Nowadays bioactive glasses are frequently used for bone tissue replacements. In this work two new different calcium phosphate glasses were prepared and characterized. The chemical compositions were (in mol%): 11Na2O-44.5P2O5-44.5CaO (Bv11) and 6Na2O-44.5P2O5-44.5CaO-5TiO2(G5). Both materials were silanyzed and characterized by Differential Thermal Analysis (DTA), Transformed Fourier-Infrared Spectroscopy (FTIR) and Dilatometry. The bioglasses prepared were also used as filler of conventional polymethylmetacrylate (PMMA) bone cement and it's bioactive behavior explored by soaking composites in Simulated Body Fluid (SBF). The samples of modified cements exhibited significant morphological surface changes. Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray (EDX) and Field Emission-SEM (FE-SEM) analysis confirmed the formation of calcium phosphate precipitates on the surface of the cement. The amount of precipitates was higher for cements which contained Bv11 as filler than those loaded with G5 glass particles. These results revealed that the higher bioactivity of the cement load with Bv11 could be related with the higher solubility of this glass.