A composition comprises a glass ionomer cement and zinc phosphate. Preferably, the composition comprises from 40 to 95% by weight of glass ionomer cement and from 5 to 60% by weight of zinc phosphate. A composition is also provided that comprises a fluorosilicate glass and deactivated zinc oxide. Preferably, the composition comprises 40-95% by weight of fluorosilicate glass and 5-60% by weight of zinc oxide. The compositions are for use in the repair of human hard tissue, in particular as dental restorative materials and in orthopaedic surgery.
