Yttria-stabilized Zirconia Research Articles

A novel ceramic modified carbon based sensor for ultrasensitive electro-sensing of fast green FCF analysis: An advancement in toxic dye detection

Fast Green FCF (FG) is categorised as a triarylmethane dye, which has been associated with a rise of sarcoma, respiratory complications, inhibition of neurotransmitter release, and skin irritation. The incorporation of Yttria-Stabilized-Zirconia (YSZ) and Molybdenum Disulfide (MoS2) nanoparticles in the modification of a carbon paste electrode (YSZ/MoS2@CPE) facilitated the investigation of FG. The sample was characterised using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX) and X-ray diffraction (XRD). Material performance was evaluated using electrochemical impedance spectroscopy (EIS). The FG compound was subjected to experimentation under various phosphate buffer conditions, employing the techniques of Cyclic voltammetry (CV) and square wave voltammetry (SWV). The ideal pH for achieving the most favourable outcomes was determined to be 6.0, within 0.2 V–1.1 V potential. The utilisation of the diffusion electrode technique was employed to investigate the impact of various parameters on the electrochemical properties. The quantitative assessment of FG was conducted using SWV within the concentration between 0.1 and 10 µM, demonstrating a linear relationship. The values for the limit of detection (LOD) and limit of quantification (LOQ) were established at 0.7 × 10−9 M and 2.3 × 10−9 M, which were found to be lowest compared to the earlier reports. The application of this novel methodology yielded successful results in quantifying FG levels in both biological and water samples with a recovery of 97.29 %–98.48 %.

Additive manufacturing of sensor prototype based on 3D-extrusion-printed zirconia ceramics

Additive manufacturing of ceramics has attracted large interest due to its unique ability to rapidly prototype, low cost, and increased geometric complexity. Material extrusion technique is often considered for processing and shaping fine and dense ceramic structures because of the high solid loading in ink. In this work, 8 mol.% yttria-stabilized zirconia ink with 70 wt% ceramic loadings was prepared to print zirconia samples in horizontal and vertical directions, following two different filament orientations: 0/90° and ±45°. The study's main objective was to evaluate printing design influences on mechanical properties. This was assessed through flexural testing and digital image correlation analysis. Experimental findings showed that samples printed horizontally with ±45° filament orientation displayed the highest strength. A detailed inspection of fracture surfaces revealed that printing defects were the critical failure location sites formed after sintering and intimately related to printing design issues. After that, a conductive sensor was integrated into the surfaces of 3D-printed specimens by screen-printing silver-based conductive ink to analyze the structural health of zirconia samples. The sensing capabilities of printed conductive patterns were investigated using the four-point bending tests. The results demonstrated that the electrical resistance of the printed silver patterns increased as the applied load on zirconia substrates rose. It indicates that hybrid material extrusion and screen printing techniques are favored ways to manufacture sensors for structural detection of advanced 3D-printed ceramics.

Influence of chemistry and surface roughness of various thermal barrier coatings on the wettability of molten sand

High temperature wettability experiments were carried out to investigate how chemistry and surface roughness affect wetting characteristics of molten sand several promising thermal/environmental barrier coatings. Contact angle experiments were performed on varying as-sprayed and polished yttria-stabilized zirconia (YSZ), rare-earth oxide-YSZ (REO-YSZ), and rare-earth silicate coatings subjected to molten synthetic sand at 1260 °C. The results showed that the spreading rate of molten sand was higher on silicate-based environmental barrier coatings (~60°/min) than on Zr-based thermal barrier coatings (~25°/min). Increased surface roughness had opposite effects on the wettability depending on the reactivity of the coatings. Wettability decreased on coatings such as YSZ (which did not react with sand) but increased for REO-YSZ coatings (which formed reaction products with sand). It was found that while the REO-YSZ coatings were able to promote formation of the apatite that performed as a sealing layer to reduce further infiltration, molten sand wetting increased. YSZ was found to have greater wetting resistance in the roughened state while the REO-YSZ coatings had greater wetting resistance in the polished state. Surface energy, microstructure, and molten sand penetration also play a key role in the wetting kinetics and are discussed. This work reveals the dependency of chemistry and surface roughness on influencing the “sandphobicity” (analogous to hydrophobicity) of a material and provides insights for optimizing these variables to realize more “sandphobic” coatings.

Optical properties of yttria-stabilized zirconia from spectroscopic ellipsometry

Complex dielectric function (ɛ = ɛ1 + iɛ2) spectra of a heat treated single crystal yttria-stabilized zirconia (YSZ) have been determined over a spectral range of 0.03–8.5 eV using spectroscopic ellipsometry. Spectra are collected using three instruments covering different parts of the measured spectrum. The YSZ sample is modeled as a semi-infinite bulk crystal covered by a surface layer described by a Bruggeman effective medium approximation of equal parts YSZ and void.

Analysis of semi-molten hollow particle spreading and deformation in plasma spraying

Hollow yttrium-stabilized zirconia (YSZ) particles, which are often used to prepare high porosity coatings in industry, hit substrate at a fully molten state or semi-molten state due to the high temperature gradient of particles caused by the low thermal conductivity. Considering the hollow solid core large deformation and liquid solidification during the deposition of semi-molten hollow particles (SMHPs), a fluid-structure interaction model described by the coupled Eulerian and Lagrangian (CEL) method, is developed and validated to investigate the spreading results in thermal spraying. The empirical formula of dynamic viscosity based on the ABAQUS CEL method is proposed and verified for simulation of the liquid YSZ spreading and solidification. The compression ratio and plastic dissipation are calculated to reveal flattening and buckling phenomena of hollow solid core with different initial velocities and hollow radius. Moreover, a double-SMHP impact model is established to simulate the interaction of particle-particle-substrate, and the effect of flattening, buckling and structural self-contact on porosity is analyzed. Numerical simulation results show that hollow solid core large deformation induces instability accompanied by flattening, buckling or structural self-contact, which results in the reduction of layer porosity.

Stimulation of Bone ingrowth using YSZ/ β-TCP/PCL composite bilayer coating on 316 LSS scaffold for orthopedic application

The demand towards ideal tissue construct using polymer and ceramics made the researchers to do the search of polymer composites with desirable properties. Material selection for the composite play a major role to get long life. The selection of materials can be based on the nature, location and tissue type, which should be regenerated. Normally, a bone construct has its own requirements like osteo conduction properties, Tendency to mineralize, Rate of degradation and osteogenic differentiation properties. The best approach is to create regenerative medicine using suitable devices. This work focuses on developing the scaffold using 316L stainless steel fabricated with dual coating. The first layer of coating was made using Yttria Stabilized Zirconia by electrophoretic deposition. While the top second layer made as electro spun over 316L stainless steel . The electro spun made with β-Tricalcium phosphate (β-TCP) incorporated in PCL (Polycaprolactone). The process of electrospinning preferred to achieve porous surface. The bilayer scaffold performance was evaluated by surface morphology, bioactivity, bioresorbable and biodegradability with its cell adhesion capacity were studied. The results of X-ray diffraction reveal the presence of nanoparticle on the top layer of 316L stainless steel scaffold. The surface topography studies using Field Emission Scanning Electron Microscopy (FESEM) confirms more than 70 % porosity. The functional group present in YSZ/β-TCP/PCL composite bilayer on 316L SS were determined using FTIR. The developed bilayer coated 316L Stainless steel scaffolds further evaluated by invitro studies to confirm the cell adhesion capability. MG 63 cell line isolated from the bone and possess fibroblast morphology was used for the assay. The cells were cultured and exposed to the developed scaffold, the cultured cells were exposed to MTT (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) and the reduction of MTT directly measures the cell viability and the color change read through spectrophotometer. The cell growth and proliferation confirm its cell adhesion property. This present study helps in drug delivery using the nano fibers incorporated with bioresorbable TCP. The presence of TCP on the top of electro spun layer substantially supports the osteo conductivity through mineralization and degradation property.

Experimental Investigation of Naphthalene Induced Degradation of Reversible Solid Oxide Cells Operated on Bio-Syngas

The influence of the operational conditions and the electrode material on the degradation induced by the model tar naphthalene on 10 × 10 cm2 fuel-electrode supported solid oxide cells operated on artificial bio-syngas under internal reforming conditions is experimentally investigated. Two different fuel electrodes are investigated based on yttrium-stabilized zirconia (YSZ) and gadolinium-doped ceria (GDC). A parameter study of the operational temperature and the operation mode (fuel cell or electrolysis mode) is conducted with the YSZ-based fuel electrode to quantify the effects on the cell degradation. The fuel off-gas composition and electrochemical impedance spectra are used to characterize the cell prior to the experiment and monitor its performance during the poisoning process. The influence of the tar on the Ni-YSZ electrode cell is investigated for an operation at 700 °C and 800 °C in fuel cell mode, and an operation at 700 °C in electrolysis mode. The experiment at 700 °C is repeated with the Ni-GDC electrode cell. At the increased operational temperature, the Ni-YSZ cell is more robust but carbon depositions occur. The voltage degradation during electrolysis operation increases significantly compared to fuel cell operation. The Ni-GDC electrode does not show an increased robustness compared to the Ni-YSZ electrode.

The solid particle erosion performance of tungsten inert gas yttria-stabilized zirconia - Inconel 625 composite cladding

The yttria-stabilized zirconia (YSZ) - Inconel 625 (IN625) composite cladding was deposited on a stainless steel substrate using a tungsten inert gas welding manipulator to protect it from solid particle erosion. Erosion wear tests were carried out at room temperature according to the ASTM G76-18 procedure. The surface of the tested material was exposed to a jet of alumina erodent particles at impact angles of 30 and 90°, respectively. Scanning electron microscopy images were utilized to examine the morphologies of the eroded surface and the microstructure of cladding. The erosive performance of YSZ - IN625 composite cladding was 3.5 and 2.4 times compared to the substrate at different impact angles. Improved microhardness and fracture toughness resulting from the favourable interaction between the hard ceramic YSZ particles and the IN625 matrix led to the enhanced erosion performance of composite cladding. Micro-cutting and ploughing were the predominant wear mechanisms in the substrate during the solid particle erosion test at a 30° impact angle, whereas the indentation-induced plastic deformation was domi­nant at a 90° impact angle. The results also revealed that the micro-cutting, detached splats and fissures were responsible for the wear in composite cladding at 30 and 90° impact angles.

Synthesized by coprecipitation method for controlled phase structures of 5YSZ

Yttria-stabilized zirconia (YSZ), which exhibits a tetragonal phase, finds widespread application in the realm of high-temperature solid electrolytes. In the context of this research endeavor, a concerted effort was undertaken to procure a stable and controlled tetragonal phase structure within 5 mol% yttria-stabilized zirconia (5 YSZ) by modulating the precipitation rate of YSZ sols in three distinct precipitation environments, namely acidic (AC), near to neutral (NE), and alkaline (AL) conditions. Through the characterization of 5 YSZ compounds synthesized in these various environments, encompassing an assessment of their elemental composition, phase structure, local structure, and microscale morphology, it was discerned that under acidic conditions, the product exhibited non-uniform elemental distribution, pronounced agglomeration, and an abundance of hydroxyl groups, all of which proved detrimental to the stability of the tetragonal phase, resulting in the presence of 40.63% monoclinic phase. Conversely, under alkaline conditions, substantial agglomeration and hydroxyl group presence were also noted, with 34.7% monoclinic phase in the product. In stark contrast, under the condition which is near to neutral, the product demonstrated uniform elemental distribution, excellent dispersion characteristics, and a virtual absence of hydroxyl groups. The tetragonal phase structure remained stable and homogeneous, with almost negligible monoclinic phase content. Subsequent ceramic processing resulted in the highest attainable density (99.7%), coupled with the highest ionic conductivity at 850 °C (35.2 mS/cm). This study underscores that pH control during coprecipitation reactions stands as a robust and effective methodology for achieving a stable tetragonal phase structure.

Study of powder entrainment in L-PBF process with maximum hatching space for higher process efficiency

Laser powder bed fusion (LPBF) is a well-known metal additive manufacturing method with high processing flexibility, but the processing time and energy cost are important issues. As the objectives of this study, the optimal hatching is established not only for the quality but also for the process efficiency. The powder entrainment (from CFD-DEM simulation) and the melt pool geometry (from heat transfer finite element simulation) are used to extract the optimal hatching space. In maximizing the hatching space to enhance the process in throughput, the high quality of the 3D part is still maintained. The experimental results showed an 80% increase in efficiency with the optimal 90μm hatching space compared to previous studies using AA6061 with 2 vol% YSZ (Yttria-stabilized zirconia) with the common 50μm hatching space (due to the laser beam size overlap in 50%) and the relative density of 99% is still achieved, thus demonstrating that the process efficiency was improved while maintaining high quality. Uniquely, it is found that the laser power and scanning speed mainly affect the relative density of a 3D object instead of the hatching space. Thus, the maximum process efficiency in throughput can be significantly achieved by designing the maximum hatching space. To the authors' knowledge, there are few studies on process optimization based on the powder phenomenon, thus an innovative study is proposed to extract the maximum hatching space based on powder motion and melt pool geometry.

Application of Yttria Stabilized Zirconia (8YSZ) and NiO Precursors for Fabrication of Composite Material for Anode-Supported SOFCs

Application of Yttria Stabilized Zirconia (8YSZ) and NiO Precursors for Fabrication of Composite Material for Anode-Supported SOFCs

SnS2 nanosheets/Ag2S quantum dots heterojunction supported by YSZ nanofibers enable real-time room-temperature NO2 gas sensor

Air pollution has emerged as a critical global issue, necessitating the development of effective real-time gas monitoring technologies. However, conventional gas sensors face limitations such as high energy consumption and sluggish response/recovery kinetics. In this study, we report a novel SnS2/Ag2S heterojunction supported by yttria-stabilized zirconia nanofibers (YSZ@SnS2/Ag2S) through a facile electrospinning, hydrothermal and subsequent cation-exchange method. This hierarchical composite nanofiber consists of well-distributed Ag2S quantum dots (QDs) attached to vertical anchored SnS2 nanosheets, forming an interconnected network supported by YSZ nanofibers. The integrated sensor exhibited high response of 3.27 and swift response/recovery times of 12/27 s to 1 ppm NO2 at room temperature, respectively. Benefited from highly permeable three-dimensional continuous conductive nanofibers, along with the hierarchical nanosheets/QDs structure, the gas transmission/diffusion and number of reactive sites were ensured. Additionally, the interfacial built-in electric field of SnS2/Ag2S heterojunction further enhanced the electron transfer, carrier migration and gas-sensitive reaction kinetics. This study provides insights into the development of functional composite nanofibers and paves the way for the exploitation of real-time room-temperature gas sensing applications.

Using Planar Metamaterials to Design a Bidirectional Switching Functionality Absorber—An Ultra-Wideband Optical Absorber and Multi-Wavelength Resonant Absorber

This study aimed to investigate a bidirectional switching functionality absorber, which exhibited an ultra-wideband characteristic in one direction, while in the other direction it demonstrated the absorption of three different resonant wavelengths (frequencies). The fully layered planar structure of the absorber consisted of Al2O3, Zr, yttria-stabilized zirconia (YSZ), Zr, YSZ, Al, YSZ, and Al. The simulations were conducted using the COMSOL Multiphysics® simulation software (version 6.1) for analyses, and this study introduced three pivotal innovations. Firstly, there had been scarce exploration of YSZ and Zr as the materials for designing absorbers. The uses of YSZ and Zr in this context were a relatively uncharted territory, and our research endeavored to showcase their distinctive performance as absorber materials. Secondly, the development of a planar absorber with multifunctional characteristics was a rarity in the existing literature. This encompassed the integrations of an ultra-wideband optical absorber and the creation of a multi-wavelength resonant absorber featuring three resonant wavelengths. The design of such a multi-wavelength resonant absorber holds promise for diverse applications in optical detection and communication systems, presenting novel possibilities in related fields. Lastly, a notable discovery was demonstrated: a discernible redshift phenomenon in the wavelengths of the three resonant peaks when the thickness of YSZ, serving as the material of resonant absorber layer, was increased.

Preparation and thermophysical properties of medium-entropy fluorite-structured oxide of (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ

A medium-entropy fluorite-structured ceramic of (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ was prepared using a solid state reaction method combined with conventional sintering at 1600 °C for 10 h. This ceramic has uniform elemental distribution without impurity and segregation. The annealing experiment results show a reversible transformation between single phase and double phases in (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ in 800–1600 °C. The reversible phase transformation does not display any obvious influence on the thermal expansion of this sample. The thermal expansion coefficient of (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ is 12.4 × 10−6 K−1 in 100–1500 °C, higher than that of 8 wt% yttria-stabilized zirconia (8 YSZ). Furthermore, (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ possesses a lower thermal conductivity (1.51 W m−1 K−1 at 900 °C) and higher oxygen barrier property compared with 8 YSZ at high temperature. The Vickers' hardness, Young's modulus and fracture toughness of (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ are 10.0 GPa, 193.9 GPa and 1.93 MPa m1/2, respectively. These results demonstrate that (Y0·25Zr0.25Hf0.25Ce0.25)O2−δ can be used as a promising candidate ceramic of thermal barrier coatings.

Interfacial Stability between High-Entropy (La0.2Yb0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 and Yttria-Stabilized Zirconia for Advanced Thermal Barrier Coating Applications

(La0.2Yb0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 (HEZ) has shown considerable promise as a novel thermal barrier coating material for temperatures exceeding 1300 °C. This study systematically investigates the interfacial stability of (La0.2Yb0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 with yttria-stabilized zirconia (YSZ), which is of paramount importance for its application in double-layer thermal barrier coatings. Our findings highlight that rare earth elements with a smaller radius diffuse more easily into the YSZ lattice, resulting in a broader diffusion zone. Simultaneously, the incorporation of rare earth elements into the YSZ lattice inhibits tetragonal-to-monoclinic phase transformation. Compared to La2Zr2O7/YSZ, HEZ/YSZ demonstrates superior high-temperature stability, which could be attributed to the higher fracture toughness and lower thermal expansion coefficient of HEZ, the absence of t-m transformation and the formation of a continuous gradient diffusion layer that minimizes interface stress. This study offers a practical strategy for designing materials for durable double-layer thermal barrier coating systems.

Shear bond strength, finite element analysis, flexural strength and accuracy analysis of additively manufactured bio-inspired 3Y-TZP for dental applications

Weak shear bond strength (SBS) has always been a challenge for clinical bonding of 3mol% yttria-stabilized tetragonal zirconia (3Y-TZP). With the development of additive manufacturing technology, vat photopolymerization (VPP) is an alternative that allows zirconia to form precise complex structures and achieve bionic structure molding based on the natural advantages of different organisms in relation to biological structure, microstructure, and mechanical behavior. As report goes, the toe structure of tree frog can effectively achieve friction enhancement on humid and flooded surfaces. In this paper, we present a new type of 3Y-TZP material loaded with tree-frog bionic structures via VPP additive manufacturing to improve SBS between resin cement and 3Y-TZP for clinical requirements. And flexural strength, finite element analysis and accuracy analysis of bio-inspired 3Y-TZP is carried out to verify its feasibility of clinical application. The SBS of the bio-inspired group with 250 μm width and 250 μm height reached a maximum of 22.7 ± 1.3 MPa before hydrothermal aging, the flexural strength of the bio-inspired group with 250 μm width and 150 μm height decreased the least, reaching 825 ± 30 MPa, and the accuracy analysis of the central-incisor veneer restoration loaded with the bionic structures showed that the average deviation value was 0.033 ± 0.036 mm. This study has found that these bionic structures can effectively improve the SBS of the interface between zirconia and resin cement, while flexural strength and accuracy can also meet requirements of clinical dental application.

External Voltage-Induced Restructuring of the Solid-State Electrode/Electrolyte Interface Revealed by X-ray Photoelectron Spectroscopy Depth Profiling Analysis.

Solid/solid interfaces between electrodes and electrolytes play an important role in all-solid-state energy devices, while microscopic investigations of the buried interfaces remain challenging. Here, we construct metal|yttria-stabilized zirconia (YSZ)|Au model cells consisting of a metal film cathode (metal (M) = Au, Ni, and Ag), a single crystalline YSZ electrolyte, and a Au film anode, and use quasi in situ X-ray photoelectron spectroscopy depth profiling analysis to investigate the restructuring of buried interfaces between metal cathodes and YSZ. After applying 2.9 V at 500 °C, interfacial Zr4+ ions in the electrolyte are reduced and then interdiffuse with metal cathode overlayers, forming a miscible ZrM alloy interlayer. The interface restructuring degree follows the sequence of Au|YSZ|Au > Ni|YSZ|Au > Ag|YSZ|Au. Meanwhile, surface segregation of Zr on the cathode surface is also observed, whose degree follows the sequence of Ag|YSZ|Au > Ni|YSZ|Au > Au|YSZ|Au. Notably, the strong ZrM alloy formation enhances the interface restructuring but suppresses the Zr surface segregation. This work provides a fundamental understanding of the interfacial reaction at the buried electrode/electrolyte interface.

Grazing-incidence synchrotron radiation diffraction studies on irradiated Ce-doped and pristine Y-stabilized ZrO2 at the Rossendorf beamline.

In this work, Ce-doped yttria-stabilized zirconia (YSZ) and pure YSZ phases were subjected to irradiation with 14 MeV Au ions. Irradiation studies were performed to simulate long-term structural and microstructural damage due to self-irradiation in YSZ phases hosting alpha-active radioactive species. It was found that both the Ce-doped YSZ and the YSZ phases had a reasonable tolerance to irradiation at high ion fluences and the bulk crystallinity was well preserved. Nevertheless, local microstrain increased in all compounds under study after irradiation, with the Ce-doped phases being less affected than pure YSZ. Doping with cerium ions increased the microstructural stability of YSZ phases through a possible reduction in the mobility of oxygen atoms, which limits the formation of structural defects. Doping of YSZ with tetravalent actinide elements is expected to have a similar effect. Thus, YSZ phases are promising for the safe long-term storage of radioactive elements. Using synchrotron radiation diffraction, measurements of the thin irradiated layers of the Ce-YSZ and YSZ samples were performed in grazing incidence (GI) mode. A corresponding module for measurements in GI mode was developed at the Rossendorf Beamline and relevant technical details for sample alignment and data collection are also presented.

СРАВНИТЕЛЬНЫЙ АНАЛИЗ ИТТРИЙСОДЕРЖАЩИХ БЛОКОВ ДИОКСИДА ЦИРКОНИЯ

The aim of this review is to determine the positive and negative qualities and properties of zirconium dioxide blocks of different generations, namely 3Y-TZP, 5Y-TZP, 4Y-TZP. 
 Materials and methods. A systematic literature review in the electronic databases Google Scholar and Pubmed was conducted. The articles whose content was based on mechano-optical and physicochemical properties of zirconium dioxide blocks of 1, 3 and 4 generations and their application in practice were considered.
 Results: 57 articles were reviewed during the analysis, of which 47 from Pubmed and 10 from Google Scholar were selected. After selecting the articles according to the criteria, the total number of studies was 27. The studies evaluated the mechanical and optical properties of different generations of zirconia blocks.
 Conclusion: The use of yttrium-stabilized zirconium dioxide ceramics of different generations in dental practice provides opportunities to obtain quality results in the fabrication and placement of crowns, dentures, veneers and other prosthetic structures. Speaking about physical, mechanical and optical properties, it should be noted that each generation has different indicators. Specialists should be careful when choosing zirconium dioxide ceramics, as optical properties are not always a decisive factor when selecting a material for fabrication of fixed structures.

Repair of monolithic zirconia restorations with different direct resin composites: effect on the fatigue bonding and mechanical performance

ObjectiveThe study aims to evaluate the shear bond and flexural strength fatigue behavior of yttrium-stabilized zirconia (4YSZ) repaired using different resin composites.Materials and methodsCylindric specimens of 4YSZ were obtained for the bond strength (Ø = 6 mm, 1.5 mm of thickness) and biaxial flexural strength (Ø = 15 mm, 1 mm of thickness) fatigue tests and divided into 3 groups according to the repair resin composite: EVO (nanohybrid), BULK (bulk-fill), and FLOW (flowable). The zirconia surface was air-abraded with alumina particles, a 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) primer was applied, and the resin composite was build-up over the zirconia. Fatigue shear bond strength and flexural fatigue strength tests were performed (n = 15). One-way ANOVA and Tukey post hoc tests were carried out for both outcomes, besides scanning electron microscopy and finite element analysis.ResultsThe repair material affected the fatigue shear bond strength of zirconia ceramic. The BULK group (18.9 MPa) depicted higher bond strength values than FLOW (14.8 MPa) (p = 0.04), while EVO (18.0 MPa) showed similar results to both groups. No effect was observed for the mechanical behavior (p = 0.53). The stress distribution was similar for all groups.ConclusionThe repair of yttrium-stabilized zirconia (4YSZ) ceramics with bulk-fill resin composites was the best option for high fatigue bond strength. However, the fatigue mechanical performance was similar regardless of the applied repair material.Clinical relevanceThe repair of yttrium-stabilized zirconia (4YSZ) monolithic restorations may be performed with nanohybrid and bulk-fill resin composites in order to promote longevity in the treatment.