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Synthesis and in vitro Bioactivity Mechanism of Synthetic α-wollastonite and β-wollastonite Bioceramics

R. Morsy, R. Abuelkhair, T. Elnimr

Journal of Ceramic Science and Technology, Vol. 7, No. 1 (2016), pp. 65-70

DOI: 10.4416/JCST2015-00028

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Abstract

Synthetic wollastonite ceramics have received great attention as promising bioceramics for enhancing the properties of bone substitutes. However, uncertainty remains about the differences in bioactivity between its phases, that is and , and about the mechanism for inducing bone-like hydroxyapatite (b-HAp). In the present study, and ceramics were prepared with the co-precipitation method. For the in vitro bioactivity test, and powders were soaked in simulated body fluid (SBF) solution for 1, 2, 3, 4, 10 days. Synthetic , and induced b-HAp particles were characterized by means of XRD, FT-IR, SEM and electron spin resonance (ESR). The results showed significant differences in the bioactivity between the and samples; the showed a significant increase in the rate of formation of b-HAp compared to that of . ESR data showed a high sensitivity to study the formation process of b-HAp, and confirmed the role of defects in bioactivity mechanism. The bioactivity mechanism was observed to involve a dissolution process of the wollastonite and formation process of the b-HAp. Therefore, these results describe the in vitro bioactivity differences between and powders, emphasizing the importance of controlling their bioactivity parameter for developing bone biocomposites.

Keywords

Bioceramics, wollastonite, hydroxyapatite, precipitation, electron resonance

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