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Synthesis and in vitro Bioactivity Mechanism of Synthetic α-wollastonite and β-wollastonite Bioceramics
R. Morsy, R. Abuelkhair, T. Elnimr
Biophysics Lab, Physics Department, Faculty of Science. Tanta University, Tanta 31527, Egypt
received June 23, 2015, received in revised form August 26, 2015, accepted September 30, 2015
Vol. 7, No. 1, Pages 65-70 DOI: 10.4416/JCST2015-00028
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.
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Keywords
Bioceramics, wollastonite, hydroxyapatite, precipitation, electron resonance
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