Induced bone by calcium ohosphate (Ca-P) ceramics after 2-years implantation

Abstract

The changes of induced bone with four kinds of Ca-P ceramics after 2 years implantation in the dorsal muscles of rabbits were investigated. After 2 years implantation, mature bone (with a lamellar structure after the remodeling process) with bone marrow was observed in HA1100 (HA, micro+macro porous), HA900 (HA, micro+macro porous) and BCP (HA/TCP=7:3, micro+ macro porous), and no bone formation was observed in HA1200 (HA, macro porous) ceramics. The induced bone neither disappeared nor grew uncontrollably, and was seen inside the pores of the implants or on the outer surface under the fibrous layer after 2 years. No bone formation was observed in the soft tissues distant from the implants. These results indicate that heterotopic bone formation induced by Ca-P materials did not give rise to uncontrolled growth over time, and the induced bone is limited to the inside or around the implants. Moreover, ectopic bone formation on the outer surface of the implants was detected in rabbits after 2 years.

Keywords

long-term / fate / bone formation / osteoinduction / ceramic

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