A review on the hydrothermal ageing behaviour of Y-TZP ceramics

Ramesh, S.; Lee, K.Y. Sara; Tan, C.Y.

doi:10.1016/j.ceramint.2018.08.216

Cited by 68 publications

(43 citation statements)

References 162 publications

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“…They are therefore the most promising materials for metal-free dental restorations; however, they also have some issues. Lowtemperature degradation (LTD), or "aging", is wellknown as the main issue for the long-term reliability of zirconia ceramics [5][6][7]9,11,12,[14][15][16][17][18]. Aging is the slow transformation of zirconia crystals from the tetragonal phase to the much more stable monoclinic phase in the absence of mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior and mechanical properties of machinable zirconia/mica composites

Taruta

Yamaguchi

Yamakami

et al. 2019

Journal of Asian Ceramic Societies

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In order to fabricate machinable zirconia ceramics for dental restorations, zirconia/mica composites were prepared by mixing zirconia and fine mica powders, compacting the powder mixtures and then conducting pressure-less sintering of green powder compacts. The composites containing 30-49 vol% mica reached approximately full density at 1150ºC. The sintering temperature was 150ºC lower than that of monolithic zirconia. The mica melted during firing at above 1000ºC and recrystallized during cooling. The melting of mica at above 1000ºC induced rearrangement of the zirconia particles and accelerated mass-transport of zirconia through the solution-precipitation, resulting in low-temperature sintering of zirconia. Dense composites containing 30-36 vol% mica were machinable using a drill made of hard metal, while those containing 49 vol% mica were sufficiently machinable with a conventional high-speed steel tool. The machinable composite containing 30 vol% mica had a bending strength of 552 MPa and a fracture toughness of 3.9 MPa•m°5.

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Section: Introductionmentioning

confidence: 99%

Sintering behavior and mechanical properties of machinable zirconia/mica composites

Taruta

Yamaguchi

Yamakami

et al. 2019

Journal of Asian Ceramic Societies

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“…Ramesh et al 13 stated that a small grain size is beneficial in suppressing hydrothermal aging induced t→m phase transformation of Y-TZP. It was found that if grain sizes were below 0.5 µm, the t→m phase transformation was suppressed.…”

Section: Discussionmentioning

confidence: 99%

“…However, the various processing condition to prepare the zirconia materials and the amount of yttria stabilizer added during powder preparation may affect the optimum grain size. 13 …”

Section: Discussionmentioning

confidence: 99%

“… 5 6 7 8 9 10 Increasing amount of Y 2 O 3 stabilizer tends to alter the phase structure from tetragonal to cubic phase resulting in increased translucency and improved hydrothermal aging resistance. 11 12 13 14 The amount of cubic crystal structures seems to have an effect on the microstructure of zirconia materials, 15 particularly mechanical properties. 14 Nowadays, the studies have reported that increasing amount of cubic phase in zirconia can improve translucency of cubic-containing zirconia compared to conventional zirconia.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study on hydrothermal degradation of cubic-containing translucent zirconia

Kengtanyakich

Peampring

2020

J Adv Prosthodont

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PURPOSE The aims of this study were to investigate mechanical properties and hydrothermal degradation behaviour of the cubic-containing translucent yttrium oxide stabilized tetragonal zirconia polycrystal (Y-TZP). MATERIALS AND METHODS Four groups of Y-TZP (T, ST, XT, and P), containing different amount of cubic crystal, were examined. Specimens were aged by autoclaving at 122℃ under 2 bar pressure for 8 h. Phase transformation was analyzed using X-ray diffraction (XRD) to measure phase transformation (t→m). Kruskal-Wallis test was used to determine the difference. Surface hardness, biaxial flexural strength, and fracture toughness in values among the experimental groups and verified with Wilcoxon matched pairs test for hardness values and Mann Whitney U for flexural strength and fracture toughness. RESULTS XRD analysis showed no monoclinic phase in XT and P after aging. Only Group T showed statistically significant decreases in hardness after aging. Hydrothermal aging showed a significant decrease in flexural strength and fracture toughness in group T and ST, while group XT and P showed no effect of aging on fractural strength and fracture toughness with P <.05. CONCLUSION Hydrothermal aging caused reduction in mechanical properties such as surface hardness, biaxial flexural strength, and fracture toughness of Y-TZP zirconia. However, cubic-containing zirconia (more than 30% by volume of cubic crystal) was assumed to have high resistance to hydrothermal degradation. Clinical significance: Cubic-containing zirconia could withstand the intraoral aging condition. It could be suggested to use as a material for fabrication of esthetic dental restoration.

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“…Another alternative process is to use coatings on the zirconia surface [13][14][15]. The creation of alternative production processes requires the elucidation of the factors that induce degradation of ceramics (e.g., critical grain size and content of stabilizing agents in zirconia), and the determination of the stress component that takes place during the transformation of the crystal structure [16,17].…”

Section: Introductionmentioning

confidence: 99%

Novel process for the production of 3Y-TZP ceramics: comparison between ageing in artificial saliva and accelerated ageing

Aragón-Duarte

Bernal

Reyes‐Rojas

et al. 2020

Mater. Res. Express

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The degradation of tetragonal zirconia polycrystalline (3Y-TZP) ceramics prepared by a novel film growth technique, and by sintering at 1400°C, was evaluated for one year using two processes: (i) degradation under oral conditions in artificial saliva (37°C and pH 6.8) and (ii) accelerated degradation by autoclaving at 134°C at 0.2 MPa of pressure. X-ray diffraction analysis of 3Y-TZP ceramics sintered at 1400°C showed a phase transformation (tetragonal to monoclinic) in 3Y-TZP ceramics after the fifth month in artificial saliva. After 12 months in artificial saliva, there was ∼11% of monoclinic phase present in 3Y-TZP ceramics, but only ∼2% of monoclinic phase in samples that were subjected to accelerated degradation for 5 h. No correlation was found between the level of ageing during accelerated degradation and degradation in artificial saliva. There was no degradation of 3Y-TZP ceramics prepared by a novel film growth technique, independently of the degradation method used, which suggests that this material could be used for dental prosthetics.

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A review on the hydrothermal ageing behaviour of Y-TZP ceramics

Cited by 68 publications

References 162 publications

Sintering behavior and mechanical properties of machinable zirconia/mica composites

Sintering behavior and mechanical properties of machinable zirconia/mica composites

An experimental study on hydrothermal degradation of cubic-containing translucent zirconia

Novel process for the production of 3Y-TZP ceramics: comparison between ageing in artificial saliva and accelerated ageing

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