Tough and strong Ce-TZP/Alumina nanocomposites doped with titania

Nawa, Masahiro; Nakamoto, Syoichi; Sekino, Tohru; Niihara, Koichi

doi:10.1016/s0272-8842(97)00048-5

Cited by 167 publications

(142 citation statements)

References 15 publications

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“…4 Creating a nanocomposite microstructure results in an even greater material toughness and strength. 5 Ce-TZP/A has been used as a load-bearing material in total joint replacement. 6 It is composed of zirconia with 10 mol% ceria and 30 vol% alumina.…”

Section: Discussionmentioning

confidence: 99%

Shear bond strength between veneering ceramics and ceria-stabilized zirconia/alumina

Fischer

Stawarczyk

Sailer

et al. 2010

The Journal of Prosthetic Dentistry

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Section: Discussionmentioning

confidence: 99%

Shear bond strength between veneering ceramics and ceria-stabilized zirconia/alumina

Fischer

Stawarczyk

Sailer

et al. 2010

The Journal of Prosthetic Dentistry

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“…After a separate determination of each phase, the grain sizes of Ce-TZP and Al2O3 were 0.59±0.09 µm and 0.42±0.08 µm Table 1 Average X-ray intensity ratios of oxygen, zirconium, yttrium, hafnium, aluminum, and cerium in the irradiated pits to the surface composition without irradiation respectively. A significant characteristic of the Ce-TZP/ Al2O3 nanocomposite lies in its intergranular nanostructure, whereby several 10−100 nm-sized Al2O3 particles are trapped within the ZrO2 grains and several 10 nm-sized ZrO2 particles are trapped within the Al2O3 grains 3,14) . After laser irradiation, the amount of aluminum in the irradiated black pits decreased significantly (Fig.…”

Section: Effect On Surface Changesmentioning

confidence: 99%

“…For improved mechanical strength, a ceriastabilized zirconia/alumina nanocomposite (Ce-TZP/ Al2O3 nanocomposite) was developed 3) . Previously, we demonstrated that, in comparison with Y-TZP, the Ce-TZP/Al2O3 nanocomposite exhibited a higher flexural strength and toughness, coupled with satisfactory durability, when exposed to low-temperature aging degradation in the various aqueous environments commonly encountered in dentistry [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Surface damages of zirconia by Nd:YAG dental laser irradiation

et al. 2010

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The purpose of this study was to characterize the surface damages of zirconia by Nd:YAG dental laser irradiation through a systematic evaluation of the associated microstructural changes. Disk specimens of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and ceria-stabilized zirconia/alumina nanocomposite (Ce-TZP/Al2O3 nanocomposite) were irradiated by Nd:YAG dental laser. The specimens were characterized using scanning electron microscopy, X-ray diffractometry, and wavelength dispersive X-ray spectroscopy. Every single irradiated spot was indicated by a circular black pit surrounded by a circular raised rim with a sunken depression at the center. On surface changes, many cracks were formed inside each irradiated pit. On changes in elemental composition, the concentration of oxygen decreased while that of zirconium increased. After heating in air, the assembly of circular black pits turned white, although the depression and raised rim remained. This study showed that Nd:YAG dental laser irradiation induced cracking and reduced oxygen content on the surface of zirconia. Consequently, these phenomena reduced the mechanical strength of zirconia. Therefore, Nd:YAG dental laser welding should not be performed on tetragonal zirconia.

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“…Ce-TZP itself shows high fracture toughness but low flexure strength [1]. The homogeneous dispersion of 30vol% nanoscale alumina in the Ce-TZP matrix increases the strength of the material without affecting the fracture toughness [2], which suggests the application of Ce-TZP/A as framework material for fixed dental restorations [3].…”

Section: Introductionmentioning

confidence: 99%

Impact of thermal properties of veneering ceramics on the fracture load of layered Ce-TZP/A nanocomposite frameworks

et al. 2009

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OBJECTIVES: The aim of this in vitro study was to assess the influence of thermal properties of veneering ceramics on the fracture load of layered ceria stabilized zirconia/alumina nanocomposite (Ce-TZP/A) single crowns. METHODS: Ce-TZP/A single crown frameworks (nanoZr) were veneered with 5 different veneering ceramics for zirconia (Cerabien ZR, IPS e.max, Triceram, Vintage ZR, VM9). In addition, veneering ceramics for alumina (Allux) and for the metal-ceramic technique (Reflex) were included in order to cover a wide range of coefficients of thermal expansion. Fracture load of the crowns was assessed in a shear test (n=10). Glass transition temperatures (T(g)) of the ceramics as well as the coefficients of thermal expansion of the ceramics (alpha(veneer)) and Ce-TZP/A (alpha(core)) between 25 and 500 degrees C were determined (n=6). RESULTS: Fracture load ranged from 574.0+/-97.1N (IPS e.max) to 1009.6+/-150.0N (VM9). Deltaalpha=alpha(core)-alpha(veneer) and DeltaT=T(g)-25 degrees C (DeltaT in K) were calculated. The fracture load was strongly correlated to Deltaalpha DeltaT with a maximum at Deltaalpha DeltaT approximately 580x10(-6). SIGNIFICANCE: The overall fracture load of veneered Ce-TZP/A crowns is correlated to the thermal properties of the respective veneering ceramic. Results. Fracture load ranged from 574.0±97.1N (IPS e.max) to 1009.6±150.0N (VM9). ∆α = α core -α veneer and ∆T = Tg-25°C (∆T in K) were calculated. The fracture load was strongly correlated to Δα·∆T with a maximum at Δα·∆T ≈ 580·10 -6 .Significance. The overall fracture load of veneered Ce-TZP/A crowns is correlated to the thermal properties of the respective veneering ceramic.

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Tough and strong Ce-TZP/Alumina nanocomposites doped with titania

Cited by 167 publications

References 15 publications

Shear bond strength between veneering ceramics and ceria-stabilized zirconia/alumina

Shear bond strength between veneering ceramics and ceria-stabilized zirconia/alumina

Surface damages of zirconia by Nd:YAG dental laser irradiation

Impact of thermal properties of veneering ceramics on the fracture load of layered Ce-TZP/A nanocomposite frameworks

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