZrO 2 -tetragonal and Al 2 O 3 hexagonal. The addition of the composite (ATZ) in the alumina matrix generates a gradual reduction in the elastic modulus (398 ± 15 GPa ~366 ± 34 GPa) and in the hardness (20.5 ± 1 GPa ~17.3 ± 0.7 GPa) of the sintered ceramics. On the other hand, the addition of this same composite (ATZ) in the alumina matrix considerably increases the materials fracture toughness, reaching values of approximately 6.7 ± 0.9 MPa.m 1/2 . The same trend was observed in the flexural strength results which ranged from 258 MPa (5wt.% Ce-TZP/Al 2 O 3 ) to 316 MPa (20wt.% Ce,Y-TZP/Al 2 O 3 ). The Ce-TZP reinforcement acts as a toughening agent of the Al 2 O 3 matrix due to the coupled mechanisms of toughening by zirconia phase transformation, residual stresses due to the difference in thermal expansion of the crystalline phases and differences in microstructural morphologies.

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Influence of the microstructure on the life prediction of hydrothermal degraded 3Y-TZP bioceramics

Cited by 7 publications

References 37 publications

A Strength Behavior Approach for 3Y-TZP Ceramics Dental Implants Based on Finite Element Simulations

A Strength Behavior Approach for 3Y-TZP Ceramics Dental Implants Based on Finite Element Simulations

Perspective Chapter: The Application of Yttria-Stabilized Zirconia (YSZ)

Effect of Addition of Previously-Synthesized Ce-TZP/Al2O3 Submicrometric Powder on the Properties of Al2O3-Based Ceramics

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