Fabrication of Calcium Silicate Bioceramics and Study of Formation Mechanism by Solid-State NMR
Date Issued
2010
Date
2010
Author(s)
Tsai, Yu-Hsin
Abstract
Tricalcium silicate (C3S), a kind of calcium silicate bioceramics (CSCs) based on the CaO-SiO2 system, is the major component of dental cements used for endodontic restorative treatments. It should be non-toxic, and have high compatibility and good bioactivity.
Utilizing X-ray diffraction (XRD), scanning electron microscope (SEM), and solid-state nuclear magnetic resonance (NMR), we report the hydration behavior and properties of C3S prepared by sol-gel method. We found that the setting time of sol-gel C3S was reduced to 9 min which is significantly shorter than that of C3S prepared by the conventional melt-quench method. Samples of sol-gel C3S were hydrolyzed with distilled water, 10% Na3PO4, and 10% Na2CO3 solution. The hydration product of C3S mixed with the Na3PO4 solution has the best mechanical property. Interestingly, hydroxyapatite (HAp) is found in the hydration product of (C3S + Na3PO4) by solid-state NMR measurements. This finding may provide a practical approach to enhance the microhardness of cementious materials in general. On the other hand, the hydration product of C3S mixed with the Na2CO3 solution has the best biocompatibility. We find that the mechanical properties of these hydration products can be further enhanced by the addition of bioactive glasses. Overall, the materials developed in this work are well suited for root-end-filling therapy.
Subjects
bioceramics
tricalcium silicate
solid-state NMR
cement
calcium silicate hydrate
Type
thesis
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