Effect of stress-induced phase transformation on the properties of polycrystalline zirconia containing metastable tetragonal phase

Gupta, T. K.; Lange, F. F.; Bechtold, J.H.

doi:10.1007/bf00553200

Cited by 456 publications

(121 citation statements)

References 9 publications

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“…Zirconium dioxide (ZrO 2 , zirconia) presents the phenomenon of allotropy, characterized by temperature-dependent crystal structures [3]. When stabilizing the tetragonal phase at room temperature, the polymorphous character of zirconia allows for stress-induced phase transformation toughening (PTT) [4]. This involves the transformation of metastable tetragonal crystallites to the monoclinic phase in the crack tip stress field.…”

Section: Introductionmentioning

confidence: 99%

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

et al. 2017

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“…[1][2][3] Monoclinic zirconia exists below a temperature of 1170 C and is the weakest of the 3 allotropes. Tetragonal zirconia occurs within the range of 1170 C to 2370 C, while cubic zirconia is found at temperatures higher than 2370 C.…”

mentioning

confidence: 99%

“…Zirconia has high flexural strength and fracture toughness compared with other ceramics and can be used to replace metal frameworks in crowns and fixed dental prostheses. [1][2][3] Ahead of a crack tip, zirconia can undergo transformation toughening by transforming the tetragonal zirconia into monoclinic zirconia. Monoclinic zirconia is less dense than tetragonal zirconia because of a resultant expansion of approximately 4%.…”

mentioning

confidence: 99%

Effect of polishing procedures and hydrothermal aging on wear characteristics and phase transformation of zirconium dioxide

Bartolo

Cassar

Husain

et al. 2017

The Journal of Prosthetic Dentistry

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Statement of problem. Yttria-stabilized zirconia used for the fabrication of crowns and fixed\ud \ud prostheses may require intraoral adjustments after placement and cementation. Grinding and\ud \ud polishing methods may result in changes in the surface characteristics of zirconia.\ud \ud Purpose. The purpose of this in vitro study was to assess the effect of polishing procedures on\ud \ud surface roughness, topographical and phase changes of zirconia, and wear of the opposing dentition.\ud \ud Material and methods. Presintered and precut yttria-stabilized zirconia specimens (10×10×1 mm)\ud \ud were divided into 4 groups (control, Intensiv, Shofu, 3M ESPE) depending on the polishing method\ud \ud used to prepare the specimens. All tests were carried out in triplicate. The specimens were polished\ud \ud depending on the polishing regimen, while the control was left untreated. The specimens were\ud \ud thermocycled for 3000 cycles, with a temperature range of 5C to 55C. The surface roughness,\ud \ud elemental, and phase changes caused by polishing before and after thermocycling were assessed\ud \ud with surface profilometry, energy-dispersive spectroscopy, and X-ray diffraction analysis. The wear on\ud \ud antagonist steatite balls was also measured after mastication simulation. Statistical analysis was\ud \ud performed using 1-way ANOVA and the Tukey post hoc test to perform multiple comparison tests (a=.05).\ud \ud Results. The polishing procedures increased surface roughness (Ra) of yttria-stabilized zirconia from\ud \ud 0.52 for the control specimen to 0.73 for Intensiv, 0.70 for Shofu, and 0.70 for 3M ESPE (P<.05), which\ud \ud was reduced by thermocycling to 0.44 (control), 0.58 (Intensiv), and 0.58 (Shofu) (P<.001), while\ud \ud roughness remained unchanged for 3M ESPE specimens (0.75; P=.452). The deposition of aluminum\ud \ud when using Shofu abrasives and nickel in Intensiv was demonstrated. Phase changes were observed\ud \ud on the zirconia surface with formation of the monoclinic phase in all polishing methods. Specimen\ud \ud aging enhanced the surface phase changes and also induced compressive stresses in zirconia\ud \ud polished with Intensiv. The different polishing protocols did not affect the wear to the antagonist (P>.05).\ud \ud Conclusions. Polishing zirconia increased surface roughness and led to surface phase changes, but\ud \ud wear to the antagonist was not affected.peer-reviewe

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“…Currently the material of choice for ceramic oral implants is Y-TZP or Ce-TZP (ceria-stabilized TZP). Compared with alumina, Y-TZP has a higher bending strength, a lower modulus of elasticity and higher fracture toughness [9].…”

Section: Introductionmentioning

confidence: 99%

Zirconium Dental Implants And Crown for Congenitally Missing Maxillary Lateral; Clinical Case

Azzaldeen¹,

Georges²,

Nikos³

et al. 2017

IOSR JDMS

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Zirconia implants were familiarized into dental implantology. Zirconia appears to be an appropriate implant material due to its low plaque affinity, tooth like color, biocompatibility and mechanical properties. The following a case presentations will show how the acid-etched zirconia Implant can be used to functionally and aesthetically replace congenitally missing left lateral incisor tooth germ in the maxilla, and achieve optimal soft tissues and health.

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Effect of stress-induced phase transformation on the properties of polycrystalline zirconia containing metastable tetragonal phase

Cited by 456 publications

References 9 publications

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

Effect of polishing procedures and hydrothermal aging on wear characteristics and phase transformation of zirconium dioxide

Zirconium Dental Implants And Crown for Congenitally Missing Maxillary Lateral; Clinical Case

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