Surface micro-morphology, phase transformation, and mechanical reliability of ground and aged monolithic zirconia ceramic

Guilardi, Luís Felipe; Pereira, Gabriel Kalil Rocha; Gündel, André; Rippe, Marília Pivetta; Valandro, Luiz Felipe

doi:10.1016/j.jmbbm.2016.10.008

Cited by 62 publications

(54 citation statements)

References 43 publications

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“…It is already known that grinding leads to an increase in roughness (12,13), however an extensive number of studies have been showing that the phase transformation toughening mechanism may counterbalance to some extent this effect closing this defects and even resulting in increased flexural strength (3,12,13,19). Our data support the aforementioned statement, since no negative influence of increased roughness (grinding) on fatigue strength.…”

Section: Fatigue Strength Of Ground and Aged Y-tzpsupporting

confidence: 87%

“…Spectra were collected using the BraggBrentano geometry in the 2θ range from 25 to 35 degrees, at a step interval of 1 s, and step size of 0.03 degrees/step. The amount of m-phase (Xm) and the volumetric fraction (Fm) was calculated using the method developed by Garvie & Nicholson modified by Toraya and collaborators (21), extensively used and described on previous literature (4,5,13).…”

Section: Phase Analysis By X-ray Diffraction (Xrd Analysis)mentioning

confidence: 99%

“…defining the final outcome: if the balance tends to the introduction of defects it may be observed a negative impact (8,9,24), while if the balance favors phase transformation it could be observed the toughening mechanism (12,13,19). Our study corroborates that assumption, since we used the methodology preconized by this systematic review (14) to avoid defect introduction (handpieces coupled to slow speed motors and the use of plenty coolant) and we did not notice a deleterious effect, even using coarse diamond burs during grinding.…”

Section: Fatigue Strength Of Ground and Aged Y-tzpmentioning

confidence: 99%

“…Those adjustments will lead to t → m phase transformation and also to the introduction of defects (11)(12)(13). On this sense, literature shows that the outcome (toughness mechanism or LTD) will depend on the balance between these two factors: phase transformation and introduction of defects (14).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

et al. 2018

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This study aimed to investigate the effect of grinding and multi-stimuli aging on the fatigue strength, surface topography and the phase transformation of Y-TZP ceramic. Discs were manufactured according to ISO-6872:2008 for biaxial flexure testing (diameter: 15 mm; thickness: 1.2 mm) and randomly assigned considering two factors "grinding" and "aging": C-control (as-sintered); CA-control + aging; G-ground; GA-ground + aging. Grinding was carried out with coarse diamond burs under water-cooling. Aging protocols consisted of: autoclave (134°C, 2 bars pressure, 20 hours), followed by storage for 365 days (samples were kept untouched at room temperature), and by mechanical cycling (10 6 cycles by 20 Hz under a load of 50% from the biaxial flexure monotonic tests). Flexural fatigue strengths (20,000 cycles; 6 Hz) were determined under sinusoidal cyclic loading using staircase approach. Additionally, surface topography analysis by FE-SEM and phase transformation analysis by X-ray Diffractometry were performed. Dixon and Mood methodology was used to analyze the fatigue strength data. Grinding promotes alterations of topographical pattern, while aging apparently did not alter it. Grinding triggered t-m phase transformation without impacting the fatigue strength of the Y-TZP ceramic; and aging promoted an intense t-m transformation that resulted in a toughening mechanism leading to higher fatigue strength for as-sintered condition, and a tendency of increase for ground condition (C < CA; G = GA). It concludes that grinding and aging procedures did not affect deleteriously the fatigue strength of the evaluated Y-TZP ceramic, although, it promotes surface topography alterations, except to aging, and t-m phase transformation. Effect of Grinding and Multi-S t i m u l i A g i n g o n t h e F a t i g u e S t r e n g t h o f a Y-T Z P C e r a m i c

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Section: Fatigue Strength Of Ground and Aged Y-tzpsupporting

confidence: 87%

Section: Phase Analysis By X-ray Diffraction (Xrd Analysis)mentioning

confidence: 99%

Section: Fatigue Strength Of Ground and Aged Y-tzpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

et al. 2018

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“…16 In summary, two metal cylinder guides with 18 mm diameter were attached parallel to both sides of a Y-TZP block and then the lateral surfaces were ground using a polishing machine (EcoMet/AutoMet 250, Buehler, Lake Bluff, USA) with 600 grit silicon carbide sand paper until a cylinder was shaped. Afterward, the cylinders were cut under water irrigation with a diamond saw (ISOMET 1000, Buehler) in slices of 1.65 mm thickness and polished with a 1200-grit silicon carbide sand paper (on both sides).…”

Section: Specimen Preparationmentioning

confidence: 99%

Mechanical behavior of yttria-stabilized tetragonal zirconia polycrystal: Effects of different aging regimens

et al. 2017

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This study aimed to characterize and compare the effect of different aging regimens on surface characteristic (topography and roughness), structural stability (phase transformation) and mechanical performance (Weibull analysis) of a Y-TZP ceramic. Discs (15 × 1.2 mm; VITA In-Ceram YZ) were prepared according to ISO 6872-2015 for biaxial flexural strength testing and randomly assigned into five groups (n = 30): as-sintered, no aging treatment (CTRL); 20 h in autoclave at 134°C, 2 bar pressure (AUT); intermittent mechanical loading at 20 Hz/10 6 load pulses (MechLoad); AUT followed by MechLoad (AUT+MechLoad); and storage in distilled water at 37°C, for 1 year (STO). The following analyses were performed: roughness (n = 30), surface topography (n = 2), phase transformation (n = 2) and biaxial flexure strength (n = 30). Phase transformation (increase of m-phase content) was shown to be a spontaneous, unavoidable and time-dependent process, occurring even under ambient conditions (dry storage after 1 year = 6.0% increase), and is considerably accelerated in the presence of moisture (STO = 17.6%; AUT= 63.1%; and AUT+MechLoad = 59.9%). For roughness parameters, only Ra was affected by aging, and the highest values were observed for AUT+MechLoad (0.25 ± 0.07 µm). For Weibull analysis, structural reliability (Weibull moduli) and characteristic strength were not impaired after aging, and some aging conditions led to increased values (highest weibull moduli in AUT, and highest characteristic strength in STO). Phase transformation proves to be a time-dependent spontaneous mechanism that is accelerated in the presence of different stimuli. However, none of the aging regimens had a negative effect on the characteristic strength and structural reliability of Y-TZP ceramic.

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Emerging Multimodel Zirconia Nanosystems for High‐Performance Biomedical Applications

Rathee

Bartwal

Rathee

et al. 2021

Advanced NanoBiomed Research

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Advancement in nanotechnology supports system development to achieve rapid, affordable, and intelligent health management and has raised the urgent demand to explore multimodel affordable metal oxide nanostructures with the features of biocompatible tunable performance and scaled‐up processing. Keeping this as a motivation, zirconia nanostructures (Zr‐NSs) are emerging as nanostructures of choice for advanced biomedical applications due to affordable, scalable production, easy surface modifications, tunable surface morphology, multiphase stability, and acceptability by biological features such as biocompatibility, viability for bioactives, and a high isoelectric point of 9.5. Zr‐NSs, alone and in the form of hybrids, and nanocomposites have demonstrated notable high performance to develop next‐generation biosensors, implanted materials, and bioelectronics. However, their excellent salient features toward high‐performance biomedical system development are not well articulated in the form of a review. To overcome this knowledge gap, herein an attempt is made to summarize state‐of‐the‐art Zr‐NS preparation techniques as per targeted applications, surface functionalization of Zr‐NSs to achieve desired properties, and applications of Zr‐NSs in the field of biomedicine for health wellness. The challenges, possible solutions, and authors’ viewpoints considering prospects in mind are also part of this report.

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Surface micro-morphology, phase transformation, and mechanical reliability of ground and aged monolithic zirconia ceramic

Cited by 62 publications

References 43 publications

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

Mechanical behavior of yttria-stabilized tetragonal zirconia polycrystal: Effects of different aging regimens

Emerging Multimodel Zirconia Nanosystems for High‐Performance Biomedical Applications

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