Osseointegration aspects of placed plant in bone reconstruction ith newly developed block-type interconnected porous calcium hydroxyapatite

Artificial bone has been ennployed to reconstruct bone defects. However, only few reports on implant placennent after block bone grafting exist. Objectives: The purpose of this study was to evaluate the osseointegration of dental implant in bone reconstructions with interconnected porous calciunn hydroxyapatite (IP-CHA). Material and Methods: The IP-CHA cylinders (D; 4.3 mm, H; 10.0 mm) were placed into bone sockets in each side of the femurs of four male dogs. The IP-CHA on the right side was a 24-week sample. Twelve weeks after placement, a titanium implant was placed into a socket that was prepared in half of the placed IP-CHA cylinder on the right side. On the left side, another IP-CHA cylinder was placed as a 12-week sample. After another 12 weeks, the samples were harvested, and the bone regeneration and bone-implant contact (BIC) ratios were measured. Results: New bone formation area was superior in the 24-week IP-CHA compared with the 12-week IP-CHA. BIC was not significantly different between IP-CHA and the parent sites. Osseointegration was detected around the implant in IP-CHA-reconstructed bone. Conclusion: Our preliminary results suggest that IP-CHA nnay be a suitable bone graft material for reconstructing bones that require implant placement.