Abstract
A new type of bioactive glass-ceramic toughened by the dispersion of tetragonal zirconia polycrystal (TZP) grains was developed. This bioceramic exhibited high bending strength ( 500–800 MPa) and toughness. The high strength and toughness can be attributed to the inhibition of the crack propagation by deflection, branching and pinning, and the wastage of the fracture energy in propagating through TZP grains. It was shown that in composites containing TZP (especially up to 50 % vol.) a new apatite layer could form on the surface after immersion in simulated body fluid.
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