Quantitative phase analysis from X-ray diffraction in Y-TZP dental ceramics: A critical evaluation

Arata, Anelyse; Campos, Tiago Moreira Bastos; Machado, João Paulo Barros; Lazar, Dolores Ribeiro Ricci; Ussui, Valter; Lima, Nelson Batista de; Tango, Rubens Nisie

doi:10.1016/j.jdent.2014.08.010

Cited by 53 publications

(30 citation statements)

References 27 publications

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“…The specimens sintered at 60 minutes also presented low densities 26 that evaluated another commercial pre-sintered Y-TZP. 30 According to the results of density presented by Arata et al (2014Arata et al ( , 2015 2,27 the Y-TZP density after conventional sintering presented similar values compared with the microwave sintering at 1450°C in this present study. However, the VM-1350 specimen showed an evident intergranular residual porosity and smaller grain size (Figure 3).…”

Section: Discussionsupporting

confidence: 71%

“…For comparison purposes, one specimen of each ceramic was sintered in a conventional electrical box furnace (Lindberg/ Blue M, Asheville, NC, USA) at 1530°C for 2 hours. 2,27 The heating rates were at (a) microwave oven: 25°C/ min until 1000°C, 15°C/min until 1300°C, 5°C/min until 1450°C and (b) conventional furnace: 10°C/min until 800°C, 5°C/min until 1530°C and cooling at 25°C/min until room temperature.…”

Section: Sintering Protocolsmentioning

confidence: 99%

“…1 Metal free systems, such as 3 mol% yttria-tetragonal zirconia polycrystals (Y-TZP) ceramics, were introduced to the dentistry market due to the increasing demand for esthetic materials for restorative dentistry with high mechanical resistance, fracture toughness, and low wear associated with biocompatibility. [2][3][4][5] Zirconia in its pure state is a polymorphic crystal organized in three crystalline phases: monoclinic (stable from room temperature up to 1170°C), tetragonal (stable between 1170°C and 2370°C), and cubic (from 2370°C until its melting point). The addition of 2-3 mol% of yttria stabilizes the tetragonal phase at room temperature, preventing the | 2021 RIBEIRO Et al. catastrophic volumetric expansion caused by the tetragonal to monoclinic (t-m) phase transformation at the ceramic processing cooling stage.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of a laboratorial scale synthesized and a commercial yttria‐tetragonal zirconia polycrystals ceramics submitted to microwave sintering

Ribeiro

Arata

Lima

et al. 2019

Int J Applied Ceramic Tech

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Conventional sintering techniques of yttria‐tetragonal zirconia polycrystals (Y‐TZP) ceramics have presented limitations regarding the sintering time and temperature, increasing the cost of the final dental and biomedical products. Herein, microwave sintering comes to be an interesting alternative by providing fast heating, high densification, and grain‐size control. The aim of this study was to compare the effect of microwave sintering of Y‐TZP dental ceramics prepared from a pre‐sintered commercial block and produced from powders synthesized in a laboratorial scale by the precipitation route. The synthetized and commercial discs were submitted to microwave sintering at 1450°C and 1350°C for 15, 30, and 60 minutes. Densification, fracture toughness, grain size, and crystalline phase quantification of the sintered groups were evaluated. Both synthetized and commercial groups sintered at 1450°C for 15 and 30 minutes showed the higher densification results (98% TD). XRD quantitative phase analysis indicates that samples present 89% tetragonal and 11% cubic phases, except for the group prepared from coprecipitated powders sintered at 1450°C for 30 minutes, that presented 79% and 21% of tetragonal and cubic phases. The microwave sintering at 1450°C allows hardness and fracture toughness values comparable to conventional sintering.

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Section: Discussionsupporting

confidence: 71%

Section: Sintering Protocolsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of a laboratorial scale synthesized and a commercial yttria‐tetragonal zirconia polycrystals ceramics submitted to microwave sintering

Ribeiro

Arata

Lima

et al. 2019

Int J Applied Ceramic Tech

Self Cite

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“…XRD spectra were collected from each sample over a 2 θ range between 15° and 70° with a step size of 0.05° and a count time of 4 s per step. Monoclinic phase content was quantified using the Garvie and Nicholson equation modified by Toraya …”

Section: Methodsmentioning

confidence: 99%

“…Monoclinic phase content was quantified using the Garvie and Nicholson equation modified by Toraya. 30 A profilometer (Surfcom 480A, Accretech, Tokyo, Japan) was used to measure surface roughness with a tracing length of 4.0 mm and a cut-off value of 0.8 mm. The arithmetic average roughness (R a ) and ten-point average roughness (R z ) of each material was calculated from a total of 15 points from all three specimens.…”

Section: Analyses Of Surface Characteristicsmentioning

confidence: 99%

A novel method of surface modification by electrochemical deoxidation: Effect on surface characteristics and initial bioactivity of zirconia

Liu

Hong

et al. 2016

J Biomed Mater Res

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The aim of this study was to investigate and compare the surface characteristics and initial bioactivity of ceria-stabilized zirconia/alumina nanocomposite (NANOZR) with those of yttria-stabilized zirconia (3Y-TZP) and pure titanium (CpTi) following the use of three surface modification methods; polishing, sandblasting/acid-etching (SB-E) and electrochemical deoxidation (ECD). Physical properties including surface morphology, chemical composition, X-ray diffraction, surface wettability, surface roughness, and hardness were measured. Osteoblast-like MC3T3-E1 cells were used to examine cell morphology and attachment to the surfaces of the materials. ECD treated NANOZR (NANOZR-E) showed a well-arranged, self-organized microporous surface structure with significantly low contact angles when compared with the other specimens (p < 0.05). NANOZR-E also demonstrated a slight decrease in monoclinic phase content (-4.4 wt %). The morphology and attachment of MC3T3-E1 cells on NANOZR-E were similar to those on polished and SBE-treated CpTi surfaces. Higher cell affinity was observed on NANOZR-E when compared with ECD treated 3Y-TZP. The findings of this study indicate the effectiveness of the novel technique, ECD, in the formation of a microporous surface on NANOZR when compared with both CpTi and 3Y-TZP. Moreover, this method also appears to improve the biological activity of NANOZR during the initial stage. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 2641-2652, 2017.

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Phase transformations in yttria-partly stabilized zirconia induced by dental polishing regimes

Wertz,

Berthold,

Flicker

et al. 2024

J Mater Sci

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The study examined how three polishing methods, using equipment from NTI CeraGlaze (NTI), Komet Dental (Komet), and EVE Diacera (EVE) and employing either wet or dry grinding, affect the texture (roughness) and phase composition of Y-PSZ dental crowns. Dental crowns made from VITA’s 3Y-/4Y-/5Y-partly stabilized zirconia (Y-PSZ; YZ-HT/ST/XT), utilizing a standard CAD/CAM process, underwent both wet or dry grinding and polishing. The effects of distinct polishing treatments on Y-PSZ surface phase content were investigated using X-ray diffraction (XRD) and Rietveld refinement, the grain size was measured by field emission scanning electron microscopy (FE-SEM), and confocal scanning laser microscopy (CLSM) was used to determine the surface roughness as the arithmetical mean height (Sa). To analyse the different mode of action, the components of the polishers were analysed using XRD, along with micro X-ray computer tomography (µXCT), FE-SEM, and CLSM for microstructural examination. The Komet and NTI polishing regimes reduced roughness significantly better than the EVE regime for the 3Y and all wet specimens, but caused a rhombohedral phase fraction. A possible explanation for this result is the overall finer structure of the EVE coarse polisher (abrasive particle size and content, texture density), which probably results in a lower force on the Y-PSZ surface. Therefore, the rhombohedral phase boundary would not be reached. Due to rhombohedral phase having larger volume expansion and shear than the monoclinic phase, it may result in enhanced transformation toughening or detrimental low-temperature degradation effects. Graphical abstract

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Quantitative phase analysis from X-ray diffraction in Y-TZP dental ceramics: A critical evaluation

Cited by 53 publications

References 27 publications

Comparison of a laboratorial scale synthesized and a commercial yttria‐tetragonal zirconia polycrystals ceramics submitted to microwave sintering

Comparison of a laboratorial scale synthesized and a commercial yttria‐tetragonal zirconia polycrystals ceramics submitted to microwave sintering

A novel method of surface modification by electrochemical deoxidation: Effect on surface characteristics and initial bioactivity of zirconia

Phase transformations in yttria-partly stabilized zirconia induced by dental polishing regimes

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