Polymethylmetacrylate (PMMA) is one of the most widely used alloplastic material in surgery. Bioactive glass S53P4 (BAG) particles have been used in various clinical indications. BAG was added to composite implant of PMMA with glass fibre reinforcement to enhance bone ingrowth to implant, and to utilize BAG`s antimicrobial effects. Ten patients cranial defects are treated with composite implants.