In this study the inductive influence of hydroxyapatite ceramic (HAC) granules on preodontoblast differentiation was investigated. Dental papilla cells harvested from upper molar tooth germs were implanted intramuscularly in a pouch created for this purpose. Six months after surgery tooth-root-like bodies had developed with pulp-like cavities in the specimens in which dental papilla cells had been implanted with and without HAC. These bodies consisted of regular tubular dentine in the central part, fibrodentine peripherally and sometimes osteodentine VSports手机版. HAC was haphazardly enclosed in these root-like bodies, whereas the implantation of HAC alone had no effect. .