Binary biocomposites were realized by combining yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) with a bioactive glass matrix. Few works are available regarding composites containing zirconia and a relatively high content of glass because the resulting samples are usually biocompatible but not bioactive after thermal treatment. In the present research, the promising properties of the new BG_Ca–K glass, with its low tendency to crystallize and high apatite-forming ability, allowed us to sinter the composites at a relatively low temperature with excellent effects in terms of bioactivity. In addition, it was possible to benefit from the good mechanical behaviour of Y-TZP, thus obtaining samples with microhardness values that were among the highest reported in the literature. After a detailed analysis regarding the thermal behaviour of the composite powders, the sintered bodies were fully characterized by means of x-ray diffraction, SEM equipped with EDS, density measurements, volumetric shrinkage determination, mechanical testing and in vitro evaluation in a simulated body fluid (SBF) solution. According to the experimental results, the presence of Y-TZP improved the mechanical performance. Meanwhile, the BG_Ca–K glass, which mainly preserved its amorphous structure after sintering, provided the composites with a good apatite-forming ability in SBF.

Bioactive glass/ZrO2 composites for orthopaedic applications / Bellucci, Devis; Sola, Antonella; Cannillo, Valeria. - In: BIOMEDICAL MATERIALS. - ISSN 1748-6041. - STAMPA. - 9:(2014), pp. 015005-1-015005-12. [10.1088/1748-6041/9/1/015005]

Bioactive glass/ZrO2 composites for orthopaedic applications

BELLUCCI, Devis;SOLA, Antonella;CANNILLO, Valeria
2014

Abstract

Binary biocomposites were realized by combining yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) with a bioactive glass matrix. Few works are available regarding composites containing zirconia and a relatively high content of glass because the resulting samples are usually biocompatible but not bioactive after thermal treatment. In the present research, the promising properties of the new BG_Ca–K glass, with its low tendency to crystallize and high apatite-forming ability, allowed us to sinter the composites at a relatively low temperature with excellent effects in terms of bioactivity. In addition, it was possible to benefit from the good mechanical behaviour of Y-TZP, thus obtaining samples with microhardness values that were among the highest reported in the literature. After a detailed analysis regarding the thermal behaviour of the composite powders, the sintered bodies were fully characterized by means of x-ray diffraction, SEM equipped with EDS, density measurements, volumetric shrinkage determination, mechanical testing and in vitro evaluation in a simulated body fluid (SBF) solution. According to the experimental results, the presence of Y-TZP improved the mechanical performance. Meanwhile, the BG_Ca–K glass, which mainly preserved its amorphous structure after sintering, provided the composites with a good apatite-forming ability in SBF.
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015005-1
015005-12
Bioactive glass/ZrO2 composites for orthopaedic applications / Bellucci, Devis; Sola, Antonella; Cannillo, Valeria. - In: BIOMEDICAL MATERIALS. - ISSN 1748-6041. - STAMPA. - 9:(2014), pp. 015005-1-015005-12. [10.1088/1748-6041/9/1/015005]
Bellucci, Devis; Sola, Antonella; Cannillo, Valeria
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1019721
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