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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728Evaluation of the Apatite Coating on Silicon...

Evaluation of the Apatite Coating on Silicon Nitride Based Ceramics Sintered with Re₂O₃ Additives (Re = Y, La, Yb)

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Abstract:

As alternative for alumina and zirconia implants, silicon nitride based ceramics are considered promising candidate due to its biocompatibility and mechanical properties. However, this materials exhibit a bioinert character, leading to clinical failures. To overcome this problem, a biomimetic coating of hydroxyapatite is proposed in this paper, so that the surface can be bioactive and, consequently, the osteointegration process can be enhanced. Silicon nitride samples were sintered with different additives (Y, La and Yb) and the surfaces before and after coating were characterized by diffuse reflectance infrared Fourier transformed (DRIFT), X ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the surfaces of bioinert silicon nitride samples sintered with different additives could be transformed into bioactive by the formation of a hydroxyapatite layer through biomimetic process.

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Advanced Powder Technology VIII

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Periodical:

Materials Science Forum (Volumes 727-728)

Pages:

1243-1248

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.727-728.1243

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Online since:

August 2012

Authors:

Juliana Marchi, Cecília Chaves Guedes e Silva, E.C.S. Rigo, Ana Helena de Almeida Bressiani, José Carlos Bressiani

Keywords:

Bioactive Surface, Biomimetic Coating, Silicon Nitride (Si₃N₄), Sintering Additives

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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