Objective: Structural ceramics based on tetragonal zirconia has been used in dentistry with the goal of building prosthetics infrastructures, starting from the machining of prefabricated blocks. However, it is known that this material can undergo aging in humid conditions, thus allowing them to revert to the monoclinic phase, potentially compromising their mechanical properties. The type and amount of stabilizing ions but also the morphology, the particle size distribution, and the structural characteristics of the powders are directly related to this phenomenon. Method: in this work different stabilizing ions (Ce and Y) have been tested to obtain nanosized tetragonal zirconia powders by Pechini (citrate) route. The obtained powders have been characterized in order to evaluate the effect of cerium and yttrium on their sinterability and mechanical properties. The powder characterization shows that the chosen synthesis method allows to obtain nanometric powders of tetragonal zirconia (P42/nmc) through the formation of solid solutions. Defined the optimal sinterization conditions choosing a two step sintering in order to obtain a nanostructured materials, aging test (134°C per 10 hrs in hydrothermal conditions) have been performed on the obtained samples to evaluate the low temperature degradation of zirconia due to the tetragonal-to monoclinic transformation. Result: After aging XRD confirms the presence in both powders of tetragonal solid solutions as main crystallographic phase Conclusion: taking into account that in literature aging at 134°C for 1 hrs is theoretically similar to 3-4 years in vivo, we can conclude that the synthesized powder have a good stability against Low Temperature Degradation (LTD).

Nanopowders of dental zirconia obtained by Pechini synthesis route / Bortolini, Sergio; Natali, Alfredo; Bondioli, Federica; Maziero Volpato, Ca; Fredel, Mc; Consolo, Ugo. - In: JOURNAL OF DENTAL RESEARCH. - ISSN 1544-0591. - ELETTRONICO. - Vol. 92, Special Issue A, 2395:(2013), pp. 167-167. (Intervento presentato al convegno IADR 91th General Session tenutosi a Seattle (WA) - USA nel March 20-23, 2013).

Nanopowders of dental zirconia obtained by Pechini synthesis route.

BORTOLINI, Sergio;NATALI, Alfredo;BONDIOLI, Federica;CONSOLO, Ugo
2013

Abstract

Objective: Structural ceramics based on tetragonal zirconia has been used in dentistry with the goal of building prosthetics infrastructures, starting from the machining of prefabricated blocks. However, it is known that this material can undergo aging in humid conditions, thus allowing them to revert to the monoclinic phase, potentially compromising their mechanical properties. The type and amount of stabilizing ions but also the morphology, the particle size distribution, and the structural characteristics of the powders are directly related to this phenomenon. Method: in this work different stabilizing ions (Ce and Y) have been tested to obtain nanosized tetragonal zirconia powders by Pechini (citrate) route. The obtained powders have been characterized in order to evaluate the effect of cerium and yttrium on their sinterability and mechanical properties. The powder characterization shows that the chosen synthesis method allows to obtain nanometric powders of tetragonal zirconia (P42/nmc) through the formation of solid solutions. Defined the optimal sinterization conditions choosing a two step sintering in order to obtain a nanostructured materials, aging test (134°C per 10 hrs in hydrothermal conditions) have been performed on the obtained samples to evaluate the low temperature degradation of zirconia due to the tetragonal-to monoclinic transformation. Result: After aging XRD confirms the presence in both powders of tetragonal solid solutions as main crystallographic phase Conclusion: taking into account that in literature aging at 134°C for 1 hrs is theoretically similar to 3-4 years in vivo, we can conclude that the synthesized powder have a good stability against Low Temperature Degradation (LTD).
2013
Vol. 92, Special Issue A, 2395
167
167
Bortolini, Sergio; Natali, Alfredo; Bondioli, Federica; Maziero Volpato, Ca; Fredel, Mc; Consolo, Ugo
Nanopowders of dental zirconia obtained by Pechini synthesis route / Bortolini, Sergio; Natali, Alfredo; Bondioli, Federica; Maziero Volpato, Ca; Fredel, Mc; Consolo, Ugo. - In: JOURNAL OF DENTAL RESEARCH. - ISSN 1544-0591. - ELETTRONICO. - Vol. 92, Special Issue A, 2395:(2013), pp. 167-167. (Intervento presentato al convegno IADR 91th General Session tenutosi a Seattle (WA) - USA nel March 20-23, 2013).
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/932090
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact