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Bioactive glasses and glass¨Cceramics have anotherapplication in the field of biomaterials: the eliminationof cancerous cells in bones, by means of hyperthermia [12¨C15]. This therapy consists of the selective heating of a fixed zone. Above 431C the cancerous cells are the first to die when a heat treatment is applied. This occurs because less blood vessels and nervous ramifications arepresent in those zones and, therefore, they are less oxygenated. If the heat treatment is selective, that is,431C, and the application time is controlled, it could be possible to damage the cancerous cells without alteringthe healthy ones. The inclusion of magnetic aggregates in glasses or glass¨Cceramics of the system SiO2¨CCaO¨CP2O5 could be a solution for this application. On the one hand, it is possible to achieve the bonding of thebioactive glass and the bone and the growth of the latter, and on the other hand, it is possible to control theincrease of the temperature due to the hysteresis loop of the magnetic material and the induced eddy currentswhen a variable external magnetic field is applied. |
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