Mechanical properties and translucency of a multi-layered zirconia with color gradient for dental applications

Alves, Manuel Fellipe Rodrigues Pais; Abreu, Lais G.; Klippel, Gesinete Gonçalves Pinto; Santos, Claudinei dos; Strecker, Kurt

doi:10.1016/j.ceramint.2020.08.134

Cited by 22 publications

(8 citation statements)

References 38 publications

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“…Thus, within the sintering conditions employed in this study, the increase in the average grain size of the G3Y samples will not be prejudicial for the mechanical properties. As we have demonstrated in our recent publication 36 , working with the same compositional range of Fe 2 O 3 , the coloring additive did not have a significant impact in the microstructure of the ZrO 2 based ceramics. Based on this, only the SEM´s for the colored samples are showed in this manuscript.…”

Section: Microstructural Analysissupporting

confidence: 51%

Effect of Fe2O3 Addition and Sintering Temperature on mechanical Properties and Translucence of Zirconia Dental Ceramics with Different Y2O3 Content

et al. 2021

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The influence of Fe 2 O 3 additions on the microstructure, mechanical properties and translucence of zirconia with 3 mol-% or 5 mol-% Y 2 O 3 was evaluated. Samples were pressed with different thickness and sintered at 1475, 1500, 1550 and 1600°C for 2 h. Density, phases, microstructure, roughness, strength and translucency were analyzed. All samples showed densification greater than 99%. After sintering at 1600°C, the phase analysis revealed only tetragonal ZrO 2 in samples with 3% Y 2 O 3 , while in samples with 5% Y 2 O 3 the cubic ZrO 2 phase was identified. Significant increase in the grain size was noted, when increasing the Y 2 O 3 content from 3% to 5% from 0.8 µm to 2.3 µm for sintered samples at 1600°C. The strength was affected with Y 2 O 3 content and no relevant influence of the Fe 2 O 3 on density, microstructure or mechanical properties. Visible reflectance spectroscopy analyses, related to the CIELab scale, indicate variation in the contrast ratio as function of thickness of samples and coloring agent Fe 2 O 3 content.

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Section: Microstructural Analysissupporting

confidence: 51%

Effect of Fe2O3 Addition and Sintering Temperature on mechanical Properties and Translucence of Zirconia Dental Ceramics with Different Y2O3 Content

et al. 2021

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“…23 For example, increasing ferric oxide (Fe 2 O 3 ) led to a material's enhanced hardness and higher CR, with a simultaneous loss of translucency. 24 Zirconia colored with erbium and neodymium ions resulted in a decrease in flexural strength and fracture toughness. 25 On the other hand, some reported that there was no significant difference in translucency 21 and flexural strength of different layers.…”

Section: Introductionmentioning

confidence: 99%

Optical Characteristics of Monochrome and Multilayer Fully Stabilized Zirconia Upon Sintered Cooling Speed

Uasuwan

Juntavee

2023

Eur J Dent

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Objectives Firing protocols influence optical properties of dental ceramics. Effects of varying cooling rates of monochrome and multilayer 5 mol% yttria-stabilized tetragonal polycrystalline (5YTZP) on optical properties are subjected for investigation. Materials and Methods Ninety specimens (width, length, thickness = 10 × 20 × 2 mm) were prepared from monochrome (Mo: Cercon xt) and multilayer (Mu: Cercon xt ML with cervical (C) and incisal (I) zoning) 5YTZP. Specimens were sintered and randomly treated with three cooling rates (n = 15/group): slow (S: 5°C/min), normal (N: 35°C/min), and fast (F: 70°C/min). Color appearance (∆EW), color appearance difference (∆E diff), translucency parameter (TP), contrast ratio (CR), and opalescence parameter (OP) were evaluated in CIEL*a*b* (Commission International de I'Eclairage) system. ∆E diff was achieved from the coordinate difference of specimen to VITA classic shade A2. Microstructures and compositions were evaluated by scanning electron microscope and energy dispersive spectroscopy. Monoclinic (m), tetragonal (t), and cubic (c) phases were investigated with X-ray diffraction. Statistical Analysis An analysis of variance and Bonferroni multiple comparisons were determined for significant differences (p < 0.05). Results ΔEW of MoF was highest (66.04 ± 1.86), while MuN-I was lowest (62.60 ± 0.86). TP and OP of MoS were highest at 2.85 ± 0.11, and 2.25 ± 0.10, while MuF-I was lowest at 2.16 ± 0.10 and 1.60 ± 0.12. CR of MuF-I was highest (0.948 ± 0.005), while MoS was lowest (0.936 ± 0.005). ΔEdiff of MoF was highest (3.83), while MuN-I was lowest (0.93). Limited grain growth and m-phase composition were indicated upon fast cooling. There were significant differences for all color parameters due to varied materials, cooling rates, and their interactions (p < 0.05) except for interaction in ∆EW and OP. Conclusions Translucency of monochrome and multilayer 5YTZP were different, possibly due to colorant additives. Incisal layer of multilayer 5YTZP was perfectly matched with VITA shade. Increasing cooling speed resulted in smaller grain size, t-m transformation, and finally lower translucency and opalescence. Therefore, to achieve most favorable optical properties, slow cooling rate is recommended.

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“…Zirconia ceramics have become one of the widely concerned materials in the field of 5G communication and smart wearable devices due to high strength, no EMI (Electromagnetic Shielding), low sensitivity, strong corrosion resistance, wear resistance, and other comprehensive properties [ 1 , 2 , 3 , 4 ]. At the same time, the good biocompatibility also makes it have good application prospects in the field of medical repair [ 5 , 6 , 7 ]. However, due to the high hardness and fragility of zirconia ceramics, the traditional machining is difficult and often causes fragmentation and damage [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Injection Molding and Sintering of ZrO2 Ceramic Powder Modified by a Zirconate Coupling Agent

et al. 2022

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Ceramic injection molding is a near-net shape-processing technique, producing ceramic components with low tooling costs and complex shapes. In this paper, ZrO2 ceramics with high loading content in the green part were prepared by powder modification using zirconate coupling agent, injection molding and sintering, which benefited decreasing the usage of binders and deformation of ceramics. The rheological characteristics of feedstocks, densities, microstructures and mechanical properties of green and sintered parts with the different coupling media and sintering temperatures were studied. The results showed that the addition of a zirconate coupling agent with ethanol medium obviously increased the flowability of feedstocks and benefited achieving the green parts with high powder loading (86.5 wt.%) and bending strength (12.9 MPa) and the final unbroken ceramics. In addition, the sintering temperatures from 1500–1575 °C had no significant effects on the density, hardness, and surface morphology of the ceramic samples. However, the bending strength increased and some large grains with transgranular fracture occurred on the fractural surface at the sintering temperature of 1575 °C.

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Mechanical properties and translucency of a multi-layered zirconia with color gradient for dental applications

Cited by 22 publications

References 38 publications

Effect of Fe2O3 Addition and Sintering Temperature on mechanical Properties and Translucence of Zirconia Dental Ceramics with Different Y2O3 Content

Effect of Fe2O3 Addition and Sintering Temperature on mechanical Properties and Translucence of Zirconia Dental Ceramics with Different Y2O3 Content

Optical Characteristics of Monochrome and Multilayer Fully Stabilized Zirconia Upon Sintered Cooling Speed

Injection Molding and Sintering of ZrO2 Ceramic Powder Modified by a Zirconate Coupling Agent

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