𝔖 Bobbio Scriptorium
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Effect of crystallization on apatite-layer formation of bioactive glass 45S5

✍ Scribed by Filho, Oscar Peitl ;La Torre, Guy P. ;Hench, Larry L.

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
598 KB
Volume
30
Category
Article
ISSN
0021-9304

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✦ Synopsis

The bioactive glass 45S5 was crystallized to 8-100 vol % of crystals by thermal treatments from 550-680°C. The microstructure of the glass-ceramics had a very uniform crystal size, ranging from 8 to 20 pm. Fourier-transform infrared (!?TIR) spectroscopy was used to determine the rate of hydroxycarbonate apatite (HCA) formation that occurs on bioactive glass and glass-ceramic implants when exposed to simulated body fluid (SBF) solutions. Crystallization did not inhibit development of a crystalline HCA layer, but the onset time of crystallization increased from 10 h for the parent glass to 22 h for 100% crystallized glass-ceramic. The rate of surface reactions was slower when the percentage of crystallization was a 60%.

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