Polarization of hybridized calcium phosphoaluminosilicates with 45S5-type bioglasses

Hybridization of biocompatible glasses was examined in order to produce fibrous bioactive glass. This work employed two kinds of calcium phosphoaluminosilicates (CPSA) and the 45S5-type bioactive glass. The choice of these parent glasses was based on both electric conductivity and fiber-forming ability. Electrical conductivity was an important property in relation to polarization, which has recently been proved an effective method for bioactivation of calcium phosphate ceramics. CPSA was developed by one of the authors (MK) for biocompatible fibers several decades ago. CPSA exhibited poor conductivity, while 45S5-type glass was conductive due to the high content of Na(+), which can be the charge carriers for conduction according to our previous work. The electrical improvement of CPSA glass was carried out through hybridization with 45S5. The glasses with Na(+)-rich composition failed to be transformed into fibers, whereas the glasses with appropriate sodium content were successfully made into fibers. The appropriate compositions were in the range of 1/99 to 10/90 as 45S5/CPSA in mass ratio.