Relationships between fracture toughness, Y2O3 fraction and phases content in modern dental Yttria-doped zirconias

Belli, Renan; Hurle, Katrin; Schürrlein, Jana; Petschelt, Anselm; Werbach, Katharina; Peterlik, Herwig; Rabe, Torsten; Mieller, Björn; Lohbauer, Ulrich

doi:10.1016/j.jeurceramsoc.2021.08.003

Cited by 24 publications

(7 citation statements)

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“…Microstructural aspects, specifically grain size, have shown to affect the distribution of the stabilizer within the grains, in turn determining the tetragonal to monoclinic transformability, the property which confers the highest gain in toughening in yttria-stabilized zirconias [ 3 ]. Actually, using the phase content of the materials evaluated here sintered conventionally, including a 2 mol% Y 2 O 3 -stabilized zirconia, we established a power-law relationship between K Ic and the volume content of the t -phase [ 13 ]. That led to an inverse power-law relationship between K Ic and yttria content of the form K Ic ( x Y 2 O 3 ) = K I,0 e −λ x + K Ic,cubic , with λ = -1.102 mol% −1 , challenging the classic relationship of Lange [ 34 ] and agreeing rather to the trend seen by Masaki [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, even though values of strength and fracture toughness can be indicative of the phase composition in dental zirconias, as shown in Refs. [ 13 ] and [ 18 ], further evaluations on microstructural parameters (grain size and distribution) and phase content using scanning electron microscopy and X-ray diffraction, respectively, would be warranted for additional insights on more specific effects of speed-sintering relative to conventional sintering programs.…”

Section: Discussionmentioning

confidence: 99%

“…The materials to be evaluated in this study were selected based on the degree of stabilization with Y 2 O 3 so to encompass the range of conventional and translucent zirconias, i.e., 3 mol%, 4 mol%, or 5 mol% Y 2 O 3 . Two materials were selected per manufacturer; Table 1 summarizes their brand names, manufacturers, batches, and the quantification of Y 2 O 3 using X-Ray Fluorescence Spectroscopy and the phase content using X-Ray Diffraction and Rietveld refinement considering the existence of two tetragonal phases [13]. The foregoing of using a cubic phase structure for the fit in the Rietveld refinement is based on the low sensitivity of XRD to perturbations on the anion sub-lattice, leading to the appearance of cubic-like peaks [14][15][16][17] despite forbidden in < 8 mol% Y 2 O 3 compositions as demonstrated in selected-area diffraction in transmission electron microscopic studies revealing {112}-type reflections along the ❬111❭ zone axis [14,15].…”

Section: Methodsmentioning

confidence: 99%

“…Here, an alternative sintering program “speed-sintering” was evaluated, and compared to the “conventional sintering” program in terms of physical and mechanical properties as reported in Refs. [ 13 , 18 ]. Sintering was performed in a bottom-lift oven (Vita Zircomat 6000 M Speed, Vita Zahnfabrik) that allows flexible programming of the heating and cooling curves.…”

Section: Methodsmentioning

confidence: 99%

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Speed-sintering and the mechanical properties of 3–5 mol% Y2O3-stabilized zirconias

et al. 2023

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Ever faster workflows for the fabrication of all-ceramic restorations are of high economic interest. For that purpose, sintering protocols have been optimized for use in modern sintering furnaces, the so-called speed-sintering. However, conventional furnaces are still the most widely used equipment to sinter zirconia restorations. In this in-vitro study, we evaluated the feasibility of a speed-sintering protocol using a conventional sintering furnace to sinter different dental zirconias (stabilized with 3 mol% up to 5.4 mol% Y2O3) in comparison to a conventional sintering program. The properties evaluated were Young’s modulus, Poisson’s ratio, density, biaxial flexural strength, and fracture toughness. We show here that despite differences being dependent on material, the physical and mechanical properties of speed-sintered zirconia are comparable to those obtained by the conventional sintering.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Speed-sintering and the mechanical properties of 3–5 mol% Y2O3-stabilized zirconias

et al. 2023

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“…Adding 4 and 5 mol% of yttrium oxide (4Y-and 5Y-TZP) decreases the proportion of zirconium oxide crystals in the tetragonal phase, and the proportion of cubic crystals and grain sizes increases. Zirconium oxide becomes translucent and more aesthetic, but fracture toughness decreases [11]. These modern 4Y and 5Y-TZP zirconium oxide ceramics with color gradients in combination with coloring techniques and dental expertise allow for monolithic restorations that are aesthetically more than satisfactory [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Luting Materials on the Accuracy of Fit of Zirconia Copings: A Non-Destructive Digital Analysis Method

Berger,

Matta,

Weiß

et al. 2024

Materials

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The marginal accuracy of fit between prosthetic restorations and abutment teeth represents an essential aspect with regard to long-term clinical success. Since the final gap is also influenced by the luting techniques and materials applied, this study analyzed the accuracy of the fit of single-tooth zirconia copings before and after cementation using different luting materials. Forty plaster dies with a corresponding zirconia coping were manufactured based on a single tooth chamfer preparation. The copings were luted on the plaster dies (n = 10 per luting material) with a zinc phosphate (A), glass–ionomer (B), self-adhesive resin (C), or resin-modified glass–ionomer cement (D). The accuracy of fit for each coping was assessed using a non-destructive digital method. Intragroup statistical analysis was conducted using Wilcoxon signed rank tests and intergroup analysis by Kruskal–Wallis and Mann–Whitney U tests (α = 0.05). Accuracy of fit was significantly different before/after cementation within A (0.033/0.110 µm) and B (0.035/0.118 µm; p = 0.002). A had a significantly increased marginal gap compared to C and D, and B compared to C and D (p ≤ 0.001). Significantly increased vertical discrepancies between A and B versus C and D (p < 0.001) were assessed. Of the materials under investigation, the zinc phosphate cement led to increased vertical marginal discrepancies, whereas the self-adhesive resin cement did not influence the restoration fit.

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Instantiations of Multiscale Kinship in Pressing‐Defect Distributions in Yttria‐Stabilized Zirconias by Powder Partitioning

Pereira,

Lohbauer,

Schulbert

et al. 2024

Adv Eng Mater

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Modern dry‐pressing of ceramic powders using spray‐dried granulates cannot avoid the occurrence of defects related to persisting inter‐ and intra‐granulate interstitial voids. These constitute the parent defect size population limiting the application of polycrystalline ceramics in high‐stress conditions. The mitigation of such defects could widen the range of application in technical and biomedical engineering, reduce safe range for design and extend the lifetime of components. Here we use the Weibull size effect on strength in size‐partitioned YSZ feedstocks to explore the viability of changing the density distribution of granulate sizes as an effective strategy to obtain a denser particle packing that could reduce the size distribution of strength‐limiting pressing‐defects. In a direct assessment of critical defect size using multiscale strength testing with a dataset of ∽1300 values, we demonstrate here the success of such an approach in increasing the strength reliability for small volume components, but its ultimate failure in altering the defect size distribution in sintered YSZ ceramics across several length scales. We ultimately show that granule morphology (spherical or dimpled) fails to affect the defect density and size distribution in YSZ ceramics.This article is protected by copyright. All rights reserved.

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Relationships between fracture toughness, Y2O3 fraction and phases content in modern dental Yttria-doped zirconias

Cited by 24 publications

References 70 publications

Speed-sintering and the mechanical properties of 3–5 mol% Y2O3-stabilized zirconias

Speed-sintering and the mechanical properties of 3–5 mol% Y2O3-stabilized zirconias

Effect of Luting Materials on the Accuracy of Fit of Zirconia Copings: A Non-Destructive Digital Analysis Method

Instantiations of Multiscale Kinship in Pressing‐Defect Distributions in Yttria‐Stabilized Zirconias by Powder Partitioning

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