Vidrios biomédicos y vitrocerámicas como sustitutos de los tejidos óseos

Nowadays, an important research topic related with medical devices are the materials designed as bone tissues substitutes. Hard tissues have a great capacity of self-regeneration but in front of traumatic or pathologic critical bone defects it is necessary the use of bone substitutes or templates as temporal or permanent grafts. Glasses or glass-ceramics are osteoconductive, osteoinductive and biocompatible materials. In addition, they have the ability to link directly to the living bone tissues without any interface (bioactivity). Also, it has been reported that bioglasses favor the angiogenesis process and the cellular adhesion, proliferation and differentiation necessary features for bone tissue engineering scaffolds. This work refers generalities of the bioactive glasses and glass-ceramics compositions, manufacture processes, properties, advantages, disadvantages as well as the main clinical applications and new developments for tissue engineering

Effect of morphology and particle size on the mechanical properties of SAN composites

The effect of morphology (core-shell and three-layer) and particle size on the mechanical properties of a SAN composite was investigated. The-core-shell (CS) and three-layer (TL) particles with same global composition (60PBA/40PS) were both obtained by emulsion and microemulsion polymerization to obtain particles with different size. The composites with particles obtained by emulsion, independently of the morphology (CS or TL) and particle size (170 and 220 nm); have at maxima in impact resistance at a 20% of particles content. A different behaviour, however, was observed when particles obtained by microemulsion were used. The composites with TC particles obtained by microemulsion polymerization show a maximum in impact resistance at 10% particles, but impact resistance of composites with CS particles obtained by microemulsion polymerization did not show a maximum and increases with particles content