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  Mechanical properties of zirconia ceramics biomimetically coated with calcium deficient hydroxyapatite

Macan, J., Sikirić, M. D., Deluca, M., Bermejo, R., Baudin, C., Plodinec, M., et al. (2020). Mechanical properties of zirconia ceramics biomimetically coated with calcium deficient hydroxyapatite. Journal of the Mechanical Behavior of Biomedical Materials, 111: 104006. doi:10.1016/j.jmbbm.2020.104006.

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 Creators:
Macan, Jelena1, Author
Sikirić, Maja Dutour2, Author
Deluca, Marco3, Author
Bermejo, Raul4, Author
Baudin, Carmen5, Author
Plodinec, Milivoj5, 6, Author           
Salamon, Krešimir2, Author
Čeh, Miran7, Author
Gajović, Andreja2, Author
Affiliations:
1University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev trg 19, HR-10001, Zagreb, Croatia, ou_persistent22              
2Ruđer Bošković Institute, Bijenička 54, 10000, Zagreb, Croatia, ou_persistent22              
3Materials Center Leoben Forschung GmbH, Roseggerstraße 12, A-8700, Leoben, Austria, ou_persistent22              
4Institut für Struktur- und Funktionskeramik, Montanuniversitaet Leoben, Peter Tunner Straße 5, A-8700, Leoben, Austria, ou_persistent22              
5Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049, Madrid, Spain, ou_persistent22              
6Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
7Institute Jožef Stefan, Jamova 39, SI-1000, Ljubljana, Slovenia, ou_persistent22              

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Free keywords: Yttria stabilised zirconia Sol-gel process Calcium phosphates Metastable calcifying solution Mechanical properties
 Abstract: Mechanical properties and stability of porous tetragonal yttria-stabilised zirconia (Y-TZ) ceramics, biomimetically coated with calcium deficient hydroxyapatite (CaDHA) to obtain a bioactive material, were investigated. The 5.7 mol% yttria-stabilised tetragonal zirconia was obtained by sol-gel process and sintered at different temperatures to obtain a homogeneous and porous structure whose strength would match that of human bone. Sufficient strength was achieved by sintering at 1400 °C. The CaDHA coating was obtained at room temperature by a simplified preparation method consisting of immersion of the Y-TZ ceramics into a calcifying solution, after a short surface pretreatment in HCl. Although HAP or β-TCP are more frequently used, CaDHA was chosen due to its structural similarity to the bone mineral and ability to support bone ingrowth to a greater extent than biphasic calcium phosphates. To verify the applicability CaDHA coatings, we tested their adherence to Y-TZ ceramics for the first time to the best of our knowledge. Vickers hardness (3.8 ± 0.2 GPa) reflected the hardness of underlying ceramic. The tensile strength (269 ± 52 MPa) and Weibull modulus (5) of the obtained biomaterials matched or exceeded those of bone. There was no statistical difference in the tensile strength between the coated (269 ± 52 MPa) and the uncoated (239 ± 46 MPa) ceramics. The Y-TZ-CaDHA coating system presented adequate structural integrity under scratch test with critical load for coating cracking of 18 ± 2 N. These results indicate the potential of the prepared bioceramic to be used as bone implants.

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Language(s): eng - English
 Dates: 2020-07-172020-05-132020-07-212020-07-272020-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jmbbm.2020.104006
 Degree: -

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Title: Journal of the Mechanical Behavior of Biomedical Materials
  Abbreviation : J. Mech. Behav. Biomed. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 111 Sequence Number: 104006 Start / End Page: - Identifier: ISSN: 1751-6161
ISSN: 1878-0180
CoNE: https://pure.mpg.de/cone/journals/resource/1751-6161