Fractography of self-glazed zirconia with improved reliability

Shen, Zhijian; Liu, Leifeng; Xu, Xiqing; Zhao, Jing; Eriksson, Mirva; Zhong, Yuan; Adolfsson, Erik; Liu, Yihong; Kocjan, Andraž

doi:10.1016/j.jeurceramsoc.2017.03.008

Cited by 46 publications

(34 citation statements)

References 28 publications

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“…In current case, the observed intragranular fracture behavior may be related to the disassembling of heavily deformed grains and/or mesocrystalline grains consisting of well assembled primary nano-sized crystallites. 18 The formed quasi-interfaces or subgrain boundaries due to the imperfect coalescence of nano-sized zirconia primary particles during sintering might appear as the aggregation of more line defects such as aggregated dislocations (Figure 3), which can provide a potential path for crack propagation and defection and thus consume more fracture energy. On the other hand, the formation of numerous coherent boundaries would further reinforced grain boundaries, contributing to frequent intragranular fracture of mesocrystalline grains with intragranular quasi-interfaces.…”

Section: Resultsmentioning

confidence: 99%

Ultrastrong tough zirconia ceramics by defects‐engineering

Zhu

Xie

2021

J Am Ceram Soc.

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We report the preparation of a category of ultrastrong tough zirconia ceramics by engineering defects using an oscillatory pressure during pressure assisted sintering. The introduced oscillatory pressure enhances the dynamic grain rearrangement, plastic deformation, mass transportation, and pore removal, leading to the formation of pore-free ceramics characterized by the rich coherent grain boundaries among individual mesocrystalline grains with intragranular quasiinterfaces. As a proof of concept, the pressure required by oscillatory pressure sintering (OPS) for preparing fully dense 3Y-TZP ceramics is significantly reduced, which is just ∼1/5 of that required by hot isostatic pressing. The OPS-prepared 3Y-TZP ceramics reached a record-breaking high bending strength and fracture toughness, being up to 1.8 GPa and 16 MPa⋅m 1/2 , respectively. This success illustrates a universal principle of engineering defects for making breakthrough in exploring other ultrastrong tough ceramics.

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Section: Resultsmentioning

confidence: 99%

Ultrastrong tough zirconia ceramics by defects‐engineering

Zhu

Xie

2021

J Am Ceram Soc.

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“…The as-sintered outer surface with fine grains and no milling defects showed obviously lower frictional coefficient against natural enamel than the milled zirconia 7) , and exhibits sufficient aesthetics 30,31) . Benefit from the dense and homogeneous microstructure with limited defects, the bending strength of self-glazed zirconia bulk is 1,120±70 MPa with a high Weibull modulus around 18 32) . No matter with and without subjecting to fatigue, the self-glazed zirconia bridge showed higher fracture force than the milled zirconia 24) .…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional fit of self-glazed zirconia monolithic crowns fabricated by wet deposition

Zhao

Sun

et al. 2022

Dent. Mater. J.

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This study evaluated the 3-dimensional (3D) fit of self-glazed zirconia monolithic crowns fabricated by wet deposition, in comparison with milled zirconia and lithium disilicate monolithic crowns. Dual-scan protocol was used to assess the fit of crowns. Root mean squares (RMS) and uniformity index (UI) were calculated to describe the gap size and uniformity. The self-glazed zirconia crowns had significantly lower RMS values for the gaps at axial wall and transition regions than the milled zirconia crowns, and for the gaps at occlusal region than both milled crowns. All 3 types of crowns had comparable RMS values for the gaps at marginal and chamfer regions and comparable UI values for both marginal and internal gaps. The 3D fit of the self-glazed zirconia monolithic crowns was clinically acceptable and they exhibited better fit at occlusal region than the milled crowns.

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“…The sample SZ is representative for a newly developed grade produced based on the wet-chemistry principle, during which the customised restorations are formed by a precision additive 3D gel deposition approach. In this way, the structural homogeneity of the formed bulk is improved while the residual stress as well as the local concentration of the packing defects are sufficiently reduced, which are beneficial to the removal of materials grain by grain thus to avoid the chipping of a group of grains in sintered bulks [20].…”

Section: Discussionmentioning

confidence: 99%

Grinding and polishing efficiency of a novel self-glazed zirconia versus the conventional dry-pressed and sintered zirconia ceramics

Alrayes

Zhao

Feng

et al. 2018

Advances in Applied Ceramics

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The grinding and polishing efficiency of self-glazed zirconia and Zenostar zirconia, prepared by wet and dry approaches, respectively, were evaluated. Each sample was divided into two subgroups (n = 5). One was ground, and the other was polished by following the clinical adjustment protocol. Statistics were analysed by independent t-test to a significance level of p < .05. More material was ground off in self-glazed zirconia than in Zenostar zirconia (p < .05) during the same period, especially during the coarse grinding procedure (p < .05), whereas the grinding efficiency in fine grinding stage was not significantly different (p > .05). The polishing efficiency of the whole and of the fine polishing procedure of the two kinds of zirconia was significantly different (p < .05). It thus can be concluded that grinding and polishing efficiency of a novel self-glazed zirconia is significantly higher than that of the conventional Zenostar zirconia. ARTICLE HISTORY

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Fractography of self-glazed zirconia with improved reliability

Cited by 46 publications

References 28 publications

Ultrastrong tough zirconia ceramics by defects‐engineering

Ultrastrong tough zirconia ceramics by defects‐engineering

Three-dimensional fit of self-glazed zirconia monolithic crowns fabricated by wet deposition

Grinding and polishing efficiency of a novel self-glazed zirconia versus the conventional dry-pressed and sintered zirconia ceramics

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