Ceramic filler compositions of customized shapes (FIGS. 1-30) according to the present invention, includes ceramic and glass-ceramic particles having a customized shape which provides mechanical locking within a resin matrix giving significantly improved fracture toughness performance for a resin/glass...http://www.google.com.au/patents/US7393883?utm_source=gb-gplus-sharePatent US7393883 - Filler for dental composite materials
