Highly-translucent, strong and aging-resistant 3Y-TZP ceramics for dental restoration by grain boundary segregation

Zhang, Fei; Vanmeensel, Kim; Batuk, Maria; Hadermann, Joke; Inokoshi, Masanao; Meerbeek, Bart Van; Naert, Ignace; Zhang, Fei

doi:10.1016/j.actbio.2015.01.037

Cited by 132 publications

(111 citation statements)

References 49 publications

(67 reference statements)

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“…A large trivalent dopant, oversized as compared to Zr4+, exhibiting strong segregation at the ZrO 2 grain boundary was preferred. The introduction of 0.2 mol% La 2 O 3 in conventional Al2O3 -doped 3Y-TZP resulted in an unique combination of high translucency (42% increase compared to conventional 0.25 wt.% alumina-doped 3Y-TZP) and superior hydrothermal stability (no transformation up to 120 h of hydrothermal aging at 134 _C), while maintaining excellent mechanical properties (22).…”

Section: Resultsmentioning

confidence: 99%

Sem analysis zirconia-ceramic adhesion interface

Cardelli¹

2015

ORL

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SUMMARYObjectives. Modern dentistry increasingly tends to use materials aesthetically acceptable and biomimetic. Among these are zirconia and ceramics for several years, a combination that now has becoming synonym of aesthetic; however, what could be the real link between these two materials and especially its nature, remains a controversial topic debated in the literature. The aim of our study was to "underline" the type of bonding that could exist between these materials. Materials and methods. To investigate the nature of this bond we used a SEM microscopy (Zeiss SUPRA 25). Different bilaminar specimens: "white" zirconia Zircodent® and ceramic "Noritake®", after being tested with loading test in bending (three-point-bending) and FEM analysis, were analyzed by SEM. Fragments' analysis in closeness of the fracture's point has allowed us to be able to "see" if at large magnifications between these two materials, and without the use of linear, could exist a lasting bond and the possible type of failure that could incur.Results. From our analysis of the specimens' fragments analyzed after test Equipment, it is difficult to highlight a clear margin and no-adhesion zones between the two materials, although the analysis involving fragments adjacent to the fracture that has taken place at the time of Mechanical test Equipment. Conclusions. According to our analysis and with all the clarification of the case, we can assume that you can obtain a long and lasting bond between the zirconia and ceramics. Agree to the data present in the literature, we can say that the type of bond varies according to the type of specimens and of course also the type of failure. In samples where the superstructure envelops the ceramic framework Zirconium we are in the presence of a cohesive failure, otherwise in a presence of adhesive failure.

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Section: Resultsmentioning

confidence: 99%

Sem analysis zirconia-ceramic adhesion interface

Cardelli¹

2015

ORL

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“…20 An additional approach that can be used is to replace tetragonal zirconia grains with optically isotropic cubic zirconia particles by increasing the yttria content to diminish the grain boundary light scattering to yield fully stabilized zirconia. 21 (iii) The third generation, 4-5Y-PSZ, incorporates more optically isotropic cubic zirconia (50-80%), has a grain size of 1 to 4 μm and is produced by increasing the Y 2 O 3 dopants to 4 to 5 mol% and increasing the sintering temperature and/or duration more than that of the second generation. However, cubic zirconia is weaker and more brittle than its tetragonal counterpart, which jeopardizes the strength of the zirconia.…”

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confidence: 99%

The influence of altering sintering protocols on the optical and mechanical properties of zirconia: A review

Ahmed

Troczynski

McCullagh

et al. 2019

J Esthet Restor Dent

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Objective As a result of advancements in chairside technology and speed sintering techniques and increased esthetic demands of patients, efforts have been made to produce monolithic zirconia restorations that are highly translucent, strong, and dense. While methods for processing zirconia are well known, there is a tendency to modify the process parameters with the aim of decreasing the overall processing time and, in particular, the sintering time. This review provides clinicians with scientific evidence of the effects of altering sintering parameters used for dental zirconia on its microstructure, phase transformation, and mechanical and optical properties. Materials and Methods A systematic search of Embase and Medline using Boolean operators was performed to locate relevant articles. Results Eleven articles were selected for this review. The following characteristics of monolithic zirconia have been confirmed to be affected by alterations in sintering: the microstructure, mechanical properties, optical properties, wear behavior, and low thermal degradation. Conclusions The alteration of sintering parameters has been found to alter the grain size, wear behavior, and translucency of zirconia. There is a lack of clinical studies that investigate the influence of altering sintering parameters or methods on the clinical performance of monolithic zirconia restorations. Clinical Significance Alteration of sintering parameters alters the microstructural, mechanical, and optical properties of zirconia. This will consequently impact the clinical performance of zirconia prostheses. Future clinical investigations are encouraged to support these in vitro findings.

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“…According to some studies, increasing grain size by changing the sintering conditions can also decrease the opacity of full-contour Y-TZP ceramics 4,15,16) . However, these larger grains would lead to the metastabilization of the grains and low temperature degradation (LTD) 17,18) . Radiopacity is a valuable property that allows the clinician to assess the adequacy of the restoration, distinguish secondary caries, and evaluate marginal adaptation, voids, and interfacial gaps [19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Comparative radiopacity of conventional and full-contour Y-TZP ceramics

et al. 2016

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The purpose of this study was to evaluate the radiopacity of different yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics used in the fabrication of fixed dental prostheses. Disk-shaped specimens (N=120, n=30 per group) were fabricated with thicknesses of 0.3, 0.5, and 1 mm from the following four Y-TZP ceramics: Cercon ht (Degudent) (CZ), Prettau (Zirkonzahn) (ZZ), Alliance (Kuraray Noritake Dental) (NA), and Ice Zirkon (Zirkonzahn) (ICE). The optical densities of each material were measured from radiographic images, and each material (N=1) were characterized by using XRD and SEM. The results were analyzed with oneway analysis of variance and the Tukey-Kramer test (α=0.05). In the case of the ICE and NA specimens, the radiopacity significantly differed with thickness (p<0.05). However, the radiopacities of 0.5-and 0.3-mm-thick CZ and ZZ specimens were not significantly different (p>0.05). Full-contour Y-TZP materials have higher radiopacities than those of the conventional Y-TZP materials in decreased thicknesses.

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Highly-translucent, strong and aging-resistant 3Y-TZP ceramics for dental restoration by grain boundary segregation

Cited by 132 publications

References 49 publications

Sem analysis zirconia-ceramic adhesion interface

Sem analysis zirconia-ceramic adhesion interface

The influence of altering sintering protocols on the optical and mechanical properties of zirconia: A review

Comparative radiopacity of conventional and full-contour Y-TZP ceramics

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