Bioglass 45S5 doped with Bi2O3 for medical use

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Bioglass 45S5 was doped with bismuth oxide in concentrations up to 40 wt.%. The amorphous nature of the synthesized glasses was confirmed by X-ray phase analysis. The influence of Bi2O3 on the properties of bioglass was studied. In a series of samples containing from 0 to 40 wt.% bismuth oxide, their characteristics change as follows: the pH values of the model medium during glass leaching decrease from 7.84 to 7.46; radiopacity increases from 1150 HU to values exceeding 11000 HU; chemical degradation drops from 1.299% to 0.424%; bioactivity decreases in the range of 0 – 10 wt.% and is absent in the range of 20–40 wt.% Bi2O3. Glasses containing up to 10 wt.% Bi2O3 can find application in reconstructive surgery. They have radiopaque and bioactive properties. Glasses containing 20–40 wt.% Bi2O3 have high radiopacity, chemical resistance, and a slight effect on the pH of the medium when dissolved. They may be promising as radiomodifiers in the treatment of malignant neoplasms using radiation therapy.

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Sobre autores

D. Grishchenko

Institute of Chemistry, Far East Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: grishchenko@ich.dvo.ru
Rússia, Vladivostok, 690022

М. Medkov

Institute of Chemistry, Far East Branch of the Russian Academy of Sciences

Email: grishchenko@ich.dvo.ru
Rússia, Vladivostok, 690022

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2. Fig. 1. Diffraction pattern of a glass sample containing 40 wt.% Bi2O3

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3. Fig. 2. Photographs of samples doped with Bi2O3, wt. %: 5 (a), 10 (b), 20 (c), 40 (d)

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4. Fig. 3. Energy dispersive spectra of glasses doped with Bi2O3, wt. %: 5 (a), 10 (b), 20 (c), 40 (d)

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5. Fig. 4. Micrograph (a) and energy dispersive spectrum (b) of glass containing 5 wt.% Bi2O3 after being in SBF solution for 7 days.

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6. Fig. 5. Micrograph (a) and energy dispersive spectrum (b) of glass containing 5 wt.% Bi2O3 after being in SBF solution for 15 days.

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7. Fig. 6. Micrograph (a) and energy dispersive spectrum (b) of glass containing 10 wt.% Bi2O3 after being in SBF solution for 15 days.

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8. Fig. 7. pH values ​​of the model solution during degradation of Bioglass 45S5 glass doped with Bi2O3, wt. %: 0 (1), 5 (2), 10 (3), 20 (4), 40 (5)

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9. Fig. 8. Dependence of pH values ​​on chemical degradation of the sample in a model Tris solution

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