Patent ID: 7109254

Claim:
A bone cement kit based on poly-methylmethacrylate comprising the following components provided separate of one another: a) 15 to 50% by weight, relative to the total weight of the bone cement, of a monomer-free polymethylmethacrylate (PMMA) whose average molar mass ranges between 3,000 and 200,000 daltons and whose acid value ranges between 10 and 350 mg KOH per g polymer; b) 10 to 40% by weight, relative to the total weight of the bone cement, of a biocompatible organic solvent or solvent mixture for the PMMA; and c) 0.05 to 80% by weight, relative to the total weight of the bone cement, of a bioactive, vitreous-crystalline material with a particle size ranging between >20 and 200 μm, the vitreous-crystalline material comprising: 15–45% by weight CaO, 40–45% by weight P 2O 5 , 10–40% by weight ZrO 2 and 0.7–3.5% by weight CaF 2 , relative to the total weight of the vitreous-crystalline material, and further comprising: apatite and calcium zirconium phosphate as main crystal phases and a glass phase as an auxiliary component, wherein said main crystal phases of the vitreous-crystalline material jointly making up at least 35% by weight and said auxiliary component making up 5 to 15% by weight.