NDLI: Conversion of melt-derived microfibrous borate (13-93B3) and silicate (45S5) bioactive glass in a simulated body fluid

Content Provider	Springer Nature Link
Author	Liu, Xin Rahaman, Mohamed N. Day, Delbert E.
Copyright Year	2012
Abstract	Microfibrous bioactive glasses are showing a considerable capacity to heal soft tissue wounds, but little information is available on the mechanism of healing. In the present study, the conversion of microfibrous borate bioactive glass (diameter = 0.2–5 μm) with the composition designated 13-93B3 (5.5 Na$_{2}$O, 11.1 K$_{2}$O, 4.6 MgO, 18.5 CaO, 3.7 P$_{2}$O$_{5}$, 56.6 B$_{2}$O$_{3}$ wt%) was evaluated in vitro as a function of immersion time in a simulated body fluid (SBF) at 37 °C using structural and chemical techniques. Silicate 45S5glass microfibers (45 SiO$_{2}$, 24.5 Na$_{2}$O, 24.5 CaO, 6 P$_{2}$O$_{5}$ wt%) were also studied for comparison. Microfibrous 13-93B3 glass degraded almost completely and converted to a calcium phosphate material within 7–14 days in SBF, whereas >85 % of the silica remained in the 45S5 microfibers, forming a silica gel phase. An amorphous calcium phosphate (ACP) product that formed on the 13-93B3 microfibers crystallized at a slower rate to hydroxyapatite (HA) when compared to the ACP that formed on the 45S5 fibers. For immersion times >3 days, the 13-93B3 fibers released a higher concentration of Ca into the SBF than the 45S5 fibers. The fast and more complete degradation, slow crystallization of the ACP product, and higher concentration of dissolved Ca in SBF could contribute to the capacity of the microfibrous borate 13-93B3 glass to heal soft tissue wounds.
Starting Page	583
Ending Page	595
Page Count	13
File Format	PDF
ISSN	09574530
Journal	Journal of Materials Science: Materials in Medicine
Volume Number	24
Issue Number	3
e-ISSN	15734838
Language	English
Publisher	Springer US
Publisher Date	2012-12-12
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Biomaterials Polymer Sciences Ceramics, Glass, Composites, Natural Methods Metallic Materials Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biophysics Bioengineering Biomedical Engineering

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