2:00 PM. 6. Effect of bioactive resorbable calcium-alkali-orthophosphate bone substitute cements on osteogenesis and bone regeneration of critical-size femoral defects in rabbits.Christine Knabe, PhD, DDS, DMD1, Georg Berger, PhD2, Renate Gildenhaar, PhD2, Alireza Houshmand, PhD, DDS, MD1, Christian Müller-Mai, PhD, MD3, Alina Bednarek, PhD, DDS1, Christian Koch, PhD, DVM1, Daniela Joern, MSc2, Michael Stiller, PhD, DDS, MD1 1Philipps-University Marburg, 2Federal Institute for Materials Research and Testing, 3Hopital for Special Surgery Luenen