Isothermal Tetragonal-to-Monoclinic Phase Transformation in a Zirconia&amp;ndash;Yttria System

Tsubakino, Harushige

doi:10.2320/matertrans.46.1443

Cited by 14 publications

(6 citation statements)

References 53 publications

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“…A linier relationship is observed for each temperature with a constant value of n equal to 2 and 1.5 in 3Y-TZP and 0.1 mol%SiO 2 -doped 3Y-TZP, respectively. These values of n between 1 and 2 are in good agreement with the previous results, 37) which corresponds to a nucleation and one-dimensional growth process. Figure 6 shows Arrenius plots of ln b in MAJ equation in 3Y-TZP and 0.1 mol%SiO 2 -doped 3Y-TZP.…”

Section: Resultssupporting

confidence: 81%

“…The values of the activation energy in both materials are in good agreement with the apparent activation energies obtained by transformation kinetics analysis or those for diffusion of oxygen ion reported in the previous studies, which are in a range between 60 and 113 kJ/mol. 17,37) In this result, the activation energy is not so different in the two materials. On the other hand, b 0 is different in one order in the two materials.…”

Section: Resultssupporting

confidence: 55%

“…Previous studies 17,37) have reported that the relationship between the amount of monoclinic phase and the aging time could be expressed by the Mehl-Avrami-Johnson (MAJ) equation which suggests nucleation and growth: 38) f ¼ 1 À exp½Àðb Á tÞ n ð 2Þ…”

Section: Resultsmentioning

confidence: 99%

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Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

et al. 2009

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The effect of small amount of insoluble dopant on tetragonal to monoclinic (t-m) phase transformation of 3 mol%Y 2 O 3 stabilized tetragonal zirconia polycrystal (3Y-TZP) is examined by ageing in hot water. The materials used are 3Y-TZP and 0.1 mol%SiO 2 -doped 3Y-TZP with grain size of 0.55 mm. The t-m phase transformation of 3Y-TZP is retarded by 0.1 mol%SiO 2 doping. Since the doped silicon ion segregates along the grain boundaries, the change in phase transformation behavior must be originated from the change in grain boundary diffusivity of hydroxyl ion. Analysis of the transformation kinetics by the Mehl-Avrami-Johnson equation reveals that the activation energy does not change in the two materials but the pre-exponential term significantly changes. Grain boundary diffusion of hydroxyl ion must be blocked by the presence of silicon ion which reduces the effective area of grain boundary diffusion.

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Section: Resultssupporting

confidence: 81%

Section: Resultssupporting

confidence: 55%

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Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

et al. 2009

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“…A study reported that the addition of alumina improved strength and fracture toughness by reducing anisotropy in the monoclinic phase 16) . Aluminatoughened zirconia (ATZ) and ceria-stabilized tetragonal zirconia polycrystals (Ce-TZP)/Al 2O3 (NanoZR) with alumina content of approximately 20 mass% has been reported to have high strength and fatigue durability, and these materials are used to manufacture implant materials 17,18) .…”

Section: Introductionmentioning

confidence: 99%

Low-temperature degradation of high-strength Y-TZP (yttria-stabilized tetragonal zirconia polycrystal)

et al. 2020

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The objective of this study was to investigate the low temperature degradation characteristics of 2 types of high strength yttriastabilized tetragonal zirconia polycrystal (Y-TZP) in order to evaluate its suitability for implant body, implant superstructure or abutment. Disk-shaped conventional Y-TZP (0.25 mass% alumina) subjected to hot isostatic press treatment (HIP-Y-TZP) and Y-TZP/4Al2O3 with additional alumina (4.0 mass%) were mirror-polished. Accelerated aging tests with 134°C for 5 h at 0.2 MPa and 180°C for 5 h at 1.0 MPa were performed using an autoclave. Biaxial flexural strength and crystal phases were evaluated. Strength decreased as the proportion of monoclinic phase increased after accelerated aging treatment for both types of high-strength Y-TZPs. Despite the low alumina content, HIP-Y-TZP showed higher static strength and strength after accelerated aging treatment compared to Y-TZP/4Al2O3. However, both types of Y-TZP had adequate strength to be used as dental restorations even after accelerated aging treatment, therefore, its clinical suitability was considered high.

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“…[8][9][10][11][12][13][14][15] Alumina, which is added to zirconia improve the mechanical properties and prevent low temperature degradation (LTD), is the most common impurity. [16][17][18][19][20][21][22] All-ceramic restorations with various resinbased adhesive systems are increasingly required in clinical dentistry, since they provide excellent esthetic metal-free characteristics. However, the physical and bonding properties of ceramics are problematic.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Aging on Microshear Bond Strength of Resin Cement to Monolithic Zirconia

Zohdy

Fadl

2017

Egyptian Dental Journal

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Purpose. Successful long-term bonding to zirconia ceramic remains a challenge, requiring special cements and treatments, which might negatively affect the ceramic. The purpose of this study was to evaluate the durability of micro-shear bond strength between resin cement containing phosphate monomer and zirconia ceramic submitted to different surface treatments before and after aging. Material and methods monolithic zirconia (Bruxzir Glidewell, California, USA) was selected as the substrate material. The ceramic surfaces, were either left untreated as-sintered (Group NT), silica coated with Rocatec soft system (3M/ESPE, USA) (Group CT), or treated with Alloy Primer (Kurary, Japan) (Group PR). They were bonded with a dual-cured resin cement; Panavia v5 (Kurary), using an adhesive system (Clearfil SE Bond). A micro-shear bond test was carried out to measure the bond strength of the resin cement to the zirconia surface. Samples were tested in a universal testing machine at a crosshead speed of 0.5 mm/minute before and after 90 days of water storage and 6000 thermal cycles (dwell time, 30 seconds). Statistical analysis was performed using a two-way ANOVA model, at p<0.05. SEM analysis was performed to detect failure type. Results. Mean microshear bond strength ranged from 14.39 to 21.59 MPa after 3 days and from 5.64 to 20.42 MPa after aging. Water storage and thermal cycling decreased bond strength significantly for NT and PR groups, while it had no significant effect on CT group. Early bond strength was highest with CT and PR groups with no significant difference between them, and they were both statistically significantly higher than NT group. SEM analysis showed an increase in interfacial adhesive failure after aging. Conclusions. Within the limitations of this study, it was concluded that silica coating and application of a chemical primer produced higher bond strengths to resin cement than leaving zirconia untreated. Aging significantly reduced the bond strengths for the untreated and primed zirconia, while silica coated zirconia remained stable and was not affected.

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Isothermal Tetragonal-to-Monoclinic Phase Transformation in a Zirconia–Yttria System

Cited by 14 publications

References 53 publications

Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

Low-temperature degradation of high-strength Y-TZP (yttria-stabilized tetragonal zirconia polycrystal)

The Effect of Aging on Microshear Bond Strength of Resin Cement to Monolithic Zirconia

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