The preferred embodiment of the present invention provides novel and unique fused fibrous compounds for addition to and manufacture of bone and dental cement systems and methods of making the same. The preferred embodiment of the fused fibrous compound material made therefrom comprises a rigid three-dimensional network of fibers fused together at their points of contact wherein said network is greater than 60% by volume void space, has mean pore diameters greater than 10 microns, or both. The fused fibrous compound is preferably manufactured from fibers and a fusion source and is added to the composition in particle form.